混凝土正交各向异性动态损伤本构模型研究

摘要

In order to establish orthotropic dynamic damage constitutive model for concrete, dynamic increase factors (DIF) were introduced for considering strain effects. Based on Sidoroffs energy equivalent theory, the dynamic damage elasticity matrix of elements was founded. Mazars' damage model was used for calculating damage scalars in principle axial directions, orthotropic Hoffman failure criteria was adopted, and the modification of strength due to damage and dynamic increase factor was considered. The model was verified by a destroying experiment of a structure under blasting vibration.%为建立混凝土的正交各向异性动态损伤本构,首先采用动力放大系数的形式考虑材料的应变率效应,然后基于Sidoroff能量等价原理,建立动态条件下单元体的损伤刚度矩阵.同时在损伤演化模型中,采用Mazars损伤模型描述主轴方向的损伤变最.另外采用适用于正交各向异性的Hoffman屈服破坏准则,并考虑损伤及动力放大系数对强度的修正.以建筑结构受爆破震动荷载作用的实验资料,对本模型进行验证.