Static And Fatigue Testing Research On Orthotropic Steel Decks Of Railway Bridge

The orthotropic steel bridge decks have many advantages, such as light weight,low building height, higher bearing capacity, strong ability of spanning, widely sphereof application. With the development of Chinese high speed railway construction, thisbridge deck structure has been widely used. However, fatigue problems are inevitablebecause it is a whole welding structure. At present, there is no fatigue standard aboutthe construction details related to the orthotropic steel bridge decks in Chnia’s bridgedesign specification.The thesis based on the key subject of MOR “research of fatigue behavior andstructural details optimization for orthotropic steel decks of high speed railway”.Firstly, making a deck plate system stress analysis of orthotropic steel bridge decksfor railway bridge, and then, doing a static test and fatigue test to structure details ofU rib to deck plate and crossbeam joint. Pay close attention to the stress distributionof deck plate, U rib, crossbeam and other construction details that with differentshape of cope holes in the crossbeam. Meanwhile, drawing a comparison between thetest results and the finite element model. The main work done and achievements arementioned as follows:(1)By deck plate system of orthotropic steel bridge decks is built. Making clearof the stress distribution about major component parts of orthotropic steel decks,stress on deck plate is mainly concentrated in the location where is supported bycrossbeam, circular of cope hole in crossbeam and U rib to crossbeam joint are easilyhappened stress concentration; as the train live load distribution width and length arelarger，the orthotropic steel bridge decks should consider the effect of double-line andmulti-axis load;(2)Doing a static and fatigue test and finite element analysis to the single U rib’sfull-scale specimen at U rib to deck plate and crossbeam joint, result shows inorthotropic steel bridge decks system, the location of maximum stress often happensat U rib to deck plate and crossbeam joint; simultaneously, set up a cut-out at U rib to deck plate and crossbeam joint can effectively reduce the stress concentrationphenomenon, thereby reducing the stress of whole orthotropic steel bridge decks;(3)Doing a static and fatigue test and finite element analysis to the multi-U rib’sfull-scale specimen at U rib to deck plate and crossbeam joint, stress at the weld toeof U rib to crossbeam joint is farther away from the weld toe, smaller the stress is,and it presents linear variation; for the stress along the U rib, farther away fromcrossbeam, smaller the stress is; loading in the top of U rib has more disadvantagethan loading in the rib teeth;(4)By the static test results and finite element model of different shape of copeholes in the crossbeam, apple-shaped cope hole can be judged better than arc-shapedcope hole in the crossbeam.