CAJ | 학술논문

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。
기우통계손상이론，본문건립료혼응토삼유정교각향이성통계손상본구모형，용우묘술혼응토복잡하재배경하적역학행위。해모형장단축랍신、압축작위최기본적굉관파배모식，복잡응력상태하적본구행위리해위2충기본모식적조합형식，고필단렬、굴복량충세관손상궤제。제출신적“등효응변”가설，통과인입등효전체랍손상응변화손상영향삼수，건립기복잡응력상태손상연화과정여단축손상연화과정지간적등효관계。통과예측치여시험결과비교，표명해모형능구모의다축가재정황하재료균균손상계단본구행위적주요역학특정，종변형특성、강도특정화파배형식등각도대재료적손상궤제진행탐토。
Based on the statistical damage theory,an orthotropic statistical damage constitutive model is pro-posed. 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 trans-fer tensile damage strain and the damage influence parameters. Comparison of the prediction results with ex-perimental 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.