Research On Characteristics Of Force Transmission Of Combination Part Of Steel And Concrete Of Steel-prestressed Concrete Composite Continuous Beam Bridge

As a new type of structure, steel-prestressed concrete composite continuous beam brigde has the advantage of reasonable mechanical behavior, superior performance, convenient construction and economy.With its design tures of cross-border with continuous concrete box girder, the cross with steel box girder, steel-prestressed concrete mixture box beam bridge had a wide range of applications at home and abroad, and its junction of Steel box and Concrete box Beam as its most critical structure, which maked steel beams and concrete beams into continuous structural system in order to transfer the various loads smoothly. Right now, domesic and international theoretical researchers are not enough on aspect of steel-prestressed concrete composite structure, these aspects have a great influence on the application of this reasonable structure system.Based on the research of scholars in the domestic and foreign, and used for reference to scholars'experiments in the domestic and foreign, this essay mainly based on the background of the G318 in Changing County, State Road Long bridge Bridge,studied about the characteristics of force transmission of combination part of steel and concrete of steel-prestressed concrete composite continuous beam bridge, the specific research is as follows:Firstly, this paper summarizes the relevant theory of the structure finite element modeling.Then, the current situation of the relevant of the connection of steel and concrete was studied. The two most commonly used shear connectors including studs and PDL plates with holes were researched. Afterwards, the mechanical properties and the formula bearing capacity at home and abroad of studs and the PDL plates with holes were introduced, and its respective failure modes analyzed briefly.Secondly, as the background of the G318 in Changing County, State Road Long bridge Bridge, analyzing the case of the structure of steel concrete composite, then, using the finite element method and its actual structure, the integration of its steel-concrete sections related transfer mechanism conditions including the bending moment, axial force and shear force were studied, the results showed that the ministry of steel and concrete with good performance, able to transfer load smoothly.Finally,based on the complex characteristics force of mixing Department of Long Bridge, using the finite element analysis method, established the finite element model of combination of the bridge's steel-concrete, and its under the condition of the relevant load cases were analyzed. And analyzing the stress distribution, the results show that there is a small number of steel concrete composite section stress exceeds the allowable value, and high stress concentration in the tiny area and the whole structure is in a smaller state of stress, the entire section of the bridge and steel concrete composite performance were safety of overall.