混凝土中心裂缝单轴拉伸损伤断裂数值模拟研究

基于对混凝土细观力学的认识,假定混凝土是由砂浆基质,骨料及它们之间的界面组成的三相复合材料,各组分的材料性质按照某个给定的Weibull分布来赋值,细观单元满足弹性损伤的本构关系,应用细观力学损伤模型研究了混凝土的宏观力学性质,并且通过有限元程序对中心裂缝混凝土试件在单向拉伸情况下的破坏过程进行了数值模拟.模拟结果表明,该模型可以用来研究单向载荷作用下混凝土结构的破坏机理.

Numerical Simulation of Tension Fracture in Concrete with Central Crack

It was supposed that concrete was a three phase composite,which was composed of mortar,aggregate and their interface.The meso-structure of concrete followed Weibull distribution.A two-dimensional random distribution structural model of concrete was developed for numerical simulation of central cracks in concrete specimens with tensile stresses exerted in one direction.With the model,the routes of crack extension in mortar,aggregate,and their interface,as well as the macro stress-strain curve of concrete specimens,were derived.The results show that the method can be used to study the cracking process of concrete under single direction loads.