Empirical Selection Equation for Friction Pendulum Seismic Isolation Bearings Applied to Multistory Woodframe Buildings
Publication: Practice Periodical on Structural Design and Construction
Volume 19, Issue 3
Abstract
Base-isolation systems have been increasingly used in concrete and steel structures for seismic design, but their application to woodframe structures remains largely unexplored with only several hundred buildings isolated, primarily post-and-beam buildings in Japan. This paper examines the incorporation of friction pendulum (FP) bearings into the performance-based seismic design (PBSD) for woodframe structures using nonlinear time-history analysis. Specifically, a regressive equation for the selection of the bearing radius (R) based on the fundamental period and the seismic weight present on each FP bearing is developed. Six generalized models representative of 1- to 6-story woodframe buildings were analyzed and used to develop a regressive design equation. Based on rigorous multi-incremental dynamic analysis (M-IDA), a regressive linear relationship between the spectral acceleration and bearing radius of the FP bearing was developed. An illustrative application to a 4-story residential woodframe building is presented to illustrate use of the approximate design expression. Furthermore, the expression allows one to achieve a PBSD using base isolation with no specific need to consider the detailing of the superstructure configuration with the exception of the elastic period.
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Acknowledgments
The authors acknowledge partial funding from Colorado State University through the George T. Abell Professorship.
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Published In
Practice Periodical on Structural Design and Construction
Volume 19 • Issue 3 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 5, 2013
Accepted: Sep 9, 2013
Published online: Sep 11, 2013
Discussion open until: Jul 24, 2014
Published in print: Aug 1, 2014
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