Day 1 :
Keynote Forum
Robert G. Driver
University of Alberta
Canada
Keynote: Rethinking the Evaluation of the Robustness of Steel Structures
Time : 10:00-10:30
Biography:
Robert Driver is Professor and Associate Chair of the Dept. of Civil and Environmental Engineering at the University of Alberta in Edmonton, Canada. He has a total of 30 years of experience in the steel fabrication industry, structural engineering consulting, applied engineering research, and education, having taught structural engineering undergraduate and post-graduate courses in Canada, the United States, and South Africa. He has received numerous awards for both research and teaching and is extensively involved in the development of structural design codes and standards in North America. He has published nearly 200 reports and papers in refereed journals and conference proceedings.
Abstract:
The foundational research used in current methods of evaluating the general robustness of steel buildings is still dominated by observations from the extensive studies over the last three decades of structures subjected to earthquake-type loading. While the main shortcomings of this approach have already been identified, this realisation has also revealed the urgent need for similar studies that are developed expressly for investigating collapse behaviour under localised damage scenarios. Several such research programs are already underway, but the understanding of generalised robustness criteria is still in its infancy. By far the most common type of connection in conventional steel buildings is the shear connection, although they take a variety of forms. As such, a thorough evaluation of the response and performance of various shear connection types is a critical component of the development of an overall understanding of how steel structures can be designed to mitigate the potential for progressive collapse.At the University of Alberta, tests of 72 full-scale steel shear connections with a variety of forms, both with and without a floor slab, have recently been completed under “column-removal” loading regimes. The tests evaluate most commonly-used shear connection types, including single and double angle, shear tab, and end plate connections. Complementary high-fidelity numerical modelling studies of these connections also incorporate tee shear connections. The overarching objective of this comprehensive research program is to provide new knowledge input for designing steel-framed buildings to minimise the possibility of progressive collapse scenarios occurring in the event of a column loss due to blast or another unanticipated localised trigger. Highly simplified connection models, validated via the physical test and numerical modelling data, are being developed that are much more accurate for characterising the behaviours of the various types of shear connections than those based on earthquake engineering research. These simplified models are appropriate for use in full-building analyses for making robustness assessments with confidence under a variety of potential progressive collapse circumstances.
Keynote Forum
Brian Uy
The University of New South Wales
Australia
Keynote: Next generation steel and composite infrastructure
Time : 10:50-11:20
Biography:
Brian Uy is Professor of Structural Engineering and Director of the Centre for Infrastructure Engineering and Safety (CIES) in the School of Civil and Environmental Engineering at The University of New South Wales in 2013. He has co-authored over 600 publications including over 150 journal articles. He has delivered over 250 conference papers in 35 countries, including over 50 keynote/invited lectures in 15 countries and has been involved in research in steel and composite structures for over 20 years. He is the Chairman of the Standards Australia Committee BD32 on Composite Structures. He has been the Chairman of the Australia Regional Group of the Institution of Structural Engineers since 2012 and the Chairman of the Australia Group of the International Association for Bridge and Structural Engineering (IABSE) since 2015. He is Chief Editor (Asia-Pacific) for Steel and Composite Structures. He currently serves on the American Institute of Steel Construction (AISC) Task Committee 5 on Composite Construction.
Abstract:
In this paper, steel and composite infrastructure are proposed as providing the most attractive opportunities in next generation infrastructure that promotes both demountability and structural health monitoring (SHM). This paper will provide an initial insight into the approaches that could be potentially used to ensure that SHM is further developed for next generation infrastructure. The paper will address what types of devices and information will need to be collected and how these can be integrated in Building Information Models (BIM) or Project Information Models (PIM).
Keynote Forum
M. Manikandan
Gulf Consult
Kuwait
Keynote: Ascertaining Key Risks in the Construction Projects from Stakeholder and Life Cycle Perspectives
Time : 11:20-11:50
Biography:
M.Manikandan is the Sr. Structural Engineer at Gulf Consult-Kuwait with responsibility for Designing and Construction Consultation of the tall buildings, Colleges, Shopping Complexes, Multi story Car Parks, Hospitals, Bridges and Deep Underground structures by considering the Structural requirements and adequate construct able systems to complete the projects within allocated budget and time schedule. Prior to joining Gulf Consult-Kuwait, he has worked as Structural Engineer at several companies, including RECAFCO-Kuwait, SAEED HADI ALDOOSARY EST-Saudi Arabia, Where he has completed many Precast Structures and treatment plant including the deep underground structures with heavy equipment. Notable he is in the construction industry since past 15 years and has completed many land mark projects in Kuwait as well in Saudi. He is pursuing PhD in Risk Management in International Construction Projects as an External Part time researcher with Vels University Chennai-India and expected completion on end of 2015 and He has been received Civil Engineering Degree from Kamraj University Madurai-India on April, 2000 following that he has received MBA in Project Management from Sikkim Manipal University-India in 2012.
Abstract:
Managing risks in construction projects has been recognized as a very important management process in order to achieve the project objectives in terms of time, cost, quality, safety and environmental sustainability. However, thus far most research has focused on some aspects of construction risk management rather than using a systematic and holistic approach to identify risks and analyze the likelihood of occurrence and impacts of the risks. This presentation aims to identify and analyze the risks associated with the development of construction projects from project stakeholder and life cycle perspectives. Based on a comprehensive assessment of the likelihood of occurrence and their impacts on various construction project objectives, this presentation identifies twenty major risk factors. This risks research is mainly related to (in ranking) contractors, clients and designers, with few related to government bodies, subcontractors/suppliers and external issues. Among them, “tight project schedule “is recognized to influence all project objectives extremely, whereas “design variations ”,“excessive approval procedures in administrative government departments”, “high performance/quality expectation”, “unsuitable construction program planning”, as well as “variations of construction program” are deemed to impact at least four aspects of project objectives. This research also found that these risks spread through the whole project life cycle and many risks occur at more than one phase, with the construction stage as the most risky phase, followed by the feasibility stage. This research would conclude that clients, designers and government bodies must work cooperatively from the feasibility phase onwards to address potential risks in time, and contractors and subcontractors with robust construction and management knowledge must be employed early to make sound preparation for carrying out safe, efficient and quality construction activities.
- Track 1: Construction Engineering
Track 2: Structures
Track 5: Civil Engineering
Location: Ballroom section 3
Chair
Brian Uy
The University of New South Wales, Australia
Co-Chair
AbdulQader S Al-Najmi
Jordan University School of Engineering, Jordan
Session Introduction
Brian Uy
University of New South Wales
Australia
Title: Next generation steel and composite infrastructure
Biography:
Brian Uy is Professor of Structural Engineering and Director of the Centre for Infrastructure Engineering and Safety (CIES) in the School of Civil and Environmental Engineering at The University of New South Wales in 2013. He has co-authored over 600 publications including over 150 journal articles. He has delivered over 250 conference papers in 35 countries, including over 50 keynote/invited lectures in 15 countries and has been involved in research in steel and composite structures for over 20 years. He is the Chairman of the Standards Australia Committee BD32 on Composite Structures. He has been the Chairman of the Australia Regional Group of the Institution of Structural Engineers since 2012 and the Chairman of the Australia Group of the International Association for Bridge and Structural Engineering (IABSE) since 2015. He is Chief Editor (Asia-Pacific) for Steel and Composite Structures. He currently serves on the American Institute of Steel Construction (AISC) Task Committee 5 on Composite Construction.
Abstract:
In this paper, steel and composite infrastructure are proposed as providing the most attractive opportunities in next generation infrastructure that promotes both demountability and structural health monitoring (SHM). This paper will provide an initial insight into the approaches that could be potentially used to ensure that SHM is further developed for next generation infrastructure. The paper will address what types of devices and information will need to be collected and how these can be integrated in Building Information Models (BIM) or Project Information Models (PIM).
Giovanni Carino
ProdigyAE Incorporated
Philippines
Title: Utilizing BIM in planning, budgeting and maintaining commercial projects
Biography:
Giovanni Carino attended Mapua Institute of Technology, College of Architecture and planning. Currently, he is the Chief BIM Consultant and Principal Architect of ProdigyAE1 Incorporated where he is responsible for Architectural Design Consultancy, Project Delivery and, Building Information Modeling initiatives. He also conducts lectures and trainings with various institutions in Asia, advocating BIM and Integrated Project Delivery adoption. While leading ProdigyAE Inc., he is credited for training several BIM teams from among the leading AEC companies in the Philippines in the proper procedures on creating and developing a Building Information Model, transitioning into a more effective BIM process and utilizing BIM on actual projects.
Abstract:
For almost 15 years after the era of Computer Aided-Drafting, technological advances in main-stream building design and construction have been slow until the emergence of Virtual Construction which was later known as Building Information Modeling. This took advantage of the advances technology in the areas of data embedding coupled with enhanced visualization allowing designers (both Architects & Engineers) the ability to more accurately plan, test and evaluate the built environment. The author will share experiences faced in actual projects and in actual companies that he and his team have developed and implemented BIM for – in property developers, design firms and construction companies focusing on commercial projects such as residential condominiums (high-rise, mid-rise), office buildings, retail centers and hospitality canters. Defining and simplifying BIM. What is BIM and what does it do? How relevant is it in the design and development sector? How about in construction? There are numerous definitions of what BIM is when you try to search the internet. Most are valid and a lot suggests it to be complicated. For our discussion however, we will attempt to realistically define BIM while establishing its relevance with our topic for design and construction in commercial properties. During the course the presentation, the author will share key information gathered through actual project experiences through different stages of delivering a commercial building/facility. We will review highlight projects that have utilized BIM and try to answer the following questions:
• What are the uses of BIM relevant to commercial properties particularly office buildings?
• How is it used in Planning?
• How does it help in Budgeting?
• How can it be utilized in Maintenance?
• What and where is its biggest impact based on experiences in Asia?
• What are the realistic barriers and challenges that users (from executive down to front-liners) encounter?
Finally, we’ll take a look at the potential future of BIM in the design and construction industry, how this will affect how developers create and deliver, operate and maintain commercial projects.
Juan C. Reyes
Universidad de los Andes
Colombia
Title: Estimating Seismic Demands for Performance-Based Engineering of Steel Buildings
Time : 12:00-12:20
Biography:
Juan C. Reyes has completed his Ph.D. at the age of 33 years from University of California, Berkeley. He is an associate professor and the director of the Civil and Environmental Engineering Laboratories at Universidad de los Andes, Colombia, a top South American university. He has published more than 10 papers in ISI indexed journals and is involved in various international associations and research groups.
Abstract:
Earthquake engineering practice is increasingly using performance-based procedures for evaluating existing buildings and proposed designs of new buildings. Both nonlinear static and nonlinear response history analyses (RHA) are used for estimating engineering demand parameters (EDPs) in performance-based engineering of steel buildings. Topics related to both analysis procedures are investigated in this paper. In the first part, the original modal pushover analysis (MPA) to estimate seismic demands due to one component of ground motion is extended to consider two horizontal components simultaneously in three-dimensional analysis of steel buildings. Subsequently, seismic demands are computed for six unsymmetric-plan steel buildings designed in accordance with the 1985 Uniform Building Code (UBC85) and the 2006 International Building Code (IBC06) due to 39 ground motions acting simultaneously in two orthogonal horizontal directions. Comparing these results with those from nonlinear RHA, we demonstrate that MPA provides good estimates of EDPs whereas the procedures specified in the ASCE/SEI 41-13 standard and the Eurocode 8 are not satisfactory for estimating seismic demands for unsymmetric-plan buildings. The second part of this paper concerns nonlinear response history analysis of buildings. With the goal of developing effective procedures for selection and scaling of multi-component ground motions to be used in nonlinear RHA, a modal-pushover-based-scaling (MPS) procedure is developed in this investigation. Based on the results for medium-rise symmetric-plan and unsymmetric-plan buildings with ductile steel frames, we demonstrate that the MPS procedure provides much superior results than the scaling procedure specified in the ASCE/SEI 7-10 standard.
AbdulQader S. Al-Najmi
University of Jordan
Jordan
Title: Towards the Design of Super Columns
Time : 12:20-12:40
Biography:
AbdulQader S. Al-Najmi has completed his PhD from the Victoria University of Manchester. He is currently professor of Civil Engineering at the University of Jordan. He has published more than 30 papers in reputed journals.
Abstract:
Tubular columns with welded U links to their walls and filled with concrete can sustain large loads. The axial capacity exceeds the sum of the yielding strength of the steel shell plus the crushing strength of concrete. The method of connecting the two structural materials brings the level of confinement of concrete to values never reached before. The concrete strength is increased by more than 100%. However the central result of this type of design, is the huge compressive strains attained; such strains are well outside the plastic strains of steel and exceeds 10 times the concrete crushing strain. The resulting integrity of the cross section goes beyond preventing local buckling of steel shell; to sustaining loads up to the failure which is characterized by the plastic buckling of the steel tube and not by the crushing of the concrete. Concrete does not fail; in fact the concrete deforms inside the buckled steel shell depicting its exact shape with no sign of any form of cracking in its final shape.
Mohamed Elchalakani
Dubai Men’s College
UAE
Title: CFRP Strengthening and Rehabilitation of Corroded Steel Pipelines under Direct Indentation
Time : 12:40-13:00
Biography:
Elchalakani holds Ph.D. from Monash University in structural engineering. He has been a civil engineering faculty at the Higher College of Technology (HCT) since August 2007. Dr Elchalakani has published over 60 peer reviewed technical papers on these topics. He has received several awards, including the Holman Medal and the Hunt Award for excellence in Research in Engineering in Melbourne Australia in 2004. He is Included in the 7th Edition of “Marquis Who’s Who in Science and Engineering.” He is also a registered professional engineer in Australia and a Registered Building Practitioner and also Registered in the National Professional Engineer Register in both Australia and Egypt.
Abstract:
To rehabilitate damaged or sub-standard steel pipelines, techniques using the lightweight, high strength and corrosion resistance of carbon fibres reinforced polymers (CFRP) composites have been proposed. This paper presents experimental results for two series of CFRP strengthened and rehabilitated pipes under quasi-static large deformation 3-point bending. The main parameters examined in this paper were the corrosion penetration in the wall thickness, and its extent along the pipe, and the type and number of the CFRP sheets. The corrosion was artificially induced 3600 around the circumference and in the wall thickness by machining where four different severity of corrosion were examined of 20% (mild), 40% (moderate), 60% (sever), and 80% (very sever). The first series was for rehabilitation of 31 artificially degraded pipes with limited corrosion repaired using externally wrapped sheets. The extent of corrosion along the pipeline was in the range of Lc/Dn=1.0 to 3.0, where Lc=length of corrosion and Dn is the nominal diameter of the pipe. The second series represents rehabilitation of 12 degraded pipes with full corrosion along the length of the pipe. The extent of corrosion along the pipeline in this series was Lc/Dn =8.0. The section slenderness examined in this paper was in the range of D0/t =20.32 to 93.6. The results show that the combined flexural and bearing strength of the pipe can be significantly increased by adhesively bonding CFRP. The percent increase in strength was mostly affected by the corrosion level where the maximum gain was 434% which was obtained for the most severe 80% corrosion in the wall thickness. The average increase in the load carrying capacity was 97% and 169% for the rehabilitation and strengthening series, respectively.
Wail N. Al-Rifaie
Philadelphia University
Jordan
Title: A step-by-step liberalized procedure for Ultimate Analysis of Space Structure
Biography:
Wail N. Al-Rifaie is the former President of University of Technology, Baghdad where holds a chair in the Building and Construction Engineering Department. He received his Ph.D in Structural Engineering from University of Wales, University College, Cardiff, U.K. in 1975. Professor Wail received the Telford Premium Prize from the Institution of Civil Engineers in 1976 on the strength of his doctoral work. He has been awarded numerous national honors including the Outstanding Professor Award (1996), the Science Merit Medal (2001) and the Science Decoration in the same year. He was a special professor at Nottingham University, UK in years 2008-2011. Professor Wail has supervised over 70 post graduate thesis and published over 110 scientific papers, the majority of which concern ferrocement elements, including membrane roof structures, box beams, load bearing walls and columns, hydraulic containment structures and thin shells such. He is the author of 7 Books in the field of Structural Analysis. Professor Al-Rifaie introduced a structural system for housing and emergency shelter using ferrocement as structural elements. Recently Prof. Al-Rifaie focusing on nano materials for construction
Abstract:
The simplest available theory for predicting the maximum load carrying capacity of steel frames is the simple (or rigid) plastic theory, and test results on adequately stabilized beams and single-story rigid frames have shown quite satisfactory agreement between the observed and predicted maximum loads. As in linear elastic analysis, simple plastic theory also presupposes that deformations have a negligible effect upon the equilibrium equations when formulated for the original unloaded shape of structures. The neglect of deformation moments in simple plastic theory can lead to an over-estimation of frame strength. The agreement between observed and calculated collapse loads in tests on frames of mild steel has been attributed to the compensating action of strain hardening and deformation moments, both of which are ignored in the simple plastic theory. Accepting that, the simple plastic theory for predicting the strength of steel frames has its limitations, the load factor for plastic failure (ï¬p ) as determined by this theory is still an important frame parameter, and for all structures except the simplest ones, the manual methods for computing (ï¬p ) can be tedious and requires, for a rapid solution, a considerable amount of work and intuition concerning the likely mode of failure. Once the generality of the matrix computer methods for linear elastic frame analysis had been recognized, it was natural to expect that attention would be concentrated on the various types of non-linear analysis. The theoretical work presented in this paper is an extension to the method developed by Al-Rifaie and Trikha for the elastic-plastic analysis of plane frame to deal with elastic-plastic analysis of space frame. The method is based on step-by-step linearized procedure based on displacement approach in which the members are assumed to possess infinite rigidity over the size of the connections at their ends for the elastic-plastic analysis of steel frames.
Jahid Zeghiche
University of Al-Baha
Saudi Arabia
Title: Compressive Strength of Concrete-filled thin steel stubs: Theoretical and experimental Study
Time : 13:40-14:00
Biography:
Jahid Zeghiche is an Associate Professor at Civil Engineering Department, University of Al-Baha, KSA. He was Head of Civil Eng. Dept. at Annaba University, Algeria since 1989 he teaches steel structures and conducted many research work in the field of composite steel and concrete columns. He published many articles in established journals. He supervised many Thesis for the degree of Master and Doctorate. He got a long experience in directing many Design Offices in the city of Annaba, Algeria. He is an active person to promote the use of composite structures to overcome many seismic problems in Algeria. He temporally teaches at Al-Baha University, since 2008.
Abstract:
This paper suggests a practical method for predicting the strength of thin steel and composite concrete-filled stubs under compressive loading. Based on predefined strengths of steel and concrete gathered from literature data survey, the strength of steel or composite stub section is evaluated as a function of B/T ratio of the studied section and the loading mode. The method was validated using experimental results obtained in this investigation and from literature. The main studied parameters were: the steel cross section slenderness B/T which varied from 20 to 100 and two loading modes: composite loading where steel and concrete are loaded and by loading concrete core. Ordinary steel and concrete were used. Good agreement was obtained between theoretical and experimental results. Composite stubs with composite loading mode had a global strength index close to 1. Which means better performance as the composite action delayed local buckling that took place in most tested empty steel stubs. Loading the concrete core gave more ductile behavior but lower strength. This is explained by the restraining feature offered by the steel wall which puts the concrete core in a tri-axial stress state. By comparing theoretical, experimental and EC prediction it was found that the EC3 ceases to predict at a B/T ratio of 33 for steel hollow stubs and 25 for I shaped steel stubs. EC4 prediction was in good agreement with theoretical and experimental results up to B/T ratio of 100 for composite stubs.
Beste Cubukcuoglu
Antalya International University
Turkey
Title: Eco-Con The environmental impact evaluation and testing of sustainable inorganic binders: A green alternative to ordinary Portland cement
Time : 14:00-14:20
Biography:
Beste Cubukcuoglu has completed her PhD in year 2012 at University of Surrey, UK. She is currently working at Antalya International University as the coordinator of Civil Engineering department ERASMUS exchange programme and full time Assistant Professor. She has written a number of papers, exhibited many posters and held a number of presentations about her research findings at various conferences worldwide. She has been serving as an editorial board member and experienced reviewer of many reputed journals.
Abstract:
Due to the current increase in environmental awareness and hence the need for sustainable development it is important to introduce more environmental and sustainable construction materials into the construction industry. Sustainable construction materials should not only be environmental friendly but also provide high level of safety and cost effectiveness over the long term. Sustainable construction materials should be proposed and introduced into the construction industry mostly to replace cement. Cement is one of the most commonly used construction materials with very high carbon emissions. Therefore, this study focuses on the sustainable alternative constituents to cement. Low grade magnesium oxide (LGMgO), pulverised fuel ash, steel slag and hydrated lime are the materials proposed as cement replacement. The physical and chemical characteristics of materials in discussion are investigated and the results are demonstrated in this study. Accordingly, LGMgO and steel slag are found to be an effective cement replacement materials at different ratios. LGMgO and steel slag both have similar hydration characteristics as cement. Strength development continues at longer curing ages and LGMgO is reactive enough when in contact with water to produce hydration reactions and products that are required for strength development. The compressive strength development of LGMgO and steel slag is promising that these materials can replace cement and be effectively used in many civil engineering applications. The findings highlighted the environmental and economic potential of replacing cement and other binding materials with LGMgO and steel slag.
Farid Abed
American University of Sharjah
UAE
Title: Buckling Capacity of Pretwisted Steel Columns; Experiments and Finite Element Study
Time : 14:20-14:40
Biography:
Farid Abed is Associate Professor of Civil Engineering at the American University of Sharjah, UAE. He earned his PhD in 2005 in Structures/Mechanics from Louisiana State University (LSU), USA. He taught for three years in the area of structures at Bradley University and LSU. He has more than four years of industrial experience working as a civil engineer in the Middle East. He has published more than 40 peer-reviewed articles and conference proceedings. His research interests include computational solids and structural mechanics, advanced structural analysis, advanced mechanics of materials, composite materials and nonlinear finite element analysis.
Abstract:
Buckling is a mode of failure that is mainly observed in compression members due to structural instability. Inducing a natural pretwist along the length of a column section makes the column have a different resistance at every point along its centroidal axis. A pretwisted column in 3D-space has its strong flexural plane weakened and its weak flexural plane strengthened, leading to a net favorable effect on the buckling strength of the pretwisted column. The proposed research focuses on studying the effect of pretwisting on the buckling capacity of steel columns. Experimental and numerical investigations of pretwisted steel columns with different slenderness ratios were carried out. Linear perturbation analysis was conducted for several universal column cross-sections for various lengths, a set of pretwisting angles ranging 0°-180° and different boundary conditions. A number of pretwisted columns was then tested to examine the elastic and inelastic behavior of one of the universal steel columns. The experimental results were utilized to verify and develop a set of non-linear finite element models including the material and geometric nonlinearities. The FE models were utilized to conduct a parametric study including several more lengths and twisting angles. It was found that pretwisting is most effective with elastic buckling since it is mainly controlled by the moment of inertia of the column in opposition to inelastic buckling which is additionally affected by material yielding. It was also noticed that fixed-ended conditions ensured better buckling capacity improvement as compared to pinned-ended columns in both elastic and inelastic zones.
Jahid Zeghiche
University of Al-Baha
Saudi Arabia
Title: Further Tests on Thin Steel and Composite Fabricated Stubs
Time : 14:40-15:00
Biography:
Jahid Zeghiche is an Associate Professor at Civil Engineering Department, University of Al-Baha, KSA. He was Head of Civil Eng. Dept. at Annaba University, Algeria since 1989 he teaches steel structures and conducted many research work in the field of composite steel and concrete columns. He published many articles in established journals. He supervised many Thesis for the degree of Master and Doctorate. He got a long experience in directing many Design Offices in the city of Annaba, Algeria. He is an active person to promote the use of composite structures to overcome many seismic problems in Algeria. He temporally teaches at Al-Baha University, since 2008.
Abstract:
Results of tests conducted on thin cold fabricated steel-concrete stubs are presented. The studied sections were made of two cold formed steel plates with U shape welded to form a steel box or an I shaped steel section. The steel cross section dimensions were: 100x70x2. mm. The main studied parameters were: the stub height, the welding fillet nature and its location, the steel cross section shape, the in-fill concrete and its age. A total of 48 stubs were tested, 22 empty and 26 filled with concrete that gravel made of crushed slag from blast furnace as natural gravel substitution. All failure loads were predicted numerically using ABACUS and by Euro codes EC3 and EC4 for steel and composite respectively. From test results it was confirmed that the discontinuous welding fillet for empty stubs had a drastic effect on the load carrying capacity and the failure mode was rather a premature local buckling mode. I shaped steel stubs had higher compression strength a lower load decrease rate compared to rectangular steel stubs. Providing rectangular steel stubs with continuous welding on mid-depth improved the load carrying capacity for rectangular empty steel and composite stubs. Meanwhile the age of concrete at 3 years enhanced considerably the performance of rectangular composite stubs with discontinuous welding. Both numerical and test results were in good agreement whereas EC3 and EC4 predictions were not conservative.
Ramesh Meghrajani
Visvesvaraya National Institute of Technology, Nagpur
India
Title: Buckling Load And Effective Length Of Web Tapered Built-Up Columns In Pre-Engineered Steel Buildings
Time : 15:00-15:20
Biography:
Ramesh Meghrajani is research scholar at V.N.I.T., Nagpur, India. Also he is the C.E.O of Neo Infraservices Pvt. Ltd., a structural consultancy organization in field of PEB buildings. .
Abstract:
Stability design requirements of structure and its elements emphasize to consider P-Δ and P-δ effects in structural analysis or use second order analysis. It is imperative for frames with web tapered built up columns, to assess for buckling load, Pcr. This paper presents two methods for calculation of buckling load, Pcr, for columns with web-tapered I-sections with both ends pinned and with one end fixed (base) while other free (top) having symmetric taper on both sides of vertical axis. This has been extended to columns with taper only on one side. These methods, namely buckling load factor method and effective length factor method, offer simple and direct equations. Equations are derived by analyzing results columns with various tapered columns and verified by SAP2000. Buckling load factors, Rppin and Rpfix are used for ratio of buckling load of tapered column to Euler buckling load of prismatic column with section properties at base respectively. Ri term is used for ratio of moment of inertia at top to moment of inertia at base. It is shown that buckling load factor is independent of height. Equation for relation between buckling load factors for fixed base case and pinned end case is also derived.
Magdi A. Khalifa
Abu Dhabi
United Arab Emirates
Title: Structural Steel Connection Design: between the Structural Consultant and the Steel Fabricator
Time : 15:20-15:40
Biography:
Magdi A. Khalifa received his Ph.D. in Structural Mechanics and Structural Engineering from the University of Southern California, USA, 1991. He has more than 30 years of experience in Structural Engineering and Structural Education . He just finished his term as an Associate Professor at Abu Dhabi University. Previously he served at University of Gezira-Sudan, California State University- Fresno, USA. United Arab Emirates University, Al-Ain, UAE, and University of Nebraska-Lincoln, USA. He had worked as the Design Manager at Cleveland Bridge & Engineering in Dubai. He also worked as Structural Engineer for consulting firms in California, Massachusetts, USA, UAE and Sudan.
Abstract:
The current common practice in structural steel industry is that the structural consultant analyzes the structure using the applicable load combinations and then size up the members for strength and serviceability. In most cases, the design of connections is left for the steel fabricator, who might be as well the erector of the structure. The connection design by the fabricator must be approved by the consultant after reviewing.Collaboration between the structural consultant and the steel fabricator/erector during the design process might facilitate and enhance the connection design process. Understanding the fabrication and the erection processes of the structure will allow the development of a structural system that can avoid certain types of connections. The type of the structure, its location with respect to the fabrication yard, the craneage capability, and the erection sequence may control the number and the type of connections required. Complicated connections increase the time and the cost of the fabrication as well as the erection process. In this paper, different steel connection issues will be presented and discussed. These issues are usually encountered in the design-fabrication-erection cycle of steel structures. Optimization of the process to avoid these issues will also be discussed.
Tariq Umar
A’Sharqiyah University
Oman
Title: Strength analysis of concrete (300/20) with super plasticizer
Biography:
Tariq Umar has completed his MSc at the age of 25 years from University of East London (UK) has postgraduate experience of more than six years involving different position in both academic and industry side. He is the programme leader of Civil Engineering programme at College of Engineering at A’Sharqiiyah University and also pursuing his PhD at School of Built Environment, London South Bank University.
Abstract:
Admixtures are used in concrete to obtain some specific properties to enhance the performance of concrete. In this research concrete of a specific grade (300/20) with a superplaticizer Ha Ba has been selected to enhance the reliability on the use of admixture in concreting. In the introduction part of the research properties of superplaticizer are discussed while later the technical data of Ha Be and result of different test on concrete are discussed. Initially materials / ingredients of concrete (300/20) are specified and correction for moisture have been made for 1 cum. A total of six design batches are selected to prepare a total of 36 cube of standard size (150mm x 150mm 150mm). To know the workability, the slump have been conducted at six stages i.e. initial, at 30 minutes, 45 minutes, 60 minutes, 75 minutes and at 90 minutes. The study shows that the concrete with the use of this specific superplasticizer (Ha Be) get the desired workability (slump value 150+25 mm) at 60 minutes, and it is concluded that such superplasticizer are recommended where transportation of concrete required 60 minutes. Since concrete gain a significant strength at seven days and remaining strength is gained at 28 day, therefore 18 cubes have been crushed at an age of 7 days, while remaining 18 have been crushed at an age of 28 days. These strength especially the 28th day strength (average value = 53 Mpa) has been compared with the required one (46 Mpa) and was found satisfactory. The densities of all the 36 cubes were also computed at two stages to compare it with the required density (2400 kg/m3). Both the calculated densities at 7 days for 18 cubes and at 28 days for 18 cubes was compared and found satisfactory. At the end it is concluded that if any superplasticizer is required to get some specific properties it can be use confidently since it not affected on the strength at all. Although since the research is only focusing on the strength at upto 28 days therefore it is also required to study the behavior of concrete at later stages to see there is any adverse effect in concrete due to the use of any superplasticizer.
Merve Sagiroglu
Erzurum Technical University
Turkey
Title: Evaluation of Connection Systems in Modular Constructions
Biography:
Merve Sağıroğlu is an Assistant Professor at Erzurum Technical University, Turkey. She received her Ph.D in Civil Engineering in 2013, from Atatürk University in Turkey. Currently, she is doing postdoctoral studies in the Architectural Engineering Department at Penn State University in the United States.
Abstract:
Modular buildings are developed as an alternative to conventional on-site construction because of more predictable costs and faster construction. While the use of modular buildings is increasing rapidly and this construction system is becoming more popular, research activities on structural components and materials used in modules, analysis and design methods and connection systems in the modular building are needed and are continuing. Modular construction aims to optimize the use of materials, while forming spaces comparable in size to conventional construction and to offer benefits of installation speed. The modules act as the primary structural system of the building, while another stabilization system such as stair or elevation core can be used as well. Modules transfer gravity loads and resist lateral loads through the module-to-module connections. Therefore, the connections must be strong enough and have inherent ductility to transfer loads from one module to another and accommodate building deformation under gravity and lateral loads.
The presentation will introduce commonly used connection systems in several types of modular construction. As modular systems are seldom used in high-rise building construction and because of limitations of structural and module-to-module connection systems, they are rather used in shorter than 7-8 stories. The presentation will explore the nature of these limitations and offer suggestion for improved structural-connection systems that provide desirable levels of strength, stiffness and ductility. In particular, the presentation discusses the possibility of using distributed isolation system as one option in such solution schemes.
Ahmed Ghallab
Ain Shams University
Egypt
Title: External prestressing, construction technique or rehabilitation method
Biography:
Ahmed Ghallab had graduated from Faculty of Engineering, Ain Shams University in 1991 and had MSc from the same University in 1995. He has completed his PhD from Leeds University, UK, 2001. He is a professor of concrete structures in Faculty of Engineering, Ain Shams University since 2013. He has published more than 28 papers in reputed journals and conferences and has been serving as a reviewer of many reputed journals. He is also a consultant engineer since 2010 and has designed several structures such as hospitals, stadium, factories, air ports.
Abstract:
External prestressing is an efficient method for constructing new structures such as bridges or for strengthening existing structures. However, each application needs different requirements. This paper discusses the components, types, advantages and disadvantages of external prestressing system relative to ordinary internal prestressing system. Also the requirements for using external prestressing in both applications.
Ezzeldin Yazeed Sayed-Ahmed
The American University in Cairo
Egypt
Title: Steel Girders with Corrugated Webs: Design Consideration
Biography:
Ezzeldin Yazeed Sayed-Ahmed has completed his Ph.D at the age of 30 years from the University of Calgary (Canada) and postdoctoral studies from the same university. He is a Professor of steel structures in the Ain Shams University and in the American University in Cairo. He is also a Reinforced Concrete and Steel Structures Consultant in Egypt. He has published more than 130 papers in reputed journals and conferences and served as an editor/reviewer for many others. He supervised to completion more than 25 PhD and MSc theses.
Abstract:
Steel girders with corrugated steel webs were lately emerged as a new structural system for bridges with multiple merits. The flanges of these girders provide the girder’s flexural strength with “almost†no contribution from the corrugated steel web which mainly provides the girder’s shear capacity. Failure of the corrugated web occurs by steel yielding, web buckling or interactively between both of them. Lateral torsion and local flange buckling of corrugated steel web girders present another two possible failure criteria for these girders. In this article, the work performed by the author on corrugated steel web girders is compiled and presented in a comprehensive format which leads to introducing full design procedures for such girders. The starting point is the shear behaviour of the corrugated steel webs which is investigated focusing on the failure modes affecting the web design. An interaction equation that considers web “local and global†buckling and steel yielding is proposed. Numerical analyses are performed to investigate the different buckling modes of the corrugated steel web, verify the validity of the proposed equation and explore the post-buckling strength of corrugated steel web girders. The numerical model is extended to determine the critical moment causing lateral instability for the corrugated steel web girders. The applicability of the critical moment design equations, currently used for plane web girders, to corrugated steel web ones is examined. The numerical model is then used to scrutinize the local buckling behaviour of the compression flange of corrugated steel web girders. The applicability of the currently used limiting values for the flange outstand-to-thickness ratios to corrugated web girders is investigated.
Galban Liber Rodriguez
Universidad de Oriente
Cuba
Title: Geological risks management and reduction procedure for santiago cuba province
Biography:
Liber Galbán Rodriguez has completed his Engineering Geology studies at the High Mining and Metallurgical Institute of Moa city in Cuba at the age of 22 years and Doctor in Geological Sciences from Universidad de Oriente (University of East), Santiago de Cuba, Cuba. He is the Auxiliary professor of Hydraulic Engineering Department, Constructions Faculty. He has published more than 20 papers in reputed journals and serving as an editorial board member, also published 5 scientific books in editorials from Spain, Croatia and the United States of America. He has received Cuban National Academy of Sciences prize in 2014 for his scientific results.
Abstract:
Geological processes and phenomena, such as earthquakes, landslides, erosion, carsificación, among others, are critical to engineering processes, due to its influence on the stability of the ground, respectively, in existing works, planned or construction (cities, buildings, bridges, dams, roads, tunnels, airports, mines, quarries, etc..). The possible occurrence of these constitutes a threat whose impact can lead to serious injury or geological risks. Santiago de Cuba Province due to seismicity, its mountainous relief, lithological composition and stratigraphic, tectonic conditions, hydrological and geotechnical, is regarded as the greatest potential geological hazards Cuba. The analysis of this province, notes that there are problems in the study geological engineer, land use, planning, organization, evaluation, management, analysis, implementation, monitoring and control of geological hazards in the territory, ie management problems exist. To resolve the problems raised in this research proposes a method for risk management and reduction geological Santiago de Cuba province. This procedure is supported by the theoretical foundations of process management, current approaches employing multidisciplinary criteria towards improving the actions aimed at the reduction and mitigation of geological risks.
Biography:
Yassin AL-Kour is a Senior Geotechnical Engineer in K&A Lebanon. He is the member of Professional Societies Order of Syrian Engineers (OSE), Member of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE), Syrian Soil of Mechanics Society (SSMS) and also Syrian Society of US Graduates (SSUSG).He has 25 years of experience in the geotechnical engineering domain.
Abstract:
The competition between steel and steel-reinforced concrete bridges can become very decisive when it comes to the specific prevailing geotechnical subsurface conditions and to the design criteria that can be adopted in designing a safely bridge foundation.Heavy concrete elements that come from a steel-reinforced concrete superstructure develop tremendous stresses which will, in turn, compress the soil underneath profoundly. This results in excessive settlement that, in most cases, the bridge superstructure cannot tolerate unless a super pile foundation design has been pursed. This paper will illustrate the real benefits of selecting light bridge superstructure for waterways and viaducts and finally highlight the sustainability and more economically efficient in the long run.Case history examples, when light weight steel bridge structures were favored over heavy steel concrete structure system, will be presented. This paper will conclude with recommendations and guidelines for structural bridge designers to use in their rules of preference when it comes to selecting the of bridge structural type for waterways and viaducts structural system.
Dipendu Bhunia
Birla Institute of Technology & Science, Pilani
India
Title: A Comparative Study between Mechanical and Physical Properties of Pozzolanic Concrete due to Effect of Carbonation
Biography:
Dipendu Bhunia is an Assistant Professor in Birla Institute of Technology and Science, Pilani Campus in the Department of Civil Engineering with his Bachelors and Masters Degree from Bengal Engineering College, Howrah, India. He received his PhD from Indian Institute of Technology, Roorkee in the year of 2010. He was visiting academic at Trinity College Dublin under ISCA Ireland-India Science foundation programme and University (abroad)-immersion programme, BITS Pilani from May to July 2014. His research interests include Performance based seismic design, Concrete technology and Energy efficient construction.
Abstract:
This paper deals with the accelerated carbonation of pozzolanic concrete for duration of 24 weeks. Carbonation of concrete, though considered a trouble for the steel reinforcement, there are no dearth in literature where the researchers have proved that it has greatly improved the mechanical properties of unreinforced concrete. For the present study, concrete with cement replaced by fly ash and ground granulated blast furnace slag are cured in an accelerated carbonation environment under controlled conditions of humidity and temperature for 24 weeks. The mechanical properties and durability are then studied and the results are compared with the standard concrete with no replacement. Mechanical properties that have been of keen interest are compressive strength, flexural strength and modulus of elasticity and durability tests comprised of depth of carbonation and permeable porosity. To comprehend the phase wise change of the value of pH and chemical kinetics of carbon dioxide ingress, tests are conducted for every 6 days of high CO2 exposure for 60 days.
Akchiche Mustapha
University of Science and Technology Houari Boumediene
Algeria
Title: Comparison of analytical, numerical and experimental test of pile behaviour under static cyclic vertical loading tests in layered elastic–plastic soils
Biography:
Akchiche Mustapha is the Research Director in Laboratory of Geotechnical Environment and Hydraulics (LEGHYD), Civil Engineering Faculty of University of Science and Technology Houari Boumediene as well as lecturer at the Faculty of Civil Engineering of University of Science and Technology Houari Boumediene. His research interest includes behavior of underground structures, rupture phenomena (strain localization, bifurcation) - Application to the stability of drilling, mechanical modeling of structures, Landslide, Rheology of soils (monotonic and cyclic loads, fatigue aspects), Deep foundations or piles, cyclic loading, soil reinforcement by vertical inclusions columns "soil mix", field tests and hydromechanical properties of soils.
Abstract:
The design of piled involves the identification of the essential parameters namely the number of piles, their diameter and the length along with Es value of the subsoil strata for an optimum design which can produce the required settlement reduction. The present study focused on a comparative study between static cyclic vertical loading tests scale on two piles of different lengths (in Layered elastic-plastic soil) using an finite element analysis to two dimensions (2D) using CESAR-LCPC as well as analytical methods. It was found that the 2D model is very effective for predicting the response of non-linear amplitude-frequency, given the non-linear phenomena of the complex soil-pile system in a layered medium.
Rajiv Gupta
Birla Institute of Technology & Science, Pilani
India
Title: Estimating project overruns due to common construction delays using Daily Productivity Impact Index
Biography:
Rajiv Gupta is Senior Professor of Civil Engineering, at BITS, Pilani. He has completed his B.E., M.E and Ph.D. from BITS, Pilani. In his last 28 years of teaching and research he has authored a number of books and course development material, published more than 125 research papers in renowned journals and presented papers in conferences in India and abroad. His fields of interest are GIS and RS, Concrete Technology and Construction Management and Energy- Water conservation. He is involved in number of projects of World Bank, UGC, DST and other sponsored organizations worth more than 300 lacs. In administration he has worked as warden, Head of departments, and Dean.
Abstract:
Analysis of the causes of delay in construction projects has been a subject of extensive research in the past. The quantification of their corresponding effect on construction productivity and progress of the project has also seen research in the form of multiple case studies. However, concrete and simple ways whereby planners, contractors and other stakeholders in a construction process can use this research to predict overruns in a construction project have not been developed. In this paper, the authors have developed a simulation model that uses input from the user, knowledge of common construction delays and their effect on productivity to generate an estimate the deviation of a construction project from its theoretically calculated duration. The same has been demonstrated by application to case studies, and the results thereby discussed which are matching with the actual duration of the project.
Akchiche Mustapha
University of Science and Technology Houari Boumediene
Algeria
Title: Comparison of analytical, numerical and experimental test of pile behaviour under static cyclic vertical loading tests in layered elastic–plastic soils
Biography:
Akchiche Mustapha is the Research Director in Laboratory of Geotechnical Environment and Hydraulics (LEGHYD), Civil Engineering Faculty of University of Science and Technology Houari Boumediene as well as lecturer at the Faculty of Civil Engineering of University of Science and Technology Houari Boumediene. His research interest includes behavior of underground structures, rupture phenomena (strain localization, bifurcation) - Application to the stability of drilling, mechanical modeling of structures, Landslide, Rheology of soils (monotonic and cyclic loads, fatigue aspects), Deep foundations or piles, cyclic loading, soil reinforcement by vertical inclusions columns "soil mix", field tests and hydromechanical properties of soils.
Abstract:
The design of piled involves the identification of the essential parameters namely the number of piles, their diameter and the length along with Es value of the subsoil strata for an optimum design which can produce the required settlement reduction. The present study focused on a comparative study between static cyclic vertical loading tests scale on two piles of different lengths (in Layered elastic-plastic soil) using an finite element analysis to two dimensions (2D) using CESAR-LCPC as well as analytical methods. It was found that the 2D model is very effective for predicting the response of non-linear amplitude-frequency, given the non-linear phenomena of the complex soil-pile system in a layered medium.
Abbas Al-Hdabi
University of Kufa
Iraq
Title: New Developments on Cold Bitumen Emulsion Mixtures Using Supplementary Cementitious Materials
Biography:
Abbas Al-Hdabi has completed his PhD at School of the Built Environment, Liverpool John Moores University, UK last year. He has published more than 20 scientific papers so far (9 journal papers, one book chapter and 13 conference papers). Ha is the managing editor of Kufa Journal of Engineering. He granted an Honourable Mention Award by the Association of British Turkish Academics (ABTA) in engineering category of the 2014 ABTA Doctoral Researcher Awards competition, May 2014.
Abstract:
Cold Bituminous Emulsion Mixtures (BEMs) means manufacturing of asphalt at ambient temperature using bitumen emulsion as the binder. It has been widely utilised in many countries such as the USA and France. The use and development of BEMs were not brought forward in the UK due to the country’s relatively wet/cold climatic conditions. The major problems with this kind of application are the long curing time required to achieve the necessary performance, the weak early life strength and high air voids content. The full curing in the field of these mixtures may occur between 2−24 months depending on the mixture’s ingredients and weather conditions. This paper reports the mechanical properties and durability of a new cold mix asphalt developed for use in highway and airfield pavement structural layers including surfacing. The filler in the traditional cold BEM under study i.e. 6% limestone dust by mass of aggregate is replaced with different supplementary cementitious materials individually and collectively. Stiffness modulus of cold BEM mixtures increases significantly by replacing the mineral filler with new filler materials, especially in the early curing time (less than 7 days), which is the main disadvantage of the cold BEMs. Also, the target stiffness modulus, which is the ITSM for 100/150 hot asphalt mixtures, was achieved after 4 hours for the produced fast-curing cold BEM under the normal curing method. In addition, this replacement greatly improves the permanent deformation resistance and fatigue life when compared with the control cold BEM and the traditional hot asphalt mixtures.