混凝土正交各向异性统计损伤本构模型研究  

Orthotropic statistical damage constitutive model for concrete

作　　者：白卫峰[1] 张树珺[2] 管俊峰[1] 陈健云[3] 

机构地区：[1]华北水利水电大学,河南郑州450011 [2]南阳理工学院,河南南阳473004 [3]大连理工大学,辽宁大连116024

出　　处：《水利学报》2014年第5期607-618,共12页Journal of Hydraulic Engineering

基　　金：国家自然科学基金青年基金资助项目(51009020;51209094;51109029);水利部公益性行业科研专项经费项目(201301025);华北水利水电大学高层次人才科研启动项目(201109)

摘　　要：基于统计损伤理论,本文建立了混凝土三维正交各向异性统计损伤本构模型,用于描述混凝土复杂荷载环境下的力学行为。该模型将单轴拉伸、压缩作为最基本的宏观破坏模式,复杂应力状态下的本构行为理解为2种基本模式的组合形式,考虑断裂、屈服两种细观损伤机制。提出新的"等效应变"假设,通过引入等效传递拉损伤应变和损伤影响参数,建立起复杂应力状态损伤演化过程与单轴损伤演化过程之间的等效关系。通过预测值与试验结果比较,表明该模型能够模拟多轴加载情况下材料均匀损伤阶段本构行为的主要力学特征,从变形特性、强度特征和破坏形式等角度对材料的损伤机制进行探讨。Based on the statistical damage theory,an orthotropic statistical damage constitutive model is proposed. In this model, the constitutive behavior of concrete under complex stress state is regarded as the combination of uniaxial tension and uniaxial compression, which are considered as the most fundamental macro failure forms, and the two meso-scale damage modes, rupture and yield are considered. A novel equivalent strain hypothesis is proposed. The equivalent relations between the damage evolution process of complex stress state and uniaxial stress state are established,by introducing the concept of equivalent transfer tensile damage strain and the damage influence parameters. Comparison of the prediction results with experimental data shows that it can accurately predict the constitutive behavior in the uniform damage phase for concrete under multiaxial stress states. The damage mechanism is discussed from the view points of the deformation characteristics,strength properties and failure modes.

关 键 词：混凝土 多轴应力状态 统计损伤 本构模型 应力-应变曲线 

分 类 号：TU528.01[建筑科学—建筑技术科学]