摘要
为了研究混凝土的断裂性能,本文采用临界距离理论(TCD)线法,推导得到了广义临界距离、名义断裂韧度及混凝土抗拉强度之间的函数关系,并在此基础上分析混凝土的断裂问题。结果表明:TCD线法能够获得比双K断裂准则略微保守的断裂韧度,同时可以得到相应断裂过程区长度的估算值。将线法应用于几何相似的混凝土梁的断裂韧性和断裂过程区分析,并与由双K断裂准则得到的失稳断裂韧度进行比较,计算结果验证了线法的可行性。
To study the performance of concrete fractures,using the line method of the theory of critical distance(TCD),this paper derives functional relationships between generalized critical distance,nominal fracture toughness,and tensile strength of concrete.The results show that the TCD line method can obtain fracture toughness slightly more conservative than that of the double K fracture criterion and it gives an estimated value of the corresponding fracture process zone(FPZ)length.It is applied to an analysis of the fracture toughness and FPZ of geometrically similar concrete beams,and comparison with the unstable fracture toughness obtained using the double K fracture criterion shows the feasibility of the line method.
作者
童谷生
陈树松
张天柱
TONG Gusheng;CHEN Shusong;ZHANG Tianzhu(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013)
出处
《水力发电学报》
EI
CSCD
北大核心
2020年第7期41-51,共11页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(11462005)
关键词
混凝土
临界距离
断裂韧度
抗拉强度
双K断裂准则
断裂过程区
concrete
critical distance
fracture toughness
tensile strength
double K fracture criterion
fracture process zone
