摘要
在细观层次上 ,应用蒙特卡洛法 ,在二维平面上建立了混凝土多边形骨料随机分布结构模型。对该模型采用有限元方法 ,根据最大周向正应力准则 ,以混凝土三点弯曲梁试件为例 ,进行了开裂过程的模拟 ,得出了裂纹在基质、骨料及界面中的扩展路径。仿真分析表明 ,混凝土试件的承载能力随着组成骨料粒径的不同而变化 ,文中对此进行了讨论。
Advances in numerical simulation have provided an economical and fast way for predicting fracture strength of concrete, bringing obvious advantages to engineering applications. Section 1 discusses in some detail the mathematical model we propose for simulating the fracture process of concrete. Subsection 1.2 is particularly important; on the meso level of concrete, subsection 1.2 develops with Monte Carlo method a polygon aggregate structure model, which is randomly generated in two dimensional plane. Sections 2 and 3 analyze the growth process of a crack of concrete 3 point bending beam with FEM (Finite Element Method). Using the well known assumption that crack starts when the maximum circumferential tensile stress reaches the critical value, section 3 simulates the path of crack propagation through mortar, aggregate and interfaces as shown in Figs. 4 and 5. Section 4 gives numerical simulation results and their discussion. Table 2 and Figs.6 and 7 show how the fracture strength and carrying capacity vary as average size of stones in concrete varies. The simulation results show that the carrying capacity of concrete increases with decreasing average size of stones in concrete.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2003年第5期556-559,共4页
Journal of Northwestern Polytechnical University
关键词
混凝土
界面
断裂
有限元方法
数值模拟
concrete, interface, fracture, FEM (Finite Element Method), numerical simulation
