钢梁-混凝土柱单剪板连接节点的抗震性能

Anti-seismic performance of single plate shear connection between steel beam and reinforced concrete column

对3个钢梁-混凝土柱单剪板连接节点进行低周反复荷载加载试验,探讨螺栓配置和锚筋数量对其破坏形态和极限承载力等受力性能的影响.结果表明:钢梁-混凝土柱单剪板连接节点具有良好的抗震性能,3个节点试件的位移延性系数为5.5～6.0,符合抗震设计的延性要求.在最大荷载时,3个试件的等效黏滞阻尼系数为0.32～0.37,耗能能力强.高强螺栓群的嵌固作用使得节点能承受一定的弯矩.设计钢梁-混凝土柱单剪板连接节点的预埋件时,忽略节点的约束弯矩将导致节点存在安全隐患,降低结构的抗震性能.因此设计锚筋时,应同时考虑弯矩、剪力和轴力的共同作用.

Three single plate shear connections between steel beam and reinforced concrete （RC） column were tested under low-cycle reciprocal loading. The investigation mainly focused on the influence of the bolt and the anchor bar on the failure mode, the ultimate load and other bearing performance. Results showed that single plate shear connections between the steel beam and the RC column had fine anti-seismic performance. The ductility factors of the three specimen joints were 5.5 - 6.0, thus meeting the requirement of the ductile frame in anti-seismic design, and their equivalent viscous damping coefficients at the maximum load were 0.32 -0.37, indicating the energy dissipation was indicated to quite high. Because of the fixed effect of high-strength bolt group, the joints could act as a semi-rigid connection. It would be the hidden trouble to decrease anti-seismic performance to neglect constraining moment in designing embedded anchorage. Thus, the moment, the shear, and the axial load should be all together considered in design of the single plate shear connection between the steel beam and the RC column, in particular for anchorage reinforcement.