Accurate description of concrete crack propagation is of great significance to practical engineering.This paper adopts the cohesive zone model(CZM)to investigate both the macro-mechanical properties and the micro-cracking damage behavior of concrete beams in a three-point bending test.Throughout the study of damage under loading in the three-point bending test,parametric examinations are conducted on five key factors controlling the cracking of cohesive elements regarding the case of circulate aggregate,namely type Ⅰ fracture energy,type Ⅱ fracture energy,shear strength,tensile strength and elastic modulus(stiffness).Through the test results of macro-mechanical properties and micro-cracking,the test results of a group of specimens and the results of parametric models are reversely analyzed,and the applicable parameter range of control factors in three-point bending simulation is obtained.Three computation models with different aggregate areas are established by taking account of the quantitative aggregate data from specimens with different mix proportions.The parameter range is then applied to derive quantitative results related to crack propagation.Eventually,the accuracy of the parameter range is validated against both the mechanical properties and quantitative crack data obtained from simulations and experiment.
关键词
内聚力模型/断裂参数/三点弯曲试验/裂缝扩展/细观尺度
Key words
cohesive zone model/fracture parameter/three-point bending test/crack expanding/meso-scale
维普
万方数据