Cyclic Behavior of Very Short Steel Shear Links
Publication: Journal of Structural Engineering
Volume 142, Issue 2
Abstract
A replaceable coupling beam is proposed comprising of steel hybrid shear links that are shorter than typical shear links in eccentrically braced frames (EBFs). Cyclic loading tests were conducted to examine the behavior of these very short shear links. The test variables included the steel type, length ratio, web stiffener configuration, and loading protocol. The link specimens showed two types of failure modes: link web fracture and fracture at the weld connecting link flange to end plate. The link specimens had an inelastic rotation capacity of approximately 0.14 rad, which is significantly larger than the capacity assumed for EBF links. Links using LY225 steel instead of Q235 steel achieved a 25% increase in inelastic rotation and 44% increase in cumulative plastic rotation. The overstrength factors of the very short shear links reached 1.9, significantly exceeding 1.5, which is the value assumed for EBF links by design provisions. Analysis suggests that large overstrength can develop in very short shear links due to the contribution of flanges and cyclic hardening of web steel under large plastic strains. In addition, axial deformation was measured as the links underwent inelastic shear deformation.
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Acknowledgments
The work presented in this paper was sponsored by the International Science and Technology Cooperation Program of China (Grant No. 2014DFA70950), the Tsinghua University Initiative Scientific Research Program (Grant No. 2012THZ02-1), the National Key Technology R&D Program of China (No. 2012BAJ07B01), and the National Natural Science Foundation of China (Grants Nos. 51261120377 and 91315310). The writers wish to express their sincere gratitude to the sponsors.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 2 • February 2016
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© 2015 American Society of Civil Engineers.
History
Received: Jan 20, 2015
Accepted: Jun 10, 2015
Published online: Aug 10, 2015
Discussion open until: Jan 10, 2016
Published in print: Feb 1, 2016
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