Experimental Investigation of the Hysteretic Performance of Dual-Tube Self-Centering Buckling-Restrained Braces with Composite Tendons
Publication: Journal of Composites for Construction
Volume 19, Issue 6
Abstract
This paper presents the results of experimental testing a novel dual-tube self-centering buckling-restrained brace (SC-BRB) with pretensioned basalt fiber-reinforced polymer (BFRP) composite tendons. Cyclic tensile experiments are first conducted on two sets of BFRP tendons with different diameters. The results confirm that the BFRP tendons have a stable cyclic elastic modulus and sufficient elongation capacity, making them suitable for use as the self-centering tendons in SC-BRBs. Quasi-static experiments are performed using two dual-tube SC-BRB specimens with different core plate areas. Before the failure of the self-centering system, both specimens stably exhibit the expected flag-shaped hysteresis response, with a relatively small residual deformation. The internal forces in the BFRP tendons and the gaps between the tubes and the end plates are measured to validate the performance of the self-centering system. Both specimens meet the requirements for ultimate ductility and cumulative ductility in braces. For a similar initial pretension, a greater core plate area results in greater residual deformation; however, the cumulative energy dissipation and the equivalent viscous damping are also greater.
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Acknowledgments
The research described in this paper was sponsored by National Natural Science Foundation of China (51208095), Qing Lan Project of Jiangsu Province and The Fundamental Research Funds for the Central Universities (3205003203). The supports are gratefully acknowledged.
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Journal of Composites for Construction
Volume 19 • Issue 6 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 22, 2014
Accepted: Jan 2, 2015
Published online: Feb 20, 2015
Discussion open until: Jul 20, 2015
Published in print: Dec 1, 2015
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