Correlation between tension softening relation and crack extension resistance in concrete

作     者：Xiufang ZHANG Shilang XU 

作者机构：Department of Civil and Hydraulic EngineeringDalian University of TechnologyDalian 116024China 

出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)

年 卷 期：2009年第3卷第3期

页      面：323-329页

学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 08[工学] 0813[工学-建筑学] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 080102[工学-固体力学] 

基　　金：This paper was financially supported by the National Natural Science Foundation of China(Grant No.50438010). 

主　　题：concrete fracture process zone crack exten-sion GR resistance tension softening curve 

摘      要：Changes of the material fracture toughness with crack propagation can be described by a crack extension resistance curve,one of the fundamental fracture criteria in crack mechanics.Recently,experimental observation of the fracture behavior in concrete was used to develop a new fracture criterion,the crack extension GR resistance curve,to analyze crack propagation during the entire concrete fracture process.The variation of the crack extension resistance is mainly associated with the energy consumption in the fracture process zone ahead of the stress-free crack tip.The crack extension resistance is then a function of the softening curve,which is a basic mechanical property in the fracture process zone.The relationship between the softening curve and the crack extension GR resistance curve is then analyzed based on results of three-point bending beams tests.The results indicate that the characteristic points of the crack extension resistance GR curve is closely related to the characteristic point on used tension softening curve.