Quantifying the seismic response of structures with flexible diaphragms |
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Authors: | Vinod K. Sadashiva Gregory A. MacRae Bruce L. Deam Matthew S. Spooner |
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Affiliation: | 1. Department of Civil and Natural Resources Engineering, University of Canterbury, P. Bag 4800, Christchurch, New Zealand;2. Novare Design, Wellington, New Zealand |
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Abstract: | Floor diaphragm in-plane stiffness affects building response to horizontal ground accelerations. This paper describes a series of elastic and inelastic time history analyses of symmetric structures with different deformation types, configurations and heights to quantify these effects. It is shown that displacements of single storey elastically responding structures tend to be most significantly affected by diaphragm flexibility. Analyses of these structures were cross-verified by a closed-form mechanics-based formulation developed to describe the response. Simple relationships were proposed to allow designers to conservatively estimate the increase in peak in-plane displacement resulting from diaphragm flexibility. Copyright © 2012 John Wiley & Sons, Ltd. |
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Keywords: | Diaphragms diaphragm flexibility dynamic analysis lumped mass models building codes seismic design seismic response |
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