一种修正的混凝土弹性损伤本构模型及其应用  

A MODIFIED ELASTIC DAMAGE CONSTITUTIVE MODEL OF CONCRETE AND ITS APPLICATIONS

作　　者：李正[1,2] 李忠献[1,2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072

出　　处：《工程力学》2011年第8期145-150,共6页Engineering Mechanics

基　　金：国家自然科学基金重大研究计划"重大工程的动力灾变"重点支持项目(90715032;90815025)

摘　　要：混凝土弹性损伤本构模型的模型参数少、标定简单、计算效率较高,适于工程应用。Faria和Oliver等人所提出的混凝土损伤模型,体现了混凝土弹性损伤本构模型的上述优点,但原模型对反复荷载作用下混凝土刚度恢复效应描述欠佳。针对此不足,该文做了修正。并以ABAQUS为平台编制了材料模型子程序UMAT。应用修正的模型对几个典型实验进行了数值模拟,分析结果表明:修正的混凝土弹性损伤模型,能够较合理地描述反复荷载作用下混凝土的受拉行为,且计算效率高、适用性好,是钢筋混凝土结构损伤分析的一种可靠、适用的材料模型。Elastic damage models have few model parameters, which may be calibrated easily, and have a high computational efficiency. Thusly, they are suitable for engineering application. The elastic damage constitutive model of concrete proposed by Faria and Oliver et al is modified to overcome the shortcomings of the original model for describing the stiffness restoring effect of concrete under cyclic loading, and a material model subroutine UMAT is developed taking ABAQUS as the platform. Several typical tests are numerically simulated using the modified model, and the results show that the computational efficiency of the modified model is high and the simulated results are well agreed with the test data. A conclusion is given that the modified damage model may describe the tensile behavior of concrete under cyclic loading more reasonably with high computational efficiency and good applicability, and is a reliable and applicable material model for the damage analysis of reinforced concrete （RC） structures.

关 键 词：混凝土 弹性损伤本构模型 修正模型 损伤分析 数值模拟 

分 类 号：TU313[建筑科学—结构工程]