Day 1 :
The Ohio State University
Time : 10:00 - 10:30
Halil Sezen has received his B.S., M.S., and Ph.D. degrees from the Middle East Technical University, Ankara, Turkey; Cornell University, New York; and University of California, Berkeley; respectively. Professor Sezen has been a faculty member at The Ohio State University since 2002. He has more than 130 technical publications. He has been serving as an assocaite editor and editorial board member of several journals including the ASCE Journal of Structural Engineering, and Engineering Structures.
Gravity load collapse response of five actual buildings is investigated by pyshically testing them and through computational simulations. Steel columns and load bearing walls were removed from the first story of three steel frame buildings and two masonry wall buildings. Four of the test buildings were located on the Ohio State University campus. The goal of the experimental and computational research is to better understand and model the building system resistance to loss of one or more vertical members, e.g., due to fire, seismic or blast loading, although the column and wall removal process in this research was load independent. The test data obtained from the field experiments were used to validate the computational models developed to simulate static and dynamic collapse response of existing buildings that may experience progressive collapse after sudden loss of columns or walls. This research investigated redistribution of internal forces within the building after the loss of vertical load carrying members. Current design guidelines and methodologies and potential analysis methods have been evaluated using the test data from field experiments. Progressive collapse response of test buildings was simulated using two and three-dimensional structural models and compared with the experimental data. This study showed robustness of different structural systems and potential contribution of structural components to collapse resistance under extreme loads.
The University of New South Wales
Time : 10:30-11:00
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. Brian is Chairman of the Standards Australia Committee BD32 on Composite Structures which is currently preparing the Australian/New Zealand Standard AS/NZS2327 on composite structures for buildings. 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. Brian is Chief Editor (Asia-Pacific) for Steel and Composite Structures and serves on the Editorial Board of Journal of Constructional Steel Research and Advanced Steel Construction. He also currently serves on the American Institute of Steel Construction (AISC) Task Committee 5 on Composite Construction and the IABSE Working Commission 2 on Steel, Timber and Composite Structures.
This paper will look at the important Advances, Behaviour, Construction and Design practices in the area of steel and composite structures focusing on Australian Experiences. A historical expose of the use of steel and composite structures will be provided, together with the Advances in material behaviour, particularly steel strengths. Significant research which has looked into the fundamental Behaviour of steel and composite structures over the last half century will also be provided. As is often the case, Construction often leads the way in innovation and this will also be highlighted in the paper. Finally, the paper will focus on Design and the significant developments in Australia to codify recent advances in steel and composite structures for buildings and bridges focusing on the soon to be released AS/NZS 2327 and AS/NZS 5100: Part 6 on steel and composite structures for buildings and bridges respectively.
University of North Texas
Time : 11:00- 11:30
Cheng Yu is an Associate Professor in the Construction Engineering Technology program at the University of North Texas. He completed his PhD in Civil Engineering from the Johns Hopkins University. He is the Author of numerous articles on cold-formed steel behavior and design and serves on the AISI Committee on Framing Standards.
The paper presents a test program aimed at investigating the pull-over strength of screws installed on the anchored leg of the cold-formed steel clip angle connectors. Initial confirmatory tests showed that the tested pull-over strength was significantly less than the predicted values that were determined using AISI S100 (2012). Therefore, additional specimens were tested in order to develop an appropriate design method for the pull-over strength of screws used in CFS clip angles. The test results indicated that the pull-over strength of screws when used in clip angles would experience 50% reduction in nominal strength. A proposal to revise the current design provision in AISI S100 was presented in this paper along with complete details of the test program.