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Technical Papers
Apr 25, 2017

Hybrid Testing of the Stiff Rocking Core Seismic Rehabilitation Technique

Publication: Journal of Structural Engineering
Volume 143, Issue 9

Abstract

The use of a stiff rocking core (SRC) has been proposed as a seismic rehabilitation technique to mitigate soft-story response in low-rise to midrise steel concentrically braced frame (CBF) structures. This technique uses a stiff, elastic “spine” to provide corrective lateral forces at the onset of soft-story response but otherwise remains passive for the first mode vibration response. Yielding link element can also be incorporated in the SRC-to-structure connection to dissipate energy and reduce overall building drift. An experimental testing program was performed to investigate the fundamental behaviors of the SRC rehabilitation technique applied to two approximately 1/3-scale prototype CBFs representative of modern and older design practices. Hybrid testing methods were used to simulate building dynamics, the influence of gravity framing, and response of upper stories for a midrise prototype building. Each prototype frame was subjected to two seismic ground motions to evaluate cumulative damage followed by quasi-static cyclic testing to failure. The results from these tests indicate that the SRC is effective at mitigating soft-story response by vertically redistributing lateral demands throughout the structure.

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Acknowledgments

This research was supported by the U.S. National Science Foundation under Award No. CMMI-1134953. Any opinions, findings, conclusions, and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the sponsor. The authors would also like to acknowledge the University at Buffalo’s (UB’s) Network for Earthquake Engineering Simulation (NEES) staff for their support and assistance throughout this experimental testing program.

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Information & Authors

Information

Published In

Go to Journal of Structural Engineering
Journal of Structural Engineering
Volume 143Issue 9September 2017

History

Received: Jun 27, 2016
Accepted: Feb 6, 2017
Published ahead of print: Apr 25, 2017
Published online: Apr 26, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 26, 2017

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Authors

Affiliations

Derek Slovenec, S.M.ASCE [email protected]
Graduate Research Assistant, Dept. of Civil Engineering, Case Western Reserve Univ., Cleveland, OH 44106 (corresponding author). E-mail: [email protected]
Alireza Sarebanha, S.M.ASCE
Graduate Research Assistant, Dept. of Structural Engineering, Univ. of California, San Diego, La Jolla, CA 92093.
Michael Pollino, M.ASCE
Assistant Professor, Dept. of Civil Engineering, Case Western Reserve Univ., Cleveland, OH 44106.
Gilberto Mosqueda, M.ASCE
Associate Professor, Dept. of Structural Engineering, Univ. of California, San Diego, La Jolla, CA 92093.
Bing Qu, M.ASCE
Associate Professor, Dept. of Civil and Environmental Engineering, California Polytechnic State Univ., San Luis Obispo, CA 93407.

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