The Analysis And Experimental Study Of Orthotropic Steel Bridge Deck Structure’s Mechanical Performance For Rongjiang Bridge

Abstract:Xiamen-Shenzhen Passenger Railway——Rongjiang Bridge is main span for (110+220+220+220) m steel truss girder with flexible arch combination system. Its span is the longest in the same bridge type around the world. The bridge deck is a new-type orthotropic steel bridge deck structure. The traditional concrete cushion with shear studs was replaced by the lightweight cushion system between railway ballast and steel bridge deck. The class of lightweight cushion was applied into domestic railway bridge for the first time. At the same time, the U rib was densely covered within the scope of railway ballast groove by means of weakening the effect of longitudinal beam in traditional orthotropic steel bridge deck. This article combined the needs of engineering construction and the plan of the scientific and technological development of CARS-The in-depth study of high-speed railway bridge technology----the crucial technology study of long-span continuous steel truss girder flexible arch bridge (contract number:2010g004-A) to study the new type of orthotropic steel bridge deck structure through structural theory and experimental research on the scene, the content of work and the innovation points are as follow:1. The whole truss bridge model was established, and analyzed the stiffness and stress effects of the bridge system which composed by bridge deck plate and longitudinal rib to stiffness of main girder, and further discussed the effects relative to change the position of main girder.2. In response to explore the issues which are difficult to be simulated accurately in the traditional segmental model method of the traditional study of orthotropic steel bridge deck structure as a whole. Space member system (SF method) was combined with plate and shell element method to establish multi-scale model by finite element software, which avoided the problem of selecting boundary conditions in traditional method. The stress state of each component in the orthotropic steel bridge deck structure and the boundary conditions of displacement were analyzed, and then the segmental model was established and calculated. The result was compared with multi-scale model.3. The stress effects of different parameters of the steel bridge panel (U rib wing) and U rib thickness on the orthotropic steel bridge deck structure was studied exactly, and the value range of bridge panel thickness and U-rib thickness was illustrated reasonably.4. The program design, experimental test and data analysis work of Rongjiang Bridge panel’s static test on site were completed in the study, which was compared with theoretical calculation results of multi-scale model and the structural safety was evaluated in the period.5. The safety of the bridge structure was verified by the experiments and the results of theoretical analysis.