Simuliation Analysis Of Joint On High-Speed Railway Beam-truss Composite Bridge

When LanXin high-speed railway cross the XiLan highway, in order to assure the clearance of highway, reduce the depth of beam, inprove the dynamic performance, beam-truss composite railway bridge is employed. The research on steel-concrete composite joint is critical in designing the bridge.Finite Element Method software ABAQUS is applyed in this thesis. Considering the nonlinear behavior of the material, solid model of steel-concrete composite segment is established to simulate the force condition of the structure. Two kinds of joint model are compared, type one is nomal diaphragm, type two is reinforced in the lateral of gusset plate, force transmission of structure and stress conditions of components are analyzed. The contents in this thesis mainly discussed about are:1) There is no difference about the structure stiffiness between two models. The distribution of shear force during the tansmission differs from each other. The forces of both models are mainly transmited on the diaphragms. In model two, the diaphragm accounts more and the PBL accounts little.2) Under the design load, in the front of the loading direction, both of the concrete chords are cracking on the top, and the concrete is working in plastic stage on the bottom. In the longituginal direction the stress of the chord is decreasing grandually.3) Under the design load, the diaphragm is working in plastic stage where it is connecting with the gusset plate. Both of the web members are working in plastic stage. In other area, the material of the steel structure is working in elastic stage.In general, both of the structures are good at transmitting force; two models are reasonable and reliable. Because of the differences on configuration the transmission of the force are different from each other in local.