混凝土三点弯曲试样K_(ΙC)的计算公式研究  

A Study on the Formulae to Test K_(ΙC) in Three-point Concrete Bending Beams

作　　者：郑光俊[1] 朱为玄[1] 徐道远[1] 

机构地区：[1]河海大学土木工程学院,江苏南京210098

出　　处：《淮海工学院学报（自然科学版）》2004年第2期67-70,共4页Journal of Huaihai Institute of Technology:Natural Sciences Edition

摘　　要：在用直三点弯曲试验测试混凝土断裂韧度 KΙC时 ,分别有陈篪提出的和美国材料试验协会( ASTM)推荐的公式可用 ,二者究竟有多大差异是人们关注的问题。正在编制的《水工混凝土断裂试验规程》是我国第一个混凝土断裂试验规程 ,其中也涉及到选用哪个公式的问题。用直三点弯曲试验所得的试验数据进行比较 ,分析了二者的差异 ,然后用数学软件 Matlab进行函数图像分析 ,进一步讨论了两个公式的差异性问题 ,从而得出在 aW∈ ( 0 .4,0 .6)Two formulae can be used to calculate the fracture toughness K_ ΙC of three-point concrete beams, namely the one put forward by Prof. Chen Chi and the one recommended by the American Society for Testing Materials(ASTM). What is the difference between them and which one shall we choose? People have long been concerned about it. This is also a problem that the first fracture test specifications in China, The Fracture Test Specifications for Concrete in Engineering Hydraulic, are faced up with. Experiment data obtained from three-point bending tests and the mathematics software Matlab are used to compare their difference in this paper. It is concluded that the discrepancy between these two is negligible when aW varies from 0.4 to 0.6.

关 键 词：混凝土 断裂韧度KIC 直三点弯曲 计算公式 

分 类 号：TU528[建筑科学—建筑技术科学] TV431[水利工程—水工结构工程]