中文摘要：

提出一种利用扩展有限元法（e Xtended Finite Element Method,XFEM）和虚拟裂缝模型对混凝土断裂过程区（Fracture Process Zone,FPZ）进行研究的方法.利用该方法可以求出裂缝扩展过程中混凝土FPZ的长度及位移和应力分布.利用该方法对一个三点弯曲混凝土梁进行研究,考察骨料粒径、不同软化律和不同初始裂缝长度对FPZ的影响.

英文摘要：

A method is proposed to study the Fracture Process Zone （FPZ） of concrete based on eXtended Finite Element Method （XFEM） and a fictitious crack model. The length, displacement and stress distribution of FPZ during the crack growth process can be obtained by the method. A three-points bending concrete beam is studied and the effect of the aggregate size, different softening laws and different initial crack length on FPZ is studied.