具有宏观裂纹混凝土结构的起裂特性研究

具有宏观裂纹混凝土结构在荷载作用下裂纹是否会进一步扩展,是带裂纹工作的混凝土结构安全性能评价的重要课题.一方面要对混凝土结构应力状态进行现时观测与分析,另一方面要合理评价具有宏观裂纹混凝土结构的起裂特性.根据数批不同形式混凝土试件的试验结果,分析了混凝土起裂荷载/最大荷载、起裂韧度/断裂韧度与试件形式、相对初始缝长的关系,得出了一些有意义的结论.

STUDY ON INITIAL FRACTURE PROPERTIES OF CRACKED CONCRETE

The problem whether the cracks of concrete strucbe will continue to devlop is one of the most important topics in evaluating the safety of the structure. There are two ways to deal with this problem, One is to measure and analyze the load effect on site, and the other is to evaluae rationally the initial fracture toughnss of cmeked concrete- This paper studies the influences of the relative initial crack length and specimen confipotion on the ratio of initial hacbe towtess and hacture toughness, as well as the ratio of initial load and drimum load. Some valuable conclusions have been drown.