钢筋混凝土构件率相关恢复力模型研究

Study on the Rate-dependent Restoring Force Model for RC Members

通过钢筋混凝土构件的动态试验,研究不同加载速率下的钢筋混凝土梁柱力学特性。考虑屈服强度、极限强度和刚度的动力效应,引入损伤因子,并考虑混凝土损伤对卸载刚度的影响,建立了钢筋混凝土构件率相关的三折线恢复力模型。利用有限元分析软件模拟钢筋混凝土构件的动态试验,对比模拟结果与试验结果得出:考虑应变率效应和混凝土损伤对卸载刚度的影响,能够更好地反映构件的动力特性。对一平面框架结构模型进行不同加载速率下的动态分析,研究加载速率对结构动力反应的影响,结果表明,随着加载速率的增大,结构模型各构件的强度和刚度增大,结构模型整体抗侧移刚度增强,水平位移减小。

According to the dynamic experimental results of RC（reinforced concrete）members, the mechanical properties at different loading rates were studied.Based on experimental results, the tri-linear restoring force model of RC members,which took into account the loading rate effect and stiffness degradation caused by the damage of concrete,was developed.Then the dynamic experiment of RC members was simulated using the finite element analysis software and the results were compared with those obtained in experiments.Results show that the rate-dependent model,taken into account the loading rates effect and stiffness degradation,could preferably reflect the dynamic behaviors of RC members.Finally,aplane frame model was analyzed at different loading rates to study the effect of loading rates on the dynamic response of structures.It was shown that,with the increasing of loading rates,the strength and stiffness of members and the lateral stiffness of the whole structure model increased.As a result,the horizontal and story displacements of the RC model were reduced with the increase of loading rates.