The Computation Analysis And Research Of Shrinkage And Creep For Long-span Continuous Rigid Frame Railway Bridge

The continuous rigid frame bridge has advantages of continuous beam and T-rigid Frame. Piers, beams and foundation are combined together to bear a several of loads. It has small size on dimensions, large clearance under the bridge, wide vision and with more good technical and economic nature. It is one of the most competitive bridges at present. Continuous rigid-frame bridge construction technology has increasingly matured, but in actual conditions, to make the bridge meet the practical function, facilitate construction and be more technical and economic always been an examining issue.The Thesis takes a high-pier large-span continuous rigid frame railway bridge which named Xun Jang Bridge., Many mechanical Properties are studied.(1) With the principle of finite element method in the bridge, the space finite element model of the whole bridge is established through the Software of MIDAS-CIVIL, the computation analysis, the analysis of concrete shrinkage and creep is given to the whole bridge.(2) Based on the computation analysis of the whole bridge, calculated the internal force of the key parts in the main construction stages, then, the results were analyzed and summarized.(3) On the basis of the shrinkage and creep secondary internal force analysis of long-span continuous rigid frame railway bridges. And it contains:mechanism of shrinkage and creep, factors affecting the shrinkage and creep, influence of shrinkage and creep on structure appearance, calculating theory of shrinkage and creep. After the explanation of the theory of shrinkage and creep, a further analysis on an example is followed.Through the study of structure feature, internal force analysis, deformation, bending moment, shrinkage and creep secondary internal force analysis of continuous rigid frame bridge, we can conclude the major transformation or internal force of the pivotal section of the bridge in working and finished period recognize main parameters of construction control, and summarizes the law, make sure the result can be used for designing and construction of the same project.