Seismic Retrofit of Steel Moment-Resisting Frames with High-Performance Fiber-Reinforced Concrete Infill Panels: Large-Scale Hybrid Simulation Experiments
Publication: Journal of Structural Engineering
Volume 140, Issue 3
Abstract
Recent earthquakes around the world have demonstrated that steel moment-frame buildings designed based on older seismic provisions are seismically deficient. To enhance the seismic performance of these buildings, a new seismic retrofit system has been developed and evaluated experimentally as part of a two-story steel moment-resisting frame, designed in California in the 1980s. The proposed retrofit system consists of high-performance fiber-reinforced concrete (HPFRC) infill panels acting as energy dissipation elements that can be easily replaced after a major earthquake. Through two large-scale hybrid simulation tests of the retrofitted two-story steel moment-resisting frame, it is demonstrated that (1) the proposed retrofit system is effective in terms of reducing the maximum story drift ratios and residual deformations of the retrofitted steel moment resisting frame relative to the predicted bare frame performance, and (2) the structural damage of the retrofitted steel moment-resisting frame is kept minimal because energy dissipation is concentrated in the infill panel retrofit system.
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Acknowledgments
This study is based on work supported by the U.S. National Science Foundation (NSF) under Grant No. CMS-0530383 within the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Consortium Operations. The Herrick Corporation in Stockton, CA, generously donated the steel frame and associated parts of the test setup, including erection; Midstate Precast generously donated the fabrication of the HPFRC infill panels; Bekaert donated the steel fibers; D. G. Figley and Nibbi Brothers donated material and equipment. The financial support of NSF and various donors is gratefully acknowledged. The authors also thank the undergraduate students A. Cantu, D. Ouyang, E. Flores, J. Dory, K. Morales, S. Vanderboll, William Tressler, M.S. (Stanford University), Dr. Andreas Schellenberg, Dr. Selim Gunay, Dr. H. Kim, Dr. Shakhzod Tachirov, and the rest of the technical staff at the NEES facility at the University of California at Berkeley for their assistance with many aspects of the hybrid simulation testing program. The authors would also like to thank Mr. Ron Hamburger, Mr. David Mar, and Dr. Greg Luth for their valuable input regarding the proposed testing phases of the experimental program. Any opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 3 • March 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 13, 2012
Accepted: May 16, 2013
Published online: May 20, 2013
Published in print: Mar 1, 2014
Discussion open until: Apr 8, 2014
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