三点弯曲试件混凝土K_(IC)尺寸效应公式的修正  

Modification of size effect formula of fracture toughness of concrete for three-point bending specimens

作　　者：曹亮[1] 王向东[1] 

机构地区：[1]河海大学土木工程学院

出　　处：《河海大学学报（自然科学版）》2007年第1期63-66,共4页Journal of Hohai University(Natural Sciences)

摘　　要：混凝土裂缝前缘存在断裂过程区,以往研究混凝土断裂韧度KIC尺寸效应时未考虑断裂过程区的影响.为此,基于Weibull脆性破坏统计理论,在考虑混凝土裂缝亚临界扩展条件的基础上对三点弯曲试件混凝土KIC尺寸效应换算公式进行了修正,并通过一组试验数据得到了便于工程应用的KIC尺寸效应换算公式的近似表达式.In the previous study on the size effect of fracture toughness of concrete, the influences of fracture process zones, which occur at the front edge of concrete cracks, axe not taken into account. In consideration of the above fact, the size effect formula for fracture toughness Kic of three-point bending concrete specimens was modified based on the WeibuU statistical theory with sub-critical expansion of concrete cracks taken into account. Moreover, an approximate expression for the formula of fracture toughness convenient for engineering application was deduced based on a set of experimental data.

关 键 词：混凝土 三点弯曲试件 断裂韧度 尺寸效应 断裂过程区 

分 类 号：TV624.4[水利工程—水利水电工程]