基于能量法的混凝土损伤断裂耦合分析  

Coupling Analysis of Concrete Damage and Fracture Based on Energy Method

作　　者：何晓壮 邓爱民[2] 杨建凤 HE Xiao-zhuang1, DENG Ai-min 2 , YANG Jian-feng3(1. Shanghai Qiannian Urban Planning and Design CO. , LTD. , Shanghai 201108, China; 2. Department of Engineering Mechanics, Hohai University, Nanjing 210098, China; 3. Jiaxing Finance Bureau, Jiaxing 314000, Chin)

机构地区：[1]上海千年城市规划工程设计股份有限公司,上海201108 [2]河海大学工程力学系,江苏南京210098 [3]嘉兴市财政局,浙江嘉兴314000

出　　处：《浙江水利水电学院学报》2018年第4期46-50,共5页Journal of Zhejiang University of Water Resources and Electric Power

摘　　要：混凝土结构的破坏过程,实际上是损伤和断裂交织发展的耦合过程,其实质是材料的逐渐弱化,并伴随着能量的耗散,从能量平衡的角度判定混凝土裂缝的稳定性是一个常用的方法.结合断裂力学和损伤力学,针对I型张开型裂缝,推导了裂缝尖端附近损伤断裂耦合参数——损伤型能量释放率计算公式.基于线性渐进叠加假定,采用数值计算的方法模拟了4种不同尺寸三点弯曲梁试件的断裂破坏过程,并通过计算得到了断裂能量释放率、损伤能量释放率和损伤断裂能量释放率.通过对断裂能量释放率、损伤能量释放率和损伤断裂能量释放率随裂缝扩展变化规律的对比分析,给出了裂缝失稳扩展时对应的损伤断裂能量释放率.The failure process of concrete structures in fact is a coupling process of interweave development of damage and fracture,and its essence is the gradual weakening of the material equally accompanied by energy dissipation,and the stability of cracks in concrete is commonly determined by the analysis of energy balance. Combining fracture mechanics with damage mechanics,a concept of coupling parameter considering the composite influence of damage and fracture in the region near the tip of crack,the energy release rate of damage and fracture,has been proposed,and the formula of the energy release rate of damage and fracture has been derived for Mode I crack. Based on the linear asymptotic superposition assumption,the fracture failure process of four groups three-point bending notched beam specimens with different sizes have been numerically simulated,and the fracture energy release rate,the damage energy release rate and the energy release rate of damage and fracture have been calculated. In the end,the vary discipline of the fracture energy release rate,the damage energy release rate and the energy release rate of damage and fracture with the crack propagation have been comparatively analyzed,and the energy release rate of damage and fracture at the critical situation of unstable crack propagation has been given.

关 键 词：能量法 损伤 断裂 耦合 损伤断裂能量释放率 

分 类 号：TU37-02[建筑科学—结构工程]