混凝土弹塑性损伤本构模型参数及其工程应用  

Study of variables of elastic plastic damage model and its engineering application

作　　者：齐虎[1] 李云贵[1] 吕西林[2] 

机构地区：[1]中国建筑股份有限公司技术中心,北京101320 [2]同济大学结构工程与防灾研究所,上海200092

出　　处：《浙江大学学报（工学版）》2015年第3期547-554,563,共9页Journal of Zhejiang University：Engineering Science

基　　金：中建股份科技研发课题资助项目(CSCEC-2013-Z-2-1)

摘　　要：为提高弹塑性损伤本构模型的工程实用性,研究各参数取值对模型损伤发展、塑性发展及材料应力应变关系的影响.拟合参数取值与混凝土材料常用指标弹性模量、单轴抗压强度及单轴抗拉强度联系之间的函数关系,提出实用的参数取值确定方法.对规范规定的各强度混凝土材料进行数值模拟,结果表明:模型及参数确定方法能够较准确地模拟混凝土材料的各种非线性本构行为.采用用户材料子程序UMAT进行本构模型在ABAQUS中的二次开发,对上海某酒店项目进行数值模拟:在结构设计软件PKPM中完成建模,将模型转换为ABAQUS模型进行计算,并将计算结果与振动台试验结果进行比较.结果表明:各振形计算自振频率相差在5%以内,顶层位移时程除个别极值外总体匹配较好,楼层位移差在10%以内,最大层间位移除个别楼层相差达到30%以外,一般楼层相差10%左右,验证了所提出的参数确定方法及本构模型是合理有效的;通过分析结构各关键时刻损伤分布云图,表明弹塑性损伤本构模型能够实时反映结构的破坏过程,便于分析者直观地把握结构破坏形态.The variables of elastic plastic damage model was studied in order to improve the model＇s practicability specifically.The effect of different variables values on model damage development,plastic development and material stress-strain relations was studied.The function relationship was fitted by connecting the parameters with concrete material common indicators,including elastic modulus,uniaxial compressive strength.Uniaxial tensile strength and a practical variable value determination method was proposed.Results of numerical simulation of the different strength of concrete material specified by the code show that the model and its determining method can accurately simulate each nonlinear constitutive behavior of concrete material.The model was developed in ABAQUS via UMAT（user-defined material）and used to simulate a hotel project in Shanghai.The model was established in structural design software PKPM and converted into ABAQUS for calculation.Compared with that of the experiment with vibrating table,the result showed that the difference of natural vibration frequency was within 5%,and the displacement history of top layer fits well overall except some extreme value.the layer displacement was within 10% mostly except some individual extreme values up to 30%,which proved the reasonability of the variable value deter-mination method and constitutive model.Analysis results of the damage distribution pattern of structure at key time indicate that the elastic and plastic damage constitutive model can reflect the damage process in real time,which is convenient for analyzers to grasp the failure form of structure.

关 键 词：本构模型参数 混凝土 ABAQUS 非线性时程反应 损伤分布 

分 类 号：TU313[建筑科学—结构工程]