基于数值模拟的混凝土系列有效断裂判据  

Research on series effective fracture criterions of concrete based on nmerical simulation

作　　者：邓爱民[1] 徐道远[1] 

机构地区：[1]河海大学力学与材料学院,南京210098

出　　处：《计算力学学报》2011年第B04期15-19,共5页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(50878077;10972072)资助项目

摘　　要：基于ANSYS平台,对某系列混凝土断裂破坏试验的加载过程进行有限元数值模拟,获得了荷载-加力点位移曲线。利用获得的曲线,在线性渐进叠加假定的基础上,确定了试件在失稳断裂时的临界有效裂缝长度。将模拟峰值荷载和临界有效裂缝长度代入由LEFM推导出的公式计算了考虑断裂过程区影响的有效断裂韧度。最后,通过对系列试验有效断裂韧度的分析,建立了基于数值模拟的混凝土系列有效断裂判据。The load versus loading point displacement curves of a series concrete fracture destructive tests are obtained by simulating the loading process of this series tests with finite element method based on the ANSYS software platform. Based on the linear asymptotic superposition assumption, the critical effective crack length of the gpecimen at the time of unstable fracture is calculated by analyzing these curves. The effective fracture toughness is calculated by inserting the maximum load of numerical simulation and the critical effective crack length into a formula developed from LEFM. In the end, the series effective fracture criterions of concrete based on numerical simulation are established by analyzing the results of effective fracture toughness of the series test.

关 键 词：数值模拟 混凝土断裂 有效断裂韧度 断裂判据 

分 类 号：TU528.042[建筑科学—建筑技术科学] O242.2[理学—计算数学]