面向纤维单元的钢筋混凝土材料滞回本构模型开发  

Development of Hysteretic Constitutive Model of Reinforcing Bar and Concrete for Fiber Element Model

作　　者：刘军 赵晶 王德斌 张吉松 LIU Jun;ZHAO Jing;WANG Debin;ZHANG Jisong(School of Civil Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2021年第3期71-76,共6页Journal of Dalian Jiaotong University

基　　金：辽宁省自然科学基金资助项目(20180550380);辽宁省教育厅科学研究计划资助项目(JDL2017009)。

摘　　要：采用纤维单元模型进行工程结构地震非线性分析,建立精确的材料单轴滞回本构关系,并开发有效的数值计算工具.采用Hoshikuma提出的考虑箍筋约束效应的骨架曲线,通过修正Yassin加卸载滞回规则、引入损伤变量和压-拉转换刚度退化因子建立混凝土材料的滞回本构模型;钢筋材料采用经典的Menegotto-Pinto模型.利用FORTRAN语言开发了混凝土和钢筋单轴本构模型隐式算法子程序.以NSCP程序为平台,通过材料子程序接口,将其植入到主程序中.在材料及结构层次上分别进行数值模拟,并与试验结果进行对比.结果表明,所提出的材料本构模型适用于模拟分析钢筋混凝土结构进入弹塑性状态后的非线性行为,所开发的材料模型子程序具有满足工程需要的计算精度.For nonlinear analysis of engineering structure earthquake by fiber element model, an accurate uniaxial hysteretic constitutive relationship of material and an effective numerical calculation program was developed. The enveloped curve with stirrup restraint effect by Hoshikuma was used to construct the concrete hysteretic constitutive model, and Yassin hysteresis rules for loading and unloading were modified. Damage valuable and degradation factor of stiffness during compression to tension transformation were induced, and Classic Menegotto-Pinto model was used for constitutive model of the steel bar. Implicit algorithm subroutine of uniaxial constitutive model of reinforcing bar and concrete was developed by FORTRAN coding. These subroutines are embedded into the NCPS main program through the interface of material subroutine modules. Digital simulations of three layers including materials, elements and structures were conducted by using this model. Compared with the experiment results, simulated results show good correlation, which suggests that this model is suitable for simulating the nonlinear behavior of the reinforced concrete structure after entering the elastoplastic stage, and the material subroutine can satisfy the required engineering accuracy.

关 键 词：钢筋 混凝土 滞回本构模型 纤维单元 抗震分析 

分 类 号：TU375[建筑科学—结构工程]