Design And Analysis Research Of Large-span Continuous Rigid-framed Railway Bridge

The developments of continuous rigid-framed bridges,structural characteristics and performance are reviewed in the thesis.The Nanchong Jialing river double line main bridge is as the engineering background in the thesis,and the bridge is located on Lanzhou-Chongqing Railway Line.First,bridge structure design,including beam section,prestress,piers with foundation.Second,a beam element model of the whole bridge is established based on finite element analysis software MIDAS/CIVIL 2013.Third,in accordance with the cantilever construction technology,consider concrete filled with suspended concrete,tensioned prestressed steel beam,grouting,mobile hanging basket etc in detail,the structural effect of beam and main pier for every construction step is calculated,and check the stress and stiffness according to the relevant railway specifications;the operation stage of the completed bridge is analyzed,and the structural effect of the bridge under the action of each load is calculated.According to the railway code,the calculation and checking of the main load,the main force and the additional force are carried out.With the combined element model ANSYS 15.0 finite element software to establish the bridge No.0 block,the calculation and analysis of the main and the additional longitudinal force and the main force and the additional longitudinal force and the main force and additional lateral force,the 7 section is the maximum principal stress,stress,minimum principal stress distribution.Therefore,it is reasonable to know the key indexes rationality of the whole bridge design of Nanchong Jialing river double line bridge.