考虑震损的混凝土框架结构改进建模方法

Modified modeling method for RC frame structures considering earthquake damage

为准确描述震后结构损伤的影响,提出了损伤构件的定量分析方法及震损结构的改进建模方法.首先,从骨架曲线退化及滞回规则退化两方面定义了损伤构件的性能退化指数;然后,基于Park-Ang模型与Kunnath模型,采用统计回归分析方法提出了损伤构件恢复力模型,并对其准确性进行了验证;最后,应用该恢复力模型对震损框架结构进行弹塑性分析.结果表明:采用Park-Ang模型和Kunnath模型得到的损伤构件恢复力模型均具有较高的准确性;对于所研究的2种构件,滞回曲线力峰值的理论值和试验值误差均小于10%;向完好结构输入组合地震波,向震损结构输入单一地震波,各层位移时程曲线吻合良好,说明采用该恢复力模型进行震损结构建模能够准确分析震损程度及分布对结构抗震性能的影响.

To describe the effects of earthquake-damaged structures accurately,the quantitative analysis method for damaged members and an improved modeling method for earthquake-damaged structures were proposed.Firstly,the performance degradation indices of the damaged members were defined from the aspects of the backbone curve and the hysteretic rule.Then,the resilience models for the damaged reinforced-concrete(RC)members based on the Park-Ang model and the Kunnath model were built respectively by using statistical regression analysis method,and the accuracies of the resilience models were verified.Finally,the elasto-plastic analysis of the earthquake-damaged frame was carried out by using the resilience models.The results show that the resilience models for the damage members obtained by the Park-Ang model and the Kunnath model have high accuracy.For the two types of members studied,the errors between the peak forces of the theoretical hysteresis curves and those of the experimental hysteresis curves are less than 10%.Applying combined seismic waves to the intact structural model and single seismic waves to the damaged structural model,the displacement time history curves of each floor are in good agreement,showing that the influence of the level and distribution of earthquake damage on structural anti-earthquake performance can be accurately analyzed by using these resilience models to establish earthquake-damaged structures.