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原文传递 Seismic Design of Diaphragms for Steel Buildings Considering Diaphragm Inelasticity

题名：	Seismic Design of Diaphragms for Steel Buildings Considering Diaphragm Inelasticity
正文语种：	eng
作者：	Gengrui Wei;Hamid Foroughi;Shahabeddin Torabian;Matthew R. Eatherton;Benjamin W. Schafer
作者单位：	Virginia Tech.;Johns Hopkins Univ.;Johns Hopkins Univ.;Virginia Tech.;Johns Hopkins Univ.
关键词：	Steel buildings with braced frames;Steel deck diaphragms;Seismic diaphragm design procedures;Nonlinear response-history analysis;Collapse behavior and performance
摘要：	Abstract Recent research has shown that seismic design forces for horizontal floor and roof diaphragms that have been in the US building codes for decades are not sufficiently large to protect the diaphragm from inelastic actions. These findings led, in part, to the development of alternative diaphragm design provisions in US standards, which use increased diaphragm force demands, but allow for a reduction of the demands by a unique diaphragm design force reduction factor, Rs. In this study, the effect of different diaphragm design philosophies on the behavior of steel buildings is investigated using three-dimensional computational building models that consider nonlinear behavior in both the vertical and horizontal elements of the lateral force–resisting system (LFRS). Objectives include examining the effect of diaphragm inelasticity on building dynamic behavior, understanding seismic diaphragm force demands, investigating collapse probabilities for different diaphragm design approaches, and evaluating proposed Rs values for bare steel deck and concrete-filled steel deck diaphragms. Building parameters were varied such as diaphragm design approach (traditional and alternative design with different Rs values), building height (1-, 4-, 8-, and 12-story archetype buildings), and type of LFRS (buckling restrained braced frames or special concentrically braced frames). Nonlinear response-history analyses were performed, and resulting performance in terms of drift and collapse were evaluated. It was found that traditionally designed building diaphragms can experience substantial inelasticity during earthquake response. Computed adjusted collapse margin ratios for buildings utilizing the alternative diaphragm design procedure with Rs=2.0 for concrete-filled steel deck floor diaphragms and Rs=2.5 for bare steel deck roof diaphragms satisfy US design criteria for acceptance and are recommended for use in design of these types of structures.
出版年：	2023
期刊名称：	Journal of structural engineering
卷：	149
期：	7
页码：	04023077.1-04023077.17