Effection On Form Of Bearing For Prestressed Concrete Curved Box Girders Bridge

With the development of highway and urban overpass construction, curved girder bridge is widely utilized and developed with its economic, aesthetic and practical, but many problems occurs during the service stage of curved girder bridge. This paper reviewed the current development and research condition on the curved prestressed concrete beams, aimed at the problem, such as bearing off air, beams flip, body sway, pier beam cracks, which severely affected the safety of bridge , analyzed the the mechanical characteristics of curved beam, and illustrated the reasons and influencing factors for these diseases and. Combined with the construction and design experience of a large number of curved girder bridge, the research directions in this article is determined to be the effect of the support layout to the curved beam. The emphasis is focused on analysis of effect of arrangement of eccentric center bearing of curved girder bridge to the reaction and the internal force of curved beam.This paper is based on the deficiency of current study on the indoor model test of curved girder, relied on the project funded by science and technology of communication in Shaanxi Province - "research on design methods and ultimate bearing capacity of curved prestressed concrete box girder bridge (03-01K)" indoor model test is carried out. Through this test, effect of reactions, internal force of cured girder, which changed with the change of distance from eccentric center of mid support and distance between the side supports, is realized. In addition, finite element model is analyzed to test the correctness of the result of the model test. the conclusions of the model test is well demonstrated by finite element model, which is the established by beam elements. based on this result, the effect of reaction and internal force of curved girder is studied through changing the span of the finite model. Because the radius of curvature of the curved girder is another factor of the curved girder, this paper also simulated the change of curvature of curved girder bridge through the finite element model, studied the effect of reactions, moments and torque to the radius of curvature of the curved beamThrough the indoor model tests and finite element analysis, the general regulation of the reaction and internal force, which on the condition of different layout of supports is summarized. The effect of radius of curvature to the curved girder is also summarized, It is provided a good test and theoretical reference for the design and rational arrangement of support during the construction stage.