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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >A novel type of angle steel buckling-restrained brace: Cyclic behavior and failure mechanism
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A novel type of angle steel buckling-restrained brace: Cyclic behavior and failure mechanism

机译：一种新型的角钢屈曲约束支撑：循环行为与破坏机理

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摘要

A novel type of angle steel buckling-restrained brace (ABRB) has been developed for easier control on initial geometric imperfection in the core, more design flexibility in the buckling restraining mechanism and easier assembly work. The steel core is composed of four angle steels to form a non-welded cruciform shape restrained by two external angle steels, which are welded longitudinally to form an external tube. Component test was conducted on seven ABRB specimens under uniaxial quasi-static cyclic loading. The test results reveal that the consistency between the actual and design behavior of ABRB can be well achieved without the effect of weld in the core. The ABRBs with proper details exhibited stable cyclic behavior and satisfactory cumulative plastic ductility capacity, so that they can serve as effective hysteretic dampers. However, compression-flexure failure at the steel core projection was found to be the primary failure mode for the ABRBs with hinge connections even though the cross-section of the core projection was reinforced two times that of the yielding segment. The failure mechanism is further discussed by investigating the N_u-M_u correlation curve. It is found that the bending moment response developed in the core projection induced by end rotation was the main cause for such a failure mode, and it is suggested that core projection should be kept within elastic stage under the possible maximum axial load and bending moment response.
机译：已开发出一种新型的角钢屈曲约束支撑（ABRB），以更轻松地控制铁心的初始几何缺陷，在屈曲抑制机构中提供更多的设计灵活性并简化组装工作。钢芯由四块角钢组成，形成受两个外角钢约束的非焊接十字形，将其纵向焊接以形成外管。对七个ABRB标本在单轴准静态循环载荷下进行了组件测试。测试结果表明，在没有铁心焊接影响的情况下，可以很好地实现ABRB的实际行为与设计行为之间的一致性。具有适当细节的ABRB表现出稳定的循环行为和令人满意的累积塑性延展性，因此它们可以用作有效的滞后阻尼器。但是，发现钢芯突出部的压缩弯曲破坏是铰链连接的ABRB的主要破坏方式，即使芯突出部的横截面被加固了屈服段的两倍。通过研究N_u-M_u相关曲线进一步讨论了失效机理。研究发现，端部旋转引起的芯部突起中产生的弯矩响应是这种破坏模式的主要原因，建议在可能的最大轴向载荷和弯矩响应下，将芯部突起保持在弹性阶段内。 。

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