自密实混凝土加固框架节点恢复力模型

Restoring force model of frame joints strengthened by self-compacting concrete

基于10个足尺自密实混凝土加固框架节点的拟静力试验结果,分析了不同初始受力、不同初始轴压比及不同界面处理方式的加固节点的滞回特性。考虑刚度退化的影响,提出自密实混凝土加固框架节点的三线型恢复力模型,并给出了恢复力模型的表达式。结合试验结果,对恢复力模型的有效性进行了验证。结果表明,增大截面法加固框架节点的抗震性能相对于对比构件有明显的提高,所建立的恢复力模型骨架曲线与试验值吻合较好,此模型可用于自密实混凝土框架加固节点的弹塑性动力反应分析及其节点的抗震加固设计。

Based on the quasi-static test results of 10 full-scale frame joints strengthened by self-compacting concrete,the hysteretic behavior of strengthened joints under different initial force,different initial axial compression ratio and different interface treatments were investigated. Considering the stiffness degradation,the tri-linear restoring force model of frame joints strengthened by self-compacting concrete was proposed,and the expression of restoring force model was given. Combined with the test results,the effectiveness of the restoring force model was validated. The results showed that the seismic performance of the frame joints strengthened by self-compacting concrete was more effective. The skeleton curve of proposed restoring force model was very close to the experimental values,and this model can be use to analyze the elastic-plastic dynamic response of frame joints strengthened by self-compacting concrete and the seismic strengthening design.