• IStructE Conference on
    Structural Engineering in Hazard Mitigation 2013
    • Palace of Westminster
      London
    • Tiananmen Square
      Beijing
    • Tongji Architectural Design (TJAD)
      Shanghai
    • Tower Bridge
      London
    • Tsinghua University
      Beijing
    • Tsinghua University
      Beijing
    • Tongji University
      Shanghai

Keynote Speaker

Prof. Yi-Yi Chen

Prof. Yi-Yi Chen

State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China
The Concept of 'Buckling Hinges' in H-shaped Steel Members with Non-plastic Elements and Its Usage in Seismic Design

Prof. Yi-Yi Chen graduated from Tongji University with his Bachelor Degree of Engineering in 1983, and he obtained his Doctoral Degree of Engineering in 1994 from the University of Tokyo. After then, Prof. Chen joined Tongji University, and was appointed Professor in 1997, and then Dean of College of Civil Engineering in 2002. In 2008, Prof. Chen was appointed Vice-President and Dean of Graduate School, and then Executive Vice-President of Tongji University in 2013.

Prof. Chen is a world renowned expert in steel and composite structures, light-weight structures as well as earthquake resistant structures. He has published over 200 national and international journal papers as well as 150 conference papers. Prof. Chen is an author or co-author of 12 technical books, and he has contributed to the drafting of various codes and specifications in steel structures, structural hollow sections, concrete-filled tubes, and light gauge steel structures. Prof. Chen is the recipient of 10 national awards for his outstanding achievements in education, construction as well as science and technology from various government agents. Currently, Prof. Chen is Vice-President of China Steel Construction Society, Co-Director of Education Committee of China Civil Engineering Society, Vice-President of Shanghai Association of Metal Structures. He is also Chief Editor of the Journal of Building Structures and serves the Editorial Boards of a number of national and international journals. Prof. Chen was elected Fellow of the Institution of Structural Engineers, U.K. in 2011.

Abstract

Steel frames composed of H-shaped non-plastic members (NP members), within the scope of thin-walled steel frames, are economical and favorable to sustainability due to their load carrying efficiency. Series of studies for the seismic performance of NP members and NP frames (frames composed of NP members), including the failure mechanism, loading capacity, deformability and energy dissipation capacity, have been conducted at Tongji University. The research indicates that when H-shaped NP members bent about the strong-axis, limited resisting strength but certain plastic deformability as well as energy dissipation capacity is exhibited. A concept named 'buckling hinge' was put forward to describe the post-buckling performance of NP members, where the degrading rate in post-ultimate stage is determined by the plate slenderness and axial force ratio. The failure mechanism and horizontal resistance of low rise frames can be predicted by the 'buckling hinge' assumption with satisfactory accuracy. It is found that a certain degree of stable non-linear deformation of NP frames can be expected even though their individual NP member deteriorates after yielding. Finally, equations for resistance of NP frames, including a plastic effective width method for calculating the ultimate strength of NP members and a simple method for estimating the yield capacity of NP frames are proposed.

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The website will be up-dated monthly. This is the Oct 2013 version