不同骨料体积率的轻混凝土损伤-断裂分析  

Fracture analysis of lightweight concrete with different aggregate volume fraction

作　　者：柯杨[1] 姜胜涛 李佳 项吴桐 KE Yang;JIANG Shengtao;LI Jia;XIANG Wutong(Wuhan University of Technology,Wuhan 430070,China;University of Paris 13,LSPM Laboratory,Paris France)

机构地区：[1]武汉理工大学,湖北武汉430070 [2]巴黎第十三大学LSPM实验室,法国巴黎

出　　处：《混凝土》2020年第7期15-19,24,共6页Concrete

基　　金：十二五国家科技支撑计划子课题(2014BAB15B01)。

摘　　要：利用三点弯曲梁试验,对不同骨料体积率的轻骨料混凝土进行了断裂试验研究;同时,将混凝土损伤模块和随机骨料投放模块植入基于耦合判据(Coupled Criterion)的有限断裂模型中,首次应用于轻骨料混凝土断裂的数值模拟中。结果表明:该模型能够有效的模拟荷载-位移曲线的全过程,并且同时描述材料的损伤和断裂,同时预测裂纹的萌生与传播;通过能量分析,得出损伤能与断裂能随轻骨料体积率变化的规律。Fracture tests of the lightweight aggregate concretes(LWAC)with different aggregate volume ratios were carried out by using three-point bending beam tests.The concrete damage module and random generation & distribution module are embedded in the coupled criterion-based finite fracture model,which is applied firstly in the numerical simulation of LWACs′ fracture.The final conclusions indicate that the model can effectively simulate the whole process of load-displacement curve,describe the damage and fracture of materials at the same time,and predict the initiation and propagation of cracks.Through energy analysis,the change rule of damage energy and fracture energy with volume fraction of lightweight aggregate is obtained.

关 键 词：三点弯曲试验 能量准则 最大应力准则 损伤模型 耦合准则 

分 类 号：TU528.01[建筑科学—建筑技术科学]