混凝土两相不均质模型断裂机理的初步分析  

The Analysis of Fracture Mechanism for Two-Phase of Model Concrete

作　　者：王波[1] 李国润[1] 赵兴义 

机构地区：[1]成都科技大学水电学院水利工程系

出　　处：《成都科技大学学报》1989年第1期79-86,共8页

基　　金：教育部科学基金资助课题

摘　　要：本文以试验为基础,讨论了两相不均质模型的断裂。对模型的裂缝起裂和开展进行了描述和分析。认识到混凝土局部的结构特征对于探讨其破坏过程和断裂机理是很重要的。骨料相的存在使基相中的裂缝起裂容易了,骨料离裂缝尖端越近,这种影响越显著,但裂缝的进一步发展又受到骨料的阻碍。局部的裂缝发展是伴随裂缝型式(Ⅰ型张开、Ⅱ型剪开)的不断复合和转化,不均质性对裂缝发展的阻止作用也是随之变化的。由此分析,对混凝土的断裂机理也有了进一步的认识。The fracture mechanism of heterogenous(two-phase)model of concrete is discussed on the basis of the test results.The crack initiation and propa- agation in this model are explained and analyzed.It has been found that the LOCAL aggregate characteristic features are important in the cracking process and mechanism of fracture.Because of the presence of aggregate, the crack initiation is easier than in the matrix,and the shorter the dista- nce of the aggregate from the crack tip,the more significant this effect. The crack propagation,however,may be arrested by the aggregat.The LOCAL crack propagation can be a process of change of the crack types (openong Ⅰ;shear Ⅱ mode).

关 键 词：混凝土 断裂机理 两相模型 

分 类 号：TU371.3[建筑科学—结构工程]