Heterogeneous Fracture Simulation of Three-point Bending Plain-concrete Beam with Double Notches  

作　　者：Chuanchuan Zhang Xinhua Yang Hu Gao Hongping Zhu 

机构地区：[1]School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China [2]Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, 1037 Luoyu Road, Wuhan 430074, China

出　　处：《Acta Mechanica Solida Sinica》2016年第3期232-244,共13页固体力学学报（英文版）

基　　金：Project supported by the National Basic Research Program of China(973 Program:No.2011CB013800);Hubei Provincial Natural Science Foundation of China(No.2015CFB205)

摘　　要：Plain concrete is regarded as a two-phase material comprising randomly distributed aggregates and mortar matrix. A series of three-point bending concrete beams with symmetric or asymmetric double notches are modeled using the modified random aggregate generation and packing algorithm. The cohesive zone model is used as the fracture criterion and the cohesive el- ements are inserted into both the mortar matrix and the aggregate-mortar interfaces as potential micro-cracking zones. The dead and alive crack phenomena are studied experimentally and nu- merically; and the influences of notch location, aggregate distribution and gradation on fracture are numerically evaluated. Some important conclusions are given.Plain concrete is regarded as a two-phase material comprising randomly distributed aggregates and mortar matrix. A series of three-point bending concrete beams with symmetric or asymmetric double notches are modeled using the modified random aggregate generation and packing algorithm. The cohesive zone model is used as the fracture criterion and the cohesive el- ements are inserted into both the mortar matrix and the aggregate-mortar interfaces as potential micro-cracking zones. The dead and alive crack phenomena are studied experimentally and nu- merically; and the influences of notch location, aggregate distribution and gradation on fracture are numerically evaluated. Some important conclusions are given.

关 键 词：concrete beam double notches three-point bending fracture cohesive zone model 

分 类 号：TU755.7[建筑科学—建筑技术科学]