不同轴压比带楼板RCS梁柱组合件恢复力模型

Restoring force model of RCS beam column assemblies with floor slab under different axial compression ratio

基于6个1/2模型的端板-螺栓连接RCS组合结构带楼板梁柱组合件的拟静力试验,研究在不同轴压比下RCS组合件的滞回性能。通过对试件破坏过程及应力-应变曲线的分析,建立符合RCS组合结构梁柱组合件的恢复力模型。研究结果表明:6个试件最终破坏模式均为梁铰破坏,混凝土板破坏严重,混凝土柱仅在柱端出现轻微裂缝。文中提出了RCS组合件特征点的相关理论计算公式,由此建立的三折线骨架曲线模型与实际试验骨架曲线吻合较好;6个试件滞回曲线均出现轻微的捏拢,文章通过引入带捏缩效应的滞回规则能够较好的反映该现象;通过所建立的滞回规则绘制的计算滞回曲线与试验滞回曲线具有较高的吻合度,可为该类型带楼板RCS梁柱组合件地震反应分析提供参考。

Based on the quasi-static test of six 1/2-model end plate bolted RCS composite structure with floor slab,the recovery performance of RCS assemblies under different axial compression ratios is studied.Based on the analysis of the failure process and stress-strain curve of the specimen,the restoring force model of RCS beam-column composite is established.The results show that:all the specimens were damaged by beam hinge,the concrete slab was damaged seriously,and only slight cracks were found at the end of concrete column.The theoretical calculation formula of the characteristic point of the RCS assembly is put forward,and the trine fold skeleton curve model established by this method is in good agreement with the experimental skeleton curve.All the hysteresis curves are slightly pinched,which can be better reflected by introducing the hysteresis rule with pinching effect;the experimental hysteresis curve is in good agreement with the calculation,which can provide a reference for the seismic response analysis of this type of RCS beam column assembly.