基于混凝土损伤弹性本构的Ⅱ型断裂判据

Fracture Criterion for Mode Ⅱ Crack Based on Damage Elastic Constitutive Relation of Concrete

以混凝土单轴拉压损伤为基础,把损伤理论引入混凝土的断裂分析中,给出受力单元弹性损伤本构关系,分析混凝土损伤的临界值,定义有效应力强度因子;推导出Ⅱ型裂纹损伤新的断裂依据,实现了断裂力学与损伤的有机结合;为混凝土的损伤断裂研究提供判据,也为混凝土结构的设计与维护提供理论依据.

Based on the study of damage mechanism of concrete material subjected to uniaxial tensile and compressive stress, the damage theory is inducted into the concrete fracture analysis and the elastic constitutive relation of damage for concrete element is presented. This paper analyses the critical value of concrete damage, and defines the effective stress intensity factor and then the new mode Ⅱ crack damage fracture criterion is deduced. So the combination of fracture mechanics and damage is achieved. It presents new criteria about the concrete damage fracture study and the designation and maintenance of the concrete structures.