2nd World Congress and Exhibition on Construction and Steel Structure September 22-24, 2016 Las Vegas, Nevada, USA

Biography:

Prof Ir. Dr Mahmood joined UTM in May 1985 as Assistant Lecturer “A” after completing his first degree from University of Iowa, USA. He taught diploma students from May 1985 to 1988 before pursuing his Master degree at University of Nebraska Lincoln, USA. After completing his master degree (M.Sc) in Structure Engineering, he continued to serve FKA, UTM from 1989 to 1993. He continued his study for Ph.D in Jan 1994 at University of Warwick, U.K and managed to complete his study in May 1997. During his involvement in research and publication for the last 20 years, he has published 72 indexed journals and 78 conference papers. His main areas of research are steel structures, composite structures, and concrete structures. He also has registered as member of Institute Engineer Malaysia (MIEM). At present, he is a director of UTM Construction Research Centre.

Abstract:

Concrete filled steel tubular column exhibits various advantages over steel and reinforced concrete columns. Nevertheless, it is difficult to predict its fire resistance properties due to non-linear behaviour of steel and concrete at elevated temperatures. In this study, a 3D numerical model was developed by using finite element software, ABAQUS 6.12, to predict the thermal and structural behaviour of axially loaded square concrete filled steel tubular column subjected to fire. The range of specimens is limited to dimensions of cross-section, type of concrete (plain or bar-reinforced), steel tube thickness, as well as thickness of fire protection. Our results demonstrated that numerically predicted temperature development across the column’s cross-section and fire resistance. It corroborated with those reported by previous researchers and Eurocode 4 simplified calculation model. In fact proposed 3D numerical model proved to be capable of providing better fire resistance predictions than Eurocode 4 calculation model. Therefore, the verified 3D numerical model was used as an alternative to conduct an in-depth study of the fire behaviour of axially loaded steel tubular column filled with concrete.

Biography:

Saad Al-Motham has completed his Bachelor and Master of Science degrees from Colorado School of Mines in 2013 with an emphasis on the area of Physical Metallurgy of Steel. He currently holds a Scientist position in Metals Technology Department at SABIC Technology Center in Jubail, Saudi Arabia. He conducts research pertaining to product development and process enhancement within the area of long product steel rolling.

Abstract:

After rolling quenched and self-tempered (QST) steel rebars, high water pressure is applied on the bar resulting in a martensite ring formation on the rebar surface. Subsequently, the core of the bar transforms to a high temperature transformation product and the martensite layer is tempered by the heat flowing outwards from the core. The combination of these two macro-constituents determine the overall mechanical properties of the bar. The depth of the martensite layer is an important material design parameter determining important material characteristics such as TS/YS ratio which is becoming increasingly of interest. A novel procedure to assess the relationship between the martensite layer depth and mechanical properties is devised in this work. Using industrially supplied QST rebars, a series of cylindrical samples of decreasing diameters have been prepared. By machining the samples to gradually decreasing diameters, the martensite ring is gradually removed until samples with only the core structure are obtained. Tensile testing is performed for all samples, therefore, enabling the assessment of varied martensite thickness effects on the mechanical properties of the overall rebar. The correlation between the amount of tempered martensite and yield strength, tensile strength, TS/YS ratio, elongation, reduction in area are characterized and quantified using this procedure.

Biography:

Howida Borziza, MArch, is the Senior Architect at Gulf Consult-Kuwait with responsibility for Construction Consultation of the tall academic projects by considering the architectural aesthetical design requirements and approving materials, drawings and method of delicate finishing items such as curtain walls, Sky lights, claddings, floorings, etc. Prior to joining Gulf Consult-Kuwait, she was running a successful consultant office Al-Namariq Consultants in Benghazi, Libya since 2000, where she has completed many land mark projects, which includes Passport and Control Department Project in Port Benhazi (2012), Rainbow Tower–Benghazi in 2013. She is in the construction industry since past 20 years and has completed many land mark projects in Libya as well in Kuwait. She has received Architecture and Urban Planning Engineering Degree from University of Garyounis, Libya in 1996; following that, she received Higher Graduate Education in Architectural Engineering from University of New Brunswick, Canada in the year 2008; and currently she is pursuing her Research on Applied Science Architectural Engineering in Alkhartum University in Sudan University, which is expected to be completed in 2017.

Abstract:

Biography:

Mojtaba Valinejadshoubi is currently the PhD student of Civil Engineering at Concordia University of Montreal, Canada. His research interests include application of BIM in SHM, modular building construction, construction project management, energy modeling and seismic risk assessment. He has authored 23 international articles, including 13 international conference papers and 10 international journal papers, and one national patent application till now. He is the Member of Golden Key International Honour Society in Canada. He won several scholarships and awards such as the Award of Excellence Certificate from Faculty of Civil Engineering at UTM, Concordia University Full Tuition Recruitment Award, CN Graduate Fellowships in railway dynamics, UNIPRS and UNRS Central 50:50 scholarships from the University of Newcastle Australia

Abstract:

One of the issues in structural health monitoring (SHM) and any other monitoring systems such as indoor air quality monitoring have to deal with huge amount of original raw data as well as all post processed data which can add up to hundreds of Gigabytes or even more. Therefore, effective data management is a significant task which cannot be implemented properly except by using appropriate tools. Building information modeling (BIM) has emerged as a powerful data management tool by obtaining, sorting, storing, sharing and recalling data and provide a digital environment of them. Using BIM in monitoring systems such as SHM will be an effective way to solve their data management issue. Making BIM dynamic by recording the real time SHM data will be effective for engineers, facility managers and owners by providing updated information about the ongoing health and state of various parts of the building. The main objective of this study is to focus on using BIM in managing the data of monitoring systems in particular in SHM system. For this purpose, a four story office building is modelled in Revit architecture and Revit structure in this study to demonstrate the feasibility of creating and visualizing the information about the sensors installed in the structure for the purpose of structural health and air quality monitoring. Also, the BIM model is made dynamic by linking relevant external resources related to the sensors such that the sensor data can be managed in real time and the information related to the sensors is up to date. This research lays the foundation for further implementation of using BIM in SHM purpose.

Biography:

Azin Shakibabarough graduated with BS degree in Civil Engineering from University of Mazandaran, Iran in 2008. After receiving Bachelor’s degree, she worked about three years as a Civil Engineer in a building company. She received her Master’s degree in the field of Construction Management from University Technology Malaysia in 2013. She is currently a PhD student of Civil Engineering at Concordia University of Montreal Canada. Her research interests include structural health monitoring (SHM), infrastructure sustainability and construction project management. She has authored/coauthored 16 articles in technical journals and conferences. She won Concordia University International Tuition Fee Remission Award.

Abstract:

Biography:

Takayuki Kinoshita has completed his Bachelor of Engineering degree in 2016. He has been a Master’s student at Tokyo University of Science and investigated about Steel Structural Engineering. In research activities, he submitted some papers to academic journals of architectural institute of Japan. 

Abstract:

In recent years, the terrible earthquake events that were not expected in the design procedure have occurred in the world. So, it is necessary to estimate the seismic performance accurately. In this paper, it is focused on the energy absorbing efficiency of steel braced frames. Braces in a steel framed structure show the complicated and unstable behavior because many kinds of buckling and fractures are combined. Evaluation method of restoring force characteristics and capacity have been studied in enormous past researches, however, there are some problems to adopt for design procedure. Also the response characteristics of steel braced frames are affected by the interaction between frames and braces and by the brace type. This paper suggests the analytical method to evaluate the energy absorbing efficiency of steel braced frames as equivalent strength. The equivalent strength is formulated with yield shear coefficient of the frame and slenderness ratio of the brace. Also, to verify the applicability of multi-story steel braced frames, response analysis of two types of 5-story steel braced frames (X-brace, K-brace) were conducted. As compared with energy absorbing efficiency of the response analysis result, it is confirmed that the equivalent strength can be accuracy of plus or minus 20% or so.

Biography:

Jeongsu Ju is a Graduate student at Steel Structure and Architectural Engineering Department of University of Seoul. His research focuses on experimental and analytical studies of steel structures and nuclear facilities, composite structures and tall buildings.

Abstract:

The axial force of bolts is very important for structural stability. To obtain the stability of a structure, the axial force of bolts should satisfy specifications and be maintained consistently. Hence, it is important that the axial force of bolts is measured and carefully watched. However, measuring axial force using sensors is very expensive. Torque method frequently used in the field does not provide accurate values of axial force due to the changes in torque coefficient. This study suggests a surveillance system to measure and monitor bolt axial force. The purpose of the study is to examine how the long-term behavior of concrete exerts influence on the axial force of bolts used in structures and to verify the reliability of the suggested surveillance technology. 

Biography:

A concentric braced steel frame is a very efficient structural system because it requires relatively smaller amount of materials to resist lateral forces. However, primarily developed as a structural system to resist wind loads based on an assumption that the structure behaves elastically, a concentric braced frame possibly experiences the deterioration in energy dissipation after brace buckling and the brittle failure of braces and connections when earthquake loads cause inelastic behavior. Consequently, plastic deformation is concentrated in the floor where brace buckling occurs first, which can lead to the rupture of the structure. This study examines reinforcement strategies for reinforcing previously installed H-shaped braces with non-welded cold-formed stiffeners to suppress bending and buckling and securing equal strength for tensile force and compressive force.  In order to verify the compressive behavior of the reinforced braces, structural performance test was conducted with variables of slenderness ratio and the amount of reinforcement. The length of the stiffener and reinforcement quantity were suggested as the reinforcement strategies for the H-shaped braces installed on the braced frame. As a result of applying and evaluating experimental results, it is expected that economical sections satisfying required reinforcement quantities can be derived

Abstract:

Seul-Ki Hwang has be enrolled her Master’s degree in Architectural Engineering department from University of Seoul. Her research focuses on experimental and analytical studies Buckling Restrained Braces(BRB) and High-rise Steel Composite Structure

Biography:

A Sabamehr is studying his PhD under supervision of Dr. Bagchi in Concordia University. He is working on Vibration Base Damage Detection (VBDD). He has passed all of his courses with CGPA 4.3/4.3. He has published more than 10 conferences and 2 conference proceeding journals and is working in one journal in springer to publish soon. During his study, he has been a TA for most of the structure courses.

Abstract:

In the past, damage detection and structural health monitoring (SHM) in vibration-based methods have been utilized for many case studies. Generally, the methods have been categorized into two main groups such as Finite Element method (Physics-based method) and mathematical method (data-driven method). According to some defects in implementation procedure, the outcomes have not matched with modeling results, therefore the model updating method have been used to correlate the result by applying the stiffness modifier. Basically, model updating problem is an inverse problem, the Physics-based model have mostly non-unique solution. Meanwhile, data-driven models using method such as artificial neural networks (ANN) use the differences in the data patterns in the structural response in order to update the system parameters. In this paper, four story book shelf have been investigated for Ambient Vibration Test (AVT). The structure has instrumented with four wired accelerometers which one of them is placed in each story. There two different model updating techniques which have been considered for this case study such as ANN and Matrix Update Method. The result indicates that Matrix Update Method (Physics based method) is more accurate than ANN (date driven method) in this case study.

Biography:

Mr. Hideaki Azu is Japanese and has lived in Tokyo for 24 years. He took the degree of department of architect in Tokyo University of Science, Tokyo, in 2015. He is now a master course student of Tokyo University of Science. His research interest includes vibration control structure called as Scaling-Frame structure.

Abstract:

The innovated vibration control device called as “Scaling Frame” (abbreviated as “SF”) structure is proposed by the author. SF structure consists of beam-column frame, diagonal bracing, and SF device (abbreviated as “SFD”) made of Aluminum or Steel. And, vibration energy is absorbed by plastic behavior of diagonal deformation of SFD. SF structure has been already adopted for low-rise wooden buildings in Japan. In this study, SF structure is assumed to apply on multi-story steel frames, that is, in which high strength and rigidity are required. So then, a hybrid SFD (abbreviated as “HSFD”) which consist of various shapes of SFD is developed herein. And also, to clarify the fundamental restoring force characteristics of HSFD, horizontal static cyclic loading test is conducted. From tests results, it is confirmed that the rigidity and strength of devices is expressed in the sum of each SFD which constitutes HSFD, and the stable hysteresis behavior is presented. It means that the strength and rigidity can be adjusted easily by combination of SFD. Furthermore, the analytical study is done by use of restoring force characteristics model of each shapes of SFD. From the comparison between test results and analysis results, it is observed that the proposed analytical model of HSFD can pursue the test result during cyclic loading well. And also, by use of various types of SFD in substitution for normal type of SFD, it is possible to decreas the number of necessary device more.

Biography:

Ryotaro Arai(Japan,1992) has completed his Bachelor of Engineering degrees in 2015. And he is now a master course student of Tokyo University of science (TUS) and investigated about steel structural engineering. In research activities, he submitted some paper to an academic journal of architectural institute of Japan.

Abstract:

A lot of steel structures have experienced severe earthquake disasters in Japan, and its various kinds of failure mode have been reported. Especially on steel braced structure, the failure modes are generally categorized into two modes; buckling and fracture of brace member, and yielding of joints and fasteners. After a lot of earthquake disasters, the technical manual has been published to repair and recover the damaged building structures in Japan. The manual suggests the actual repairing method for damaged steel braced structures; however, it is guessed that a few of these methods have some difficulties related to construction technique and estimation of recovery after repair. In this paper, new repairing method for joints on damaged steel brace structure has been proposed, and its applicability and feasibility are investigated experimentally. Herein, the horizontally loading test on diagonal steel brace are performed with parameters as follows; thickness of gusset plate, layout of bolts, slenderness ratio of brace and the method of joint. At first, the damaged state of gusset plate is reproduced by horizontally loading test. Next, the damaged gusset plate is repaired. Finally, the loading test is done to the repaired specimen again. From the test results, the strength is reinforced after repair, and the rigidity is almost same. The change of failure mode and slenderness ratio is presented, and which is related to eccentric distance and torsional parameters. Furthermore, the evaluation method of the failure mode and buckling strength are proposed, and this estimation method shows good utility.

Biography:

K.Mori has graduated at the age of 22 years from Tokyo University of Science(TUS) in March, and is going to master course in TUS from April, 2016.

Abstract:

This study is concerned with horizontally mixed structure system that an existing old R/C structure is seismically retrofitted by addition of exterior steel frame. This system is suggested as seismic retrofitting method in Japan. And some previous studies related to its seimic response mitigation effects were conducted analytically. This study focuses on ultimate seismic state on its multi-degree of freedom system, and the feasibility study of connection joint between exterior steel frame and existing R/C building is investigated. To determine the design point which estimates the ultimate seismic performance, monolithic load pattern considering seismic load effect is adopted on pushover analysis under structural design procedure. Herein, this composite system consists of two various structural system, and it is assumed that the complicated elasto-plasticity behaviours are presented during inelastic response. So this study suggests the envelope curve model which approximates the inelastic seismic response domain, and the load pattern is obtained by reference of this model. From comparison of proposed model and seismic response analysis, the predicted design points are corresponded each other. And also, it is observed that the predominant failure mode is changed on original and retrofitted state. So this paper suggests the retrofitting strategy which overall failure mode formation is guaranteed. Moreover, the actual connection method between steel frame and R/C building has been suggested. Herein, the required strength is calcurated by reference of design points, and ultimate strength of this proposed connection compares with the requirement. From comparisons, it is confirmed that this joint shows sufficient strength.

Biography:

Tomoe Onoda has completed her bachelor’s degree at the age of 22 years from Tokyo University of Scinece (TUS), Tokyo Japan, in 2016. She is now a master course student of Tokyo University of Scinece.

Abstract:

Recently, there have been many discussions about repairability for damaged building structures after severe disasters. In japan, a technical manual for repairing damaged buildings has been established, however, its repairabilities have not been reported sufficiently. In this study, the Box-Shaped Repair Method which has been suggested on japanese technical guideline is adopted for the damaged steel members, and its applicability and feasibility are investigated experimentally. Herein, the damaged portion on steel member such as plastic hinge or local buckling occurence is covered with steel plate by welding. So the loading test is performed as parameters with section size of steel members, thickness of cover plate and welding size during repair process, and loading path. The procedure of this study is as follows; the first, the damaged test specimens of H-shaped steel member with local buckling are reproduced by initial loading test. Next, the damaged specimens with plastic residual deformation are returned to the original position. Finally, the loading test is done after repair. From test results, it is confirmed that the fundamental sturctural performance such as the rigidity, maximum strength, and absorbed energy after repair are improved by comparison of original state. And also, these performance can be controlled by adjusting the thickness of cover plate and welding condition. Furthermore, from the observation of test results, the analytical model of repaired steel member is suggested. From the comparison of test results, it can be said that the proposed model shows good agreements both test results and theoretical figure.

Biography:

Itsuki Yagi has completed his Bachelor of Engineering degrees in 2016. And, he has been a master course student of Tokyo University of Science and investigated about steel structural engineering. In research activities, he submitted some papers to academic journals of architectural institute of Japan.

Abstract:

Recently, a various type of steel connection technique has been developed, which aims to possess the multi-demands on steel structures. In this study, a new fitting connection technique for steel square tube is suggested, and this joint consists as follows; lightweight steel square tube is just embedded to steel connector, and an adhesive is filled to the clearance between each member as filler, and a pin is inserted as a fail-safe mechanism against the uplift of the column. The adhesives adopted on this connection are widely used to adhere nonstructural members such as tiles and marbles in Japanese architectural building field. The advantage of this connection is not only improvement of workability due to needless of bolting and welding but also the adjustment of the bending strength and rigidity by filling methods and materials. This study investigates the resistant mechanism subjected to bending experimentally. Herein, the loading test is conducted as parameters with the existence of adhesives, pin and loading path. From test results, it is confirmed that the bending strength and rigidity are improved by the filling effect of adhesives, and the maximum bending strength is enhanced by the resistance of a pin during the ultimate state. Furthermore, the stress diagram subjected to bending is investigated from the test results, and a kinematic model of this connection considering the exfoliations of adhesives is suggested. It can almost evaluate the strength of the test results well.