不同轴压比RCS梁柱组合件恢复力模型研究

以6个1/2模型RCS梁柱节点拟静力试验为基础，研究不同轴压比下RCS组合件的滞回性能。试验结果表明:梁铰破坏时试件的滞回曲线饱满，耗能能力优于构造破坏；随着轴压比的增大，试件滞回环愈加丰满，初始刚度有所增加，承载力有所增大；随着加载位移的增加，刚度退化速率变慢，且梁铰破坏时随着轴压比增大，刚度退化速率变大。基于试验结果和现有恢复力模型理论，建立的三折线骨架曲线模型与实际试验骨架曲线具有较高的吻合度，能较好的反映轴压比对其滞回特性的影响，可为该RCS梁柱组合件的弹塑性分析及工程应用提供参考。

Research on restoring force model of RCS beam-column assembly with different axial compression ratios

Based on the pseudo-static test of six 1/2 scale RCS beam-column joints, the hysteretic performance of RCS assemblies under different axial compression ratios is studied. The test results show that when the beam hinge fails, the hysteresis curve of the specimen is plump, and the energy dissipation capacity is better than that of structural failure. With the increase of the axial compression ratio, the specimen present more plump hysteretic loops, a larger initial stiffness and a higher bearing capacity. As the loading displacement increases, the stiffness degradation rate becomes smaller. When the beam hinge fails, the stiffness degradation rate becomes larger as the axial compression ratio increases. Based on the test results and the existing restoring force model theory, the skeleton curve from the established three-fold line model matches reasonably well with that from the test. The proposed skeleton curve model can well reflect the influence of the axial compression ratio on its hysteresis characteristics, and provide references for the elastic-plastic analysis and engineering application of beam-column assemblies.