剪切机制耗能端板螺栓连接组合联肢剪力墙钢连梁抗震性能试验研究

Seismic behavior of shear dominant bolted endplate steel coupling beam of composite coupled shear wall

将端板螺栓连接构造引入钢-混组合联肢剪力墙中,用于连接钢连梁与混凝土墙肢。设计并制作了1组(2个)小剪跨比连梁双肢组合剪力墙试件,分别采用端板螺栓连接和传统直插式的连梁-墙肢连接构造形式,进行低周往复加载试验,以研究两种连接构造形式下钢连梁与混凝土墙肢连接试件的滞回性能、刚度与承载力退化特征以及破坏模式。试验结果表明:用端板螺栓连接代替直插式连接构造,能够有效减轻钢连梁-墙体连接区域混凝土损伤程度,屈服后非线性变形主要集中在钢连梁端部,且钢连梁能够达到美国AISC 341-05规范要求的0.08 rad非线性转角限值,充分发挥滞回耗能作用,刚度、承载力退化不明显,延性好,与传统直插式钢连梁-墙肢连接具有相同甚至更好的抗震性能。

In this study the bolted walls. A pair of small scale corn reversed loading to investigate the endplate connection was introduced into the steel-concrete composite coupled shear posite coupled shear wall specimens were fabricated and tested under low cycle hysteretic behavior, degradations of strength and stiffness and failure patterns of composite connection regions. Test resuhs indicate that by replacing the direct embedment connection with bolted endplate connection, the damage to concrete in the coupling beam-wall pier connection region can be significantly reduced. The post-yield deformation xnainly concentrate at beam ends. And the bolted endplate connected coupling beam can achieve an inelastic rotation angle up to 0.08 rad. The energy dissipation capacity of steel coupling beam through inelastic shear deformation can be developed. Load transfer at the connection region is smooth and rational The degradation of strength and stiffness is insignificant. The bolted endplate coupling beam-wall pier connection can be designed to be as good as the conventional direct embedment connection in seismic performance.