Displacement-Based Design of Buildings with Torsion: Theory and Verification
Publication: Journal of Structural Engineering
Volume 140, Issue 6
Abstract
Direct displacement design (DDD) is a procedure that allows one to distribute the forces induced by an earthquake to the levels of a multistory building to ensure that the desired level of interstory drift is not exceeded. To date, DDD has only been applied to buildings that do not exhibit significant torsional response. This paper presents a methodology to perform displacement-based design (DBD) on multistory buildings with in-plane torsional irregularities, thereby generalizing DBD for buildings with torsion. The procedure includes decoupling the contribution of the deformation that results from translation and torsion by using an existing approximation technique. The approach is validated by using detailed finite-element models of asymmetric buildings; it is found to accurately reproduce the desired dynamic structural properties. Both linear and nonlinear (elastic-perfectly plastic) systems are demonstrated and the accuracy is verified. The method is shown to be very accurate for linear systems and slightly conservative for nonlinear systems.
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Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant No. CMMI-1314957 (NEES Research). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the investigators and do not necessarily reflect the views of the National Science Foundation. The authors kindly acknowledge the Co-Investigators of the NEES-Soft Project including Weichiang Pang at Clemson University, Michael D. Symans at Rensselaer Polytechnic Institute, Mikhail Gershfeld at Cal Poly—Pomona, and Xiaoyun Shao at Western Michigan University. Thank you also to the senior personnel of the NEES-Soft project: David V. Rosowsky at Rensselaer Polytechnic Institute, Andre Filiatrault at University at Buffalo, Gary Mochizuki at Structural Solutions Inc., Shiling Pei at South Dakota State University, Douglas Rammer at the U.S. Forest Products Lab., David Mar at Tipping Mar, and Charles Chadwell at Cal Poly—SLO.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 18, 2012
Accepted: Jun 14, 2013
Published online: Jun 17, 2013
Published in print: Jun 1, 2014
Discussion open until: Aug 3, 2014
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