A Finite Element Analysis Method for the Precast Slabs’ Assemblage in a Prefabricated Steel- Concrete Composite Continuous Rigid Frame Bridge Yanmei Gao 1 ,2 Dong Liu2 Zhixiang Zhou,2 （1. Engineering Research Center of Bridge Structure and Material in Mountainous Area, Ministry Education, Chongqing Jiaotong University, 400074; 2. College of Civil Engineering, Chongqing Jiaotong University, 400074. ) Abstract: To study the mechanical performance for a new type of prefabricated steel truss-concrete composite continuous rigid frame bridge which is proposed by our team, a finite element analysis method is conducted considering the installation process of prefabricated slab. Two accurate finite element models are proposed: a) the elastic connectors are activated between steel truss and prefabricated slabs when the steel truss elements are activated, which can realize the pairs an pairs prefabricated slabs assembled on the deformed steel truss. Only the stiffness value of SDx direction is set for the elastic connectors, which can simulate the slabs obtained the compressive pre stress by itself. After the whole prefabricated slabs are assembled on the steel truss and the longitudinal prestressed tendons are tensioned, the elastic connectors are change for rigid connectors. The slabs and the steel truss combined a composite beam to bear the late load. b) the large stiffness elements are activated between steel truss and prefabricated slabs when the steel truss elements are activated, which can realize the pairs an pairs prefabricated slabs assembled on the deformed steel truss. The rotation and horizontal constraint is released at the top of large stiffness elements, which can simulate the slabs obtained the compressive pre stress by itself. After the whole prefabricated slabs are assembled on the steel truss and the longitudinal prestressed tendons are tensioned, the rotation and horizontal constraint is reworked. The slabs and the steel truss combined a composite beam to bear the late load. Two finite element models are established by using the above two methods respectively which main span is 70 m. The key construction stages are analyzed in simulation. The results show that the two methods are accurately simulated the installation process for the prefabricated slabs. The data are in good agreements, the results of this paper can provide a reference for the similar structures.