Research On Spatial Stress Of Long-span Railway Curved Continuous Girder Bridge

Along with construction of railway and further development of the high-speed railway, prestressed concrete curved girder bridge will increase day by day.In order to make the bridge obedience to the plane route arrangement and to enhance the function of the transportation, long-span railway curved continuous girder bridge arises at the historic moment. So it is more and more important to study the theory and analysize the mechanical characteristics in the process of designing on long span railway curved continuous girder bridge.Taking (70+125+70)m prestressed concrete railway curved continuous girder bridge of Zhengxu double-track railway as the background, the paper carried out a great of calculation and compassion to the main influence factors of the curved bridge by finite element program and changing parameter.In this paper, it was discussed principally, such as curvature factor, bearing plane layout. Furthermore the analysis and the conclusion were given about displacement and internal force for continuous curved box-girders in this paper.This dissertation has mainly dealt with the following respects:(1)With consultant of plenty of related literatures at home and abroad, this paper summarizes the designation method of curved girder bridge and expounds the current situation of curved girder bridge study and its development. What’s more, the properties of mechanics and its main influencing factors are analyzed in this paper, and a conclusion of analyzing theories is made as well.(2) By grillage model of whole birdge building, study the effect of curve radius on web plate shearing force, support reaction, vertical moment, torsional moment of curved continuous girder bridge by the different loads.(3) Combining with the common used layout of torsional bearing in railway bridge project, study inner force variation of curve continuous girder bridge under layout of torsional bearing and different curve radius. Discuss mechanical characteristics of curve continuous girder bridge affected by adjusting radial displacement of torsional bearing of intermediate piers and increasing bearing distance.(4)Combining with relevant codes, the paper discussed the influence of the curve radius on vertical deflection、rotation of beam、uneven rail surface of curved girder bridge under static live load and on bearing eccentricity, and the law of it is given.