震损RC框架建模方法与剩余抗震能力评估  

Modeling method and residual seismic performance assessment of earthquake-damaged RC frame structures

作　　者：马高 刘欢 MA Gao;LIU Huan(College of Civil Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures(Hunan University),Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]工程结构损伤诊断湖南省重点实验室(湖南大学),长沙410082

出　　处：《建筑结构》2023年第13期13-20,共8页Building Structure

基　　金：湖南省创新平台与人才计划项目(2021RC3041);国家自然科学基金项目(52278498、51878268)。

摘　　要：为给震后损伤建筑的处理决策提供理论依据,对损伤RC框架结构剩余抗震能力展开研究。通过对大量RC柱的拟静力试验数据进行回归分析,提出考虑强度、刚度和延性退化的损伤塑性铰三折线恢复力模型的确定方法。基于OpenSees仿真平台,建立损伤程度逐渐增大的D1~D5框架的数值模型,分别选取基于结构易损性的倒塌储备系数CMR和基于能力谱的性能冗余率SPI作为量化震损结构抗震能力残余率的指标进行分析。结果表明:RC框架结构抗震能力的降低速率与损伤程度呈正相关;框架由中等损伤D3转变为严重损伤D4~D5时,CMR分别为完好结构的0.92、0.85和0.76,SPI的残余率R分别为0.85、0.72和0.47;易损性分析与性能冗余率分析这两种方法相比,易损性分析时采用的层间位移角限值实质为衡量完好结构的指标,而性能冗余率分析直接以承载力和变形能力降低的损伤结构的能力谱为基础,对抗震能力残余率的评估更加准确且计算更简便。In order to provide a theoretical basis for the treatment and decision of post-earthquake damaged buildings,the residual seismic capability of damaged reinforced concrete(RC)frame structures have been investigated.Based on the regression analysis of the pseudo-static test data of a large number of RC columns,a method for determining the three-fold restoring force model of the damaged plastic hinge considering the degradation of strength,stiffness and ductility was proposed.Based on the OpenSees simulation platform,the numerical models of the frames with increasing damage level from D1 to D5 were established.The collapse reserve coefficient CMR based on the structural fragility and performance redundancy rate SPI based on the capacity spectrum were selected to calculate the seismic capacity residual ratio of the structure with earthquake damage.The results show that the reduction rate of the seismic capability of the RC frame structure is positively correlated with the degree of damage.When the frame structural damage level varied from moderate damage D3 to severe damage D4~D5,the CMR is 0.92,0.85 and 0.76 of that of the undamaged structure,and the residual rate R of SPI is 0.85,0.72 and 0.47,respectively.Comparing the two methods of fragility analysis and performance redundancy rate analysis,the allowable value of inter-story drift ratio index used in the fragility analysis is essentially applicable to undamaged structure.While performance redundancy rate analysis is directly based on the capacity spectrum of damaged structures with reduced bearing capacity and deformation capacity,and the assessment of the seismic capacity residual ratio is more accurate and easier to calculate.

关 键 词：震损钢筋混凝土框架结构 剩余抗震能力 塑性铰模型 易损性 性能冗余率 

分 类 号：TU398.7[建筑科学—结构工程]