基于改进IMK滞回规则的弯矩曲率退化模型研究  

Study on deteriorating moment-curvature model based on modified Ibarra-Medina-Krawinkler hysteretic rules

作　　者：刘赛 顾冬生[1] LIU Sai;GU Dongsheng(School of Environment and Civil Engineering,Jiangnan University,Wuxi Jiangsu 214122,P.R.China)

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122

出　　处：《重庆大学学报》2021年第1期106-118,共13页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(51709129);江苏省自然科学基金资助项目(BK20131105)。

摘　　要：提出一种基于改进IMK(Modified Ibarra-Medina-Krawinkler,ModIMK)滞回规则的RC柱弯矩曲率模型,并用于定义OpenSees中Beam With Hinges单元塑性铰区的截面。提出的RC柱截面弯矩曲率骨架曲线为三折线模型,给出了骨架曲线关键点计算方法。对62根RC柱试验值与计算值进行统计分析发现,其对RC柱屈服位移和纵筋屈曲时的位移都能进行准确地预测。采用的ModIMK滞回规则能考虑强度和刚度退化,以此模拟在反复荷载下塑性铰区强度和刚度退化。对RC柱低周往复试验和振动台试验的数值模拟与分析结果表明,所建立的弯矩曲率模型结合塑性铰单元可准确地模拟RC柱在地震下的响应。Based on Modified Ibarra-Medina-Krawinkler(ModIMK)hysteretic rules,a new moment-curvature model is proposed in this paper,which can be used to define the section of plastic hinge zone of Beam With Hinges Element in OpenSees.The envelope curve of the moment-curvature model is idealized as tri-linear curve and equations that are capable of predicting the key points of skeleton curve are given.The accuracy of the model is calibrated by the test results of 62 RC columns,and it is found that both the yield displacement and longitudinal rebar buckling displacement can be well predicted.ModIMK hysteresis model can be used to simulate the degradation of the strength and stiffness in plastic hinge area under cyclic loading.The numerical simulations are conducted to model the columns tested by cyclic load and shaking table test,and the results show that the moment-curvature model in conjunction with plastical hinge element can accurately predict the response of RC columns under seismic loadings.

关 键 词：RC截面 弯矩曲率 塑性铰 ModIMK滞回 OPENSEES 

分 类 号：TU375.3[建筑科学—结构工程]