题目： Experimental and Analytical Studies on the Seismic Behavior of
Unanchored Building Contents
Dimitrios Konstantinidis, Ph.D.
McMaster University, Hamilton, Canada
During strong earthquake shaking, equipment and building contents located at various floor levels of offices, research laboratories, hospitals, emergency centers and other critical facilities, may slide, twist, rock, or even overturn. The high accelerations that develop during shaking of the equipment are a major concern for the functionality of the equipment or the integrity of items stored in the equipment. Excessive displacements and overturning of large equipment can endanger building occupants by direct impact or by blocking evacuation pathways.
This presentation discusses recent experimental and analytical studies on the seismic response of unanchored building contents. Results of shake table tests on full-scale equipment sub­jected to ground and floor motions of various hazard levels are shown. Numerical simulations with the proposed models for the equipment are performed. A physically motivated intensity measure and the associated demand parameter are identified with the help of dimensional analysis and easy-to-use fragility curves are presented.
Subsequently the presentation explores the effectiveness of base isolation as a seismic mitigation technique for reducing the seismic demands on sliding equipment. Numerical investigations conclude that, while seismic isolation is generally effective, in certain cases it results in amplification of the peak sliding displacement of free-standing equipment.
Dimitrios A. Konstantinidis is an Associate Professor in the Department of Civil Engineering at McMaster University. He received his Bachelor’s (1999), Master’s (2001), and Ph.D. (2008) degrees from the University of California at Berkeley. Before joining McMaster University, he was Postdoctoral Fellow at UC Berkeley and the United States Lawrence Berkeley National Laboratory. His research interests and experience are in earthquake engineering and engineering mechanics with a primary focus on seismic isolation, nonstructural components, rocking structures, and resilience of nuclear and other critical facilities.
His work combines experimental testing, analytical methods, and numerical simulation for a wide range of purposes: gaining a deep understanding of behavior; providing an accurate characterization of response; proposing innovative seismic protection solutions; and providing recommendations for improved design codes and standards. He has conducted extensive research on the mechanics of multilayer rubber bearings, on the response of base-isolated buildings and their nonstructural components, and on low-cost seismic isolation solutions for developing countries, where the cost of conventional isolators is prohibitive. He has supervised 8 doctoral and 8 masters students, and he has published 1 book, over 30 papers in high-impact journals, and over 50 papers in international conferences. He is a technical committee member and major contributor in codes and standards, including the Canadian Standards Association CSA S832 (Seismic risk reduction of operational and functional components of buildings) and CSA N289.1 (General requirements for seismic design and qualification of CANDU nuclear power plants).
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