Application of Energy Dissipation Devices for Seismic Protection of Soft-Story Wood-Frame Buildings in Accordance with FEMA Guidelines
Publication: Journal of Structural Engineering
Volume 142, Issue 4
Abstract
Recent earthquakes have demonstrated the vulnerability of soft-story wood buildings. A performance-based retrofit option focusing on stiffening/strengthening only the soft ground story, as regulated by FEMA guidelines, was proposed in an attempt to achieve collapse prevention of the ground story while at the same time ensuring damage control of the upper stories. This paper focuses on an alternative retrofit approach that focuses on energy dissipation, in order to achieve a performance that is essentially comparable to the inherent performance target defined in FEMA guidelines. A viscous damper retrofit is designed based on conclusions drawn from parametric studies. Then, the proposed retrofit is validated via slow pseudodynamic hybrid testing of a full-scale three-story building. The test data are presented, interpreted, and compared against both pretest numerical predictions and posttest simulation results after model calibration. It is demonstrated that a damping retrofit, as compared to a stiffening/strengthening retrofit, better complies with the FEMA retrofit standards due to its effectiveness in reducing ground-story peak deformations while being less likely to propagate damage to the upper stories.
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Acknowledgments
This research was supported by the National Science Foundation (NSF) under Grant No. CMMI–1041631 and 1314957. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of NSF. This research was conducted through the Network for Earthquake Engineering Simulation (NEES) program, which facilitated collaboration between the universities and sharing of experimental testing facilities. In particular, the technical assistance provided by the NEES staff at the University at Buffalo is sincerely appreciated. The assistance of Dr. Xiaoyun Shao (Western Michigan University) in developing the hybrid control program is recognized along with the contribution of Mr. Pouria Bahmani (Colorado State University), Mr. Mikhail Gershfeld (Cal-Poly Pomona), and Mr. Gary Mochizuki (Simpson Strong-Tie, Inc.) in designing the full-scale hybrid test building. The assistance of Ms. Elaina Jennings (Colorado State University) in conducting the experimental tests and Mr. Robert Evans (Rensselaer Polytechnic Institute) in calibrating the numerical model for the hybrid test building is gratefully acknowledged.
References
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Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 4 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 14, 2014
Accepted: Jan 6, 2015
Published online: Jul 20, 2015
Discussion open until: Dec 20, 2015
Published in print: Apr 1, 2016
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