Experimental Investigation of Self-Centering Beams for Moment-Resisting Frames
Publication: Journal of Structural Engineering
Volume 146, Issue 3
Abstract
Previously proposed self-centering moment-resisting frames relied on gap opening and closing in the beam–column interface to achieve recentering capability and energy dissipation capacity. The gap-opening mechanism in the connection interface induces deformation incompatibility with floor slabs and can require complex field construction. To address these drawbacks, a new type of self-centering beam (SCB) has recently been developed. The SCB uses high strength posttensioning (PT) strands inside the beam unit to provide recentering capacity and pretensioned bolt frictional devices to dissipate seismic energy. First, the mechanism of this new beam subassembly is explained and the equations governing the global behavior are given. Eleven approximately half-scale tests were conducted to isolate and investigate the effects of design parameters such as initial stress in the PT strands, and slip resistance in the friction device on system strength and stiffness when subjected to quasistatic cyclic loading. After cyclic displacements up to drift levels of 3%, all specimens experienced nearly zero residual drift, and no yielding was identified in the any of the structural members.
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Acknowledgments
The research described in this paper was sponsored by the National Natural Science Foundation of China (51208095); Qing Lan Project of Jiangsu Province; Fundamental Research Funds for the Central Universities (KYLX15_0080); Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17_0119); and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). The supporters are gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 3 • March 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 23, 2018
Accepted: Jul 17, 2019
Published online: Dec 20, 2019
Published in print: Mar 1, 2020
Discussion open until: May 20, 2020
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