Study Of Longitudinal Force In Multi-span Simply Supported Girders Bridge With Continuously Welded Rails

ABSTRACT:Based on the analysis and study of relevant theories and computational model, as well as the current construction situation of high-speed railway bridge in China, two-line bridge and line-board-pier integrated roadbed spatial finite element model is adopted in this paper, which gives a deep research of the transfer mechanism and the relevant influence factors of borg slab ballastless track laying on long bridge, which has a structure of continuously welded rails. The structure of borg slab track is complex, so the actual forcing condition of the rail and the convenience and reliability of calculation must be considered during modeling process under the premise of meeting the requirement of engineering precision, as well as appropriate simplification of the mechanical model. Track structure, girders, bearings, piers and terminal spines are considered as a whole during modeling. This paper mainly studies the following aspects:1. Based on the principle of girder-rail interaction, take the two-line multi-span simply supported girder bridge of high-speed railway as instance, the spatial interaction model of borg ballastless track and bridge is established to give relevant calculation and analysis by finite element software ANSYS.2. Calculate and analyze the expansion force, the braking force, the broken force, etc, and then determine the variation of longitudinal force under different load.3. Calculate and analyze the variation of longitudinal force under invalid sliding layer and reduced stretching stiffness of the track bed slab.4. Calculate and analyze the variation of longitudinal force under different length of friction plates and different stiffness of piers.The results show that the longitudinal mechanical properties of borg ballastless track on bridge under temperature load and braking force of the train is very good, which creates favorable conditions for the full line of cross-CWR, as well as the high-speed railway construction in China. Because of the complex factors which influence the longitudinal force of the railway, relevant design must be taken after comprehensive consideration of various parameters. 60 diagrams,17 charts,40 references.