基于扩展有限单元法和弥散裂缝法的玄武岩纤维混凝土构件裂缝扩展研究

Research on Crack Propagation of Basalt Fiber Reinforced Concrete Members Based on Extended Finite Element Method and Dispersion Method

混凝土水工结构具有易裂性和水敏感性,在季节性冻土地区容易因裂缝扩展而形成裂-渗-冻的互馈破坏机制,这对混凝土水工结构的耐久性影响很大.掺有玄武岩纤维的混凝土结构的抗裂性能优越.为准确刻画混凝土构件裂缝的扩展情况,在力学性能实验基础上,通过扩展有限单元法及弥散法对玄武岩纤维混凝土结构进行开裂分析,探索裂缝分析的相关参数设定,研究不同方法下裂缝扩展的特点及规律.结果表明,弥散裂缝法可确定模型开裂的基本位置,再结合扩展有限单元法进行更准确的预测,可达到较好的模拟结果.可为玄武岩纤维混凝土结构在抗裂方面的应用研究提供参考.

Due to the crack susceptibility and water sensitivity of concrete hydraulic structure,it is easy to form a destructive interaction mechanism of crack-percolation-freezing in seasonal frozen ground because of the crack propagation,which has a great impact on the durability of the concrete hydraulic structure.The basalt fiber reinforced concrete structure has superior crack resistance.In order to accurately characterize the crack propagation of concrete members,cracking analysis of basalt fiber concrete structures was carried out with mechanical property experimentsby extended finite element method(XFEM)and dispersion method,to explore the relevant parameters and the characteristics and laws of crack propagation under different methods.The results show that the overall crack location of the model can be determined by the dispersive cracking method,and better simulation results can be provided by more accurate prediction with the XFE method.The research provides reference for the application study of basalt fiber concrete in crack resistance.