FRP增强混凝土框架节点恢复力模型

Restoring force model of concrete frame joints reinforced with FRP

为研究FRP增强混凝土梁柱节点及其组成框架结构的整体抗震性能,基于FRP增强混凝土梁柱节点的拟静力试验结果,分析了各类试验节点的滞回特性.考虑刚度退化的影响,提出FRP增强混凝土框架节点的三折线恢复力模型及其特征参数取值范围,并给出层间混杂FRP加固节点的恢复力模型表达式.结果表明,各类FRP加固节点的抗震性能相对于对比构件有明显的提高,相对而言层间混杂FRP的增强作用更为有效.所建立的恢复力模型骨架曲线与试验值非常接近,此模型可用于FRP增强混凝土框架结构的弹塑性动力反应分析及其节点的抗震加固设计.

In order to investigate the seismic performance of concrete beam-column joints strengthened by fiber reinforced plastics （FRP） and the corresponding frame structure, based on the pseudo-static test results of these joints, the hysteretic characteristics of the connections were analyzed. Considering the effect of stiffness degradation, a three lines restoring force model of concrete frame joints reinforced with FRP was proposed and ranges of the characteristic parameters were determined. The expression of restoring force model for joints strengthened by interply hybrid FRP was suggested. The results show that the seismic performance of the joints strengthened by FRP is increased evidently and reinforcement of interplay hybrid FRP is more effective. The framework curve of proposed restoring force model is very close to the test data. This model can be used to analyze the elastic-plastic dynamic response of concrete frame reinforced with FRP and the seismic strengthening design of its connections.