基于内聚力模型的含畸形骨料混凝土单轴受拉细观模拟研究  

Meso Simulation of Uniaxial Tension of Concrete with Deformed Aggregate Based on Cohesive Zone Model

作　　者：张小飞[1] 田羽 覃培 肖天培 吴健 ZHANG Xiaofei;TIAN Yu;QIN Pei;XIAO Tianpei;WU Jian(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,Guangxi,China;PowerChina Beijing Engineering Corporation Limited,Beijing 100024,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]中国电建集团北京勘测设计研究院有限公司,北京100024

出　　处：《水力发电》2022年第5期73-77,共5页Water Power

基　　金：国家自然科学基金资助项目(51809051)。

摘　　要：基于内聚力模型的研究方法,以畸形骨料(针状)的长宽比C k、畸形骨料在混凝土中的占比Z b和畸形骨料在混凝土中所处的级配J p 3个参数为变量,在细观层次上对二级配含畸形骨料混凝土的损伤和开裂过程开展单轴拉伸模拟研究,对含畸形骨料混凝土在单轴拉伸下的受力全过程进行了分析。结果表明,C k越大、Z b越高、J p越大时,混凝土抗拉强度越低;含畸形骨料混凝土单轴受拉时,破碎骨料主要是畸形骨料,且畸形骨料占比越高,畸形骨料发生破碎的可能性就越大;C k、Z b、J p对混凝土抗拉强度的影响权重表现为C k>J p>Z b。Based on the cohesive zone model,the length-width ratio C k of acicular deformed aggregate,the proportion of acicular deformed aggregate in concrete Z b and the gradation J p of acicular deformed aggregate are taken as variables to carry out uniaxial tensile simulation research on the damage and cracking process of two-graded concrete with deformed aggregate at meso level,and analyze the whole mechanical process of concrete with deformed aggregate under uniaxial tension.The results show that:(a)the larger the C k,Z b and J p,the lower the tensile strength of concrete;(b)when the concrete with deformed aggregate is under uniaxial tension,the broken aggregate is mainly deformed aggregate,and the higher the proportion of deformed aggregate,the greater the possibility of deformed aggregate breaking;and(c)the influence weight of C k,Z b and J p on the tensile strength of concrete are C k>J p>Z b.

关 键 词：混凝土 内聚力模型 畸形骨科 抗拉强度 细观模拟 

分 类 号：TV431[水利工程—水工结构工程]