混凝土Ⅰ-Ⅱ复合型裂纹断裂准则研究方法概述

ADVANCES IN FRACTURE CRITERIA OF MIXED MODEL FRACTURE IN CONCRETE

I—II复合型断裂是混凝土断裂中最常见的一种形式．断裂力学基本上有两种分析裂缝稳定性的方法:应力强度因子法和能量法,在混凝土断裂性能的描述上两者应该是等效的．本文介绍了不同种断裂准则的基本假定、判别标准、适用范围,并与实际试验结果相比较,指出各种断裂准则的优缺点．

Mixed-model fracture is a prevailing phenomena in concrete. At present, there are two main approaches in describing the fracture behavior of concrete structures： One using stress intensity factor（SIF） as the main fracture parameter, and the other being energy based. Theoretically, these two methods should be consistent with each other. The basic assumptions, standards and application ranges of different fracture criteria are discussed. Furthermore, by comparing results in tests, the merits and demerits of different fracture criteria are discussed.