混凝土Ⅰ型裂缝动静力损伤断裂分析

STATIC AND DYNAMIC DAMAGE FRACTURE ANALYSIS OF MODE I CRACK IN CONCRETE

本文首先将文[3]给出的混凝土静力损伤本构方程推广到动力损伤本构方程上,进而根据损伤力学的应变等价性原理,推出了混凝土Ⅰ型裂缝在动静荷载作用下缝端附近的损伤场,最后提出了用于判断裂缝稳定性的“允许损伤尺度”概念,实现了损伤与断裂的耦合分析,为把损伤理论应用到混凝土断裂力学中提供了一个新的途径。

In this paper, first, a dynamic constitutive equation of concrete is extended from the static counter part presented in reference[3]. Second, according to the strain-equivalent principle, the damage field near the crack tip of mode I in concrete is derived under both static and dynamic loading. Finally, based on the concept of 'permissable damage scale'. which serves as a criterion for evaluating crack stability, the analysis of coupling the concepts of damage and fracture can be realized. The idea presented in this paper provides a new approach for analyzing the fracture problems of concrete using damage theory.