Simplified FEM Thesis And Application Of PBL Shear Connectors

Since the perfobond-leiste strip (PBL shear connector) had been designed, because of the excellent mechanical properties in steel-concrete composite structure, it was widely used in bridge structure, especially in the long span bridges.Now, domestic and foreign scholars have researched the mechanical behaviors of PBL shear connector through test methods. The results were meaningful to practical application, and the finite element method based on3-D was widely promoted. However, existing calculation methods for PBL shear connector also had limitations in practical applications. It was important to propose a simplified finite element method for engineering calculation. According to the existing references, there was still little research in simplified finite element method.This thesis was based on the existing analysis theories of steel-concrete composite structure, in connection with the simplified calculation methods of PBL shear connector and its mechanical behaviors. In summary, the thesis studied following aspects:(1) Based on the load-slip curve equation of PBL shear connection, its nonlinear stiffness matrix was derived in unidirectional force case.(2) Based on the elastic-plastic theory, the thesis extended the1-D to2-D case, derived the nonlinear stiffness matrix of PBL shear connection under bi-directional force case and gained an explicit expression of the elastic-plastic stiffness matrix at last.(3) Taking the matrix displacement method and finite element method, the stiffness matrix calculation process which was suitable for finite element calculation was researched.(4) Taking Fourth Nanjing Yangtze River Bridge as an engineering example, the thesis researched the mechanical behavior of the anchoring system. The structure was simulated and the effectiveness of PBL shear connectors was analyzed by using Ansys software.(5) Taking Edong Yangtze River Highway Bridge as an engineering example, the thesis researched the mechanical behavior of the steel-concrete composite section. The structure was simulated and the effectiveness of PBL shear connectors was analyzed by using Ansys software.