| 英文摘要 |
Experimental results indicate that global stability of buckling-restrained braces (BRBs) and gusset connections is critical to the seismic performance of buckling-restrained braced frames (BRBFs). This study presents experimental results testing a simplified analytical method that has been developed to incorporate the concept of a notional load and the flexural effects of the restrainer in assessing the global stability of a welded-end BRB and its connection. Cyclic loading tests on four full-scale BRBs with varying steel casing sizes and gusset connection stiffnesses were performed with various initial imperfections and out-of-plane (OOP) drifts to demonstrate the effectiveness of the proposed method. Test results confirm that the effects of the initial imperfection, OOP drift, and gusset edge stiffener on the BRB buckling strength can be satisfactorily predicted. It is concluded that the global stability is vulnerable to the OOP drift and adequately stiffening the gusset is recommended in BRB applications. |
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