Buildings with Rigid Walls and Flexible Roof Diaphragms. I: Evaluation of Current U.S. Seismic Provisions
Publication: Journal of Structural Engineering
Volume 142, Issue 3
Abstract
Buildings having rigid walls and flexible roof diaphragms (RWFD) are a type of building construction widely used for light industry in the United States; they incorporate rigid in-plane concrete or masonry walls and flexible in-plane wood, steel, or hybrid roof diaphragms. In this first of two companion papers, the probability of collapse of this type of building designed to current code provisions in the United States, given an MCE earthquake event, is evaluated according to the FEMA P695 methodology for a large set of representative building archetypes. The results of the study indicate that current code provisions for this type of building do not satisfy the collapse objective requirements of FEMA P695 under maximum considered earthquake ground motions. This is because the analysis provisions are based on assumed yielding of the walls rather than the roof diaphragm. Also, current code provisions considerably underestimate the period of RWFD buildings. To assist with creating provisions that take into account large flexible diaphragm deformations, a semi-empirical formula to estimate the fundamental period of RWFD buildings that accounts for roof diaphragm flexibility is derived in this paper. A new proposed seismic design approach for RWFD buildings is developed and evaluated in the second companion paper.
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Acknowledgments
This study was conducted as part of a project directed by the Building Seismic Safety Council (BSSC) of the National Institute of Building Sciences (NIBS) and funded by the Federal Emergency Management Agency (FEMA) under DHS/FEMA Contract HSFEHQ-09-D-0147, Task Order HSFE60-12-J-0002C. The main objective of this project was to develop simplified seismic design procedures for rigid wall-flexible roof diaphragm buildings. This financial support is gratefully acknowledged. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of NIBS and FEMA. The Structural Engineering and Earthquake Simulation Laboratory (SEESL) at the University at Buffalo is also acknowledged for providing partial financial support to the first author.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Nov 11, 2014
Accepted: Sep 14, 2015
Published online: Dec 10, 2015
Published in print: Mar 1, 2016
Discussion open until: May 10, 2016
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