混凝土断裂能G_F的尺寸效应  

SIZE EFFECT OF FRACTURE ENERGY OF CONCRETE

作　　者：吴智敏[1] 赵国藩[1] 

机构地区：[1]大连理工大学

出　　处：《工业建筑》1995年第11期25-28,共4页Industrial Construction

摘　　要：断裂能ＧＦ是基于虚拟裂缝模型并考虑了混凝土软化特性的断裂参数，这个参数在混凝土的非线性开裂计算中是必不可少的．本文采用楔入劈拉法研究了试件高度对混凝土断裂能的影响．研究结果表明，ＧＦ在一定范围内存在尺寸效应．然而当试件高度ｈ＞５００ｃｍ时，基本上无尺寸效应．这一结论对大体积混凝土结构的非线性开裂计算有着重要的意义．Fracture energy of concrete is a frature parameter considering the softening property which is based on the fictitious crack model.The parameter is necessary for nonlinear cracking caculation of concrete.In this paper,the wedge splitting test method is used to study the influence of specimen height on fracture energy GF of concrete. Resuclts show that GF value is depentent on the specimen height witlhin definite ranges. But the phenomenon of size effect vanishes when the specimen height is larger than 50cm the result has an important signifigance for the cracking caculation of large concrete structures.

关 键 词：混凝土结构 断裂能 尺寸效应 

分 类 号：TU375.01[建筑科学—结构工程]