Development and Cyclic Tests of Cross-Anchored Dual-Core Self-Centering Sandwiched Buckling-Restrained Braces (SC-SBRBs)
Date Issued
2014
Date
2014
Author(s)
Tsai, Wen-Jing
Abstract
Self-Centering Brace (SCB) uses tendons to constrain steel compression member of the brace and provides self-centering properties under brace in tension and compression that is restored to zero residual deformation. Conventional dual-core SCB is two times brace deformation capacity than conventional single-core SCB under same strain of tendons (or reduce to half the additional strain of tendons under same brace deformation capacity) that effectively reduce the elastic strain demand of tendons.The Energy dissipating members experience serious wear, which reduces their energy dissipating efficiency and results in a need for replacement. Sandwiched Buckling-Restrained Brace (SBRB) uses two identical restraining members that sandwich the Energy Dissipative core with fully tensioned high-strength bolts to prevent core buckling and have stable hysteretic response. This study presents a cyclic behavior and self-centering behavior of Cross-Anchored Dual-Core Self-Centering Sandwiched Buckling- Restrained Brace (SC-SBRB). A SC-SBRB consists of a SBRB system, which provide energy dissipation, and self-centering system, which provide self-centering. The SC-SBRBs were Designed and tested two specimens (7490 mm long) with different member settings, tendons of two SC-SBRBs used same D16 mm steel strand. The objective was to compare the difference of seismic performance of SC-SBRBs. Test results indicate that the mechanism of SC-SBRBs is consistent with prediction. Under drift 2% of phase 1 test, two SC-SBRBs maintained good hysteretic response in self-centering behavior. Maximum brace strain of two SC-SBRBs were 1.1% corresponding to maximum tendons strain 0.80% and maximum load 1648 kN and 1705 kN, respectively. SBRB Systems can develop stable hysteretic responses up to a maximum core axial strain 1.5%, and cumulative plastic ductility 1090-1129 that is much higher than that specified the value of 200 in AISC seismic provisions (2010).
Subjects
Cross-Anchored Dual-Core Self-Centering Brace
Sandwiched Buckling-Restrained Brace
Type
thesis
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