Chapter
Apr 26, 2012
Large-Scale Testing of Steel Unbonded Braces for Energy Dissipation
Authors: Peter W. Clark, Ian D. Aiken, Kazuhiko Kasai, and Isao KimuraAuthor Affiliations
Publication: Advanced Technology in Structural Engineering
Abstract
This paper outlines large-scale tests of tension/compression yielding braces (also called "unbonded braces") in support of their first applications in the United States. The core steel in these braces provides stable energy dissipation by yielding under reversed axial loading, while the surrounding concrete-filled steel tube resists compression buckling. The paper summarizes a series of tests on large-scale unbonded braces, having yield forces of 1200, 1600, and 2100 kN (270, 360, and 470 kips). Each brace was subjected to a cyclic loading pattern consistent with that used widely for testing steel beam-column connections. Additional tests explored the behavior of the braces under a near-field loading history, a displacement time history derived from a seismic analysis of an idealized 5-story building, and a low-cycle fatigue test.
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© 2000 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Authors
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Peter W. Clark
Senior Project Engineer, Seismic Isolation Engineering Inc., P.O. Box 11243, Oakland, CA 94611-0243
Ian D. Aiken
Principal, Seismic Isolation Engineering Inc., P.O. Box 11243, Oakland, CA 94611-0243
Kazuhiko Kasai
Professor of Structural Engineering, Structural Engineering Research Center, Tokyo Institute of Technology, Nagatsuta, Midori-Ku 226-8503, Japan
Isao Kimura
Group Manager, Overseas Marketing & Engineering Group, Nippon Steel Corporation, 6-3 Otemachi 2-chome, Chiyoda-ku, Tokyo, Japan
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