doi:10.3850/978-981-07-7136-2_298
Progressive Collapse Analysis of Buildings: The Middle-way Approach
Professor Chan Ghee Koh
Department of Civil & Environmental Engineering,
National University of Singapore, Singapore 117576
Email: cgkoh @nus.edu.sg
Biography
Dr. C. G. Koh is a professor of Civil Engineering and the Director of Centre for Hazards Research at the National University of Singapore. He obtained his M.S. and Ph.D. in 1983 and 1986, respectively, at the University of California, Berkeley. His main research area is structural dynamics with recent interests including vibration-based structural health monitoring and nonlinear dynamic analysis of buildings for robustness evaluation. He was a recipient of the prestigious Marie Curie Fellowship awarded by the Commission of the European Communities and the IES Prestigious Publication Award.
Professor Koh has been invited to deliver many keynotes and invited presentations internationally in countries including USA, China, Japan, India, Australia, UK, Greece and Portugal. He is an Associate Editor for international journal on “Structural Health Monitoring” and Editorial Board Member for international journal on “Smart Structures and Systems”. He has been active in the professional community and conducted many short courses on structural dynamics (public and in-house). His expertise is well sought after in the industry, having served as an advisor or specialist in more than 80 industrial and infrastructure projects – including wind and earthquake analysis of high-rise buildings, vibration studies of high-tech buildings, bridges, train-track systems and offshore structures.
Abstract
Currently many methods for progressive collapse analysis (PCA) tend to be too sophisticated for robustness evaluation of building system. These methods not only are computationally demanding, but also require intensive pre/post processing efforts. Therefore, these methods are inadequate for decision making in routine design process. At the other end of the spectrum, overly simplistic methods are used which, however, do not necessarily model the progressive collapse with sufficient accuracy. For example, the important effects of floor slabs in resisting progressive collapse are ignored, thereby not providing realistic evaluation of structural system robustness. Motivated by the need for realistic and yet reasonably fast analysis, an middle-way approach for efficient progressive collapse analysis (ePCA) is explained in this keynote, accounting for column buckling, semi-rigid connection and membrane action of slab. The accuracy of ePCA is validated by comparing with experimental results available in the literature. The verification study shows that ePCA can capture the key progressive failure behavior of real composite floor system, especially the catenary action in large deformation response. The computational efficiency of this method enables incorporation of robustness design in building system in the early stage of design process.
