首页|Flexural Demand on Pin-Connected Buckling-Restrained Braces and Design Recommendations
Flexural Demand on Pin-Connected Buckling-Restrained Braces and Design Recommendations
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NETL
NSTL
Asce-Amer Soc Civil Engineers
In a previous study by the authors, the cyclic behavior of a novel type of pin-connected angle steel buckling-restrained brace (ABRB) was examined, and the failure mechanism in the core projection of the ABRB induced by an excessive bending effect caused by end rotation was discussed. In this paper, the occurrence mechanism of end rotation modes and the bending effect in the core projection of an ABRB are first investigated based on the previous test results, which shows that end rotation demands would be significantly increased with the presence of a gap and an additional bending effect could be observed if the end rotation demands were large enough to cause two-point contact at the core ends. Then, a new method to predict the flexural demand on pin-connected BRBs is proposed by considering the effect of the end rotation modes, clearance, initial eccentricity, and initial deflection of casing. The design criteria to prevent yielding of the core projection are presented and further verified by the previous test results. Furthermore, the effects of key influential parameters on the flexural demand on core projection are discussed based on the analytical results. It is found that such a bending effect can be significantly reduced by decreasing the gap or increasing the constrained length of the core stiffening segment. The C-mode end rotation with single curvature bending configuration is found to be generally the most unfavorable case for core projection design. Finally, several design recommendations are provided for pin-connected BRBs.
buckling-restrained bracepinned connectioncore projectionbrace end rotationtwo-point contactflexural demand
Junxian Zhao、Bin Wu、Jinping Ou
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State Key Laboratory of Subtropical Building Science, South China Univ. of Technology, Guangzhou 510641, People's Republic of China
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China
School of Civil and Hydraulic Engineering, Dalian Univ. of Technology, Dalian 116024, People's Republic of China
NETL
NSTL
Asce-Amer Soc Civil Engineers
