Finite Element Analysis Of Steel Concrete Joint In Large Span Continuous Rigid Frame Bridge

In recent years, with the rapid development of large-span bridges,It has becomethe trend of the bridge design that to give full play to all kinds of the materials’advantage, to improve the structure’s comprehensive ability to resist loads and to ensureachieving the effect of safe and economic. Steel-concrete composite structure is aconcrete manifestation of the material optimization.In large-span bridge engineering, the steel-concrete joints have been widely usedin the steel box girder and concrete box binding sites in the past engineering practice,especially in the cable-stayed bridge and arch bridge. The double-track bridge ofchongqing changjiang River is a continuous rigid frame bridge which is the first to usesteel-concrete joints in the world, it has been breaking new ground that Use steel-concrete joints in Large-span rigid frame bridge. With a main span330m, thedouble-track bridge of Chongqing Changjiang River set a new record that It’s the largestspan continuous rigid frame bridge in the world. The form of the Steel-concrete jointsis that the bearing plate is behind the filled concrete. On the functional requirements, thejoint mainly bears bending and shear，Axial compressive stress is mainly borne by thebearing plate and PBL shear key commitments, shear stress is mainly borne by the PBLshear key. In this paper, we use the finite element software ANSYS to establishthree-dimensional finite element model of the local steel-concrete joint, thecomponents of the model are simulated by solid elements which can coupling concrete,steel box, PBL shear key, prestressed steel bar better. We can get the force transmissionmechanism by calculating and analyzing the stress distribution of the variouscomponents on the joint. The analysis showed that: steel-concrete joint could transmitforce clearly and the force it has is uniform; PBL shear key bear most of the shear, roofand floor of the shear key should be distributed in the outer; it need to have sufficientpre-stress to offset the large stress which is caused by the moment on the structure. Withthe background of the double-track bridge of Chongqing Changjiang River, the mainwork of this paper is as follows.1. Give a systematic summary of the past steel-concrete joint design type, analyzeand evaluate its mechanical properties.2. Create a simple component model of PBL shear key with ANSYS and combinedwith previous experimental data, analyze the failure mechanism and sum up the main factors that affect its ultimate shear strength.3. By using ANSYS software to establish the bridge steel-concrete joint of thelocal three-dimensional finite element model, analyze its main stress components andforce transmission mechanism.4. Investigate the size and distribution of stress on materials of the joint, evaluateits safety reserves.5. Study the mechanism and stress performance of PBL shear key, analyze itsability to resist shear and moment by analyzing the size and the distribution of the stress,optimize their distribution location...