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发布时间：2019-03-11

论文类型：会议论文

发表时间：2012-01-01

收录刊物：Scopus、CPCI-S

页面范围：1039-1045

关键字：Buckling-restrained brace; angle steel; global buckling; brace end rotation; end bending moment

摘要：Steel angle buckling-restrained braces (ABRBs) are a novel type of all-steel buckling-restrained braces (BRBs) that enable easy control on the initial geometric imperfection of the steel core, more design flexibility in the buckling restraining mechanism, and easy assembly. Component tests of five reduced-scale ABRB specimens with pinned connections were conducted to investigate their global stability, in which the effect of brace end rotation, gap between the core and the casing, and the stiffness ratio P-e/P-yc were considered. The test results showed that premature global buckling still occurred even though the stiffness ratio, P-e/P-yc, was greater than 1.5, indicating that this commonly used stiffness requirement to prevent global buckling of BRBs may not be conservative for pin-connected BRBs. Two rotation modes, namely the C-mode and S-mode, were observed in the test, and it was found that the C-mode end rotation with a single curvature bending configuration was not favorable for the global stability of BRBs. The specimens with S-mode end rotation, which had a reverse curvature bending configuration, demonstrated good brace ductility and energy dissipation capacity before global buckling occurred. Several design implications for the global stability of BRBs are presented, and it is suggested that the effect of end bending moment in the casing induced by end rotation should be considered in the global stability design of BRBs.