碾压混凝土内时损伤本构模型

本文应用内时理论和损伤力学建立了碾压混凝土压剪及压压剪状态下的内时损伤本构模型。其特点是：混凝土的弹塑性特性由内时理论描述，而破坏由损伤力学来描述。前者使本构模型摆脱了一般弹塑性中屈服面的概念，从而简化了非线性计算过程；后者使微裂纹引起的软化、体积膨胀等都可由损伤变量来考虑；从而既反映了混凝土的本质特性，又使模型的参数和基本方程大大减少。应用本文建议的模型分析碾压混凝土压剪及压压剪状态剪应力－应变关系，所得计算结果与试验数据相符合，可作为碾压混凝土重力及拱坝设计的依据。

ENDOCHRONIC DAMAGE CONSTITUTIVE MODEL FOR ROLLER COMPACTED CONCRETE

An endochronic damage constitutive model is proposed. The characteristics of the model are that the elasto-plastic properties and internal defects of concrete are described by endochronic theory and damage mechanics respectively, so that the concept of yield surface is not needed. The number of parameters is reduced significantly in the model which makes the model more applicable to engineering practice. The proposed model is used to analyze deformation and strength of roller compacted concrete specimens. The calculating results are in good agreement with experimental data, which can be used as guidance for RCC gravity and arch dam construction.