The Mechanical Behavior Of Steel-Concrete Composite Beam With Girder Splices

Initially due to the limited computing ability and level of research, in order to simplify the analysis and design process, steel connection is usually simplified into either ideal pin connection or fully rigid entirely.The ideal pin connection can not bear and transmit the moment, and the rigid connection can bear and transmit all the bending moment. There are no ideal pin connection or fully rigid joints in the practical engineering. The called semi-rigid connection, which is a kind of node model between the rigid connection and the ideal pin connection, considers the nonlinear relationship between the moment and rotation relationship.In this paper, the section types of the composite beam are T-shaped steel and concrete composite beam, with high-strength bolts and splice plates board of the steel girder. In the first of all, the research object is the splice joint of composite beam steel girder, the elastic and plastic limit bearing capacity and the deformation characteristics of the joint are analyzed. Secondly, through the finite element analysis software ANSYS, the solid model of the joint is established, and the moment rotation curve of the joint is obtained. Finally according to the splice joints constitutive relation, using ANSYS software, two-span continuous combination of high-strength bolted-splicing and two-span continuous composite beams of the girder rigid connection. Analysis and comparison of two different splice joints continuous composite beam deformation and carrying capacity.When the load is small, the continuous composite beams with two different splicing modes have similar structural stiffness. With the load further increasing,after overcoming the friction provided by the high-strength bolts, joint semi-rigid characteristics began to play a role, results show that with the composite beams under the premise of structural strength and stiffness, reasonable steel girder semi-rigid connectiondesign can be used to enhance the capacity of deformation of composite beam structure.In this paper, the research results can be used for the design and calculation ofsteel and concrete composite beams which it’s steel girder spliced with high-strength boltes, and provides reference for further research on the calculation theory of steel and concrete composite beams.