STEEL TRUSS RAILWAY BRIDGE INTERACTION EFFECT WITH LWR TRACK

Abstract

In the present scenario most of railway lines go for long welded rail or continuous welded rail for higher level of comfort riding, safety and reduced track maintenances and also reduced total life cycle cost. LWRICWR is more attractive for high speed railway lines, metro rail networks. Due to interaction between long welded rail track and bridge, there is a chance of variation in forces due to implementation of welded rail compare to conventional rail on railway bridges. Problem in continuing LWR over Railway Bridge has been long debated topic. Through analysis of the bridges should be made after the conversion to LWR is made regarding the seismic safety. The analysis has been made with replacement of LWR track on the bridges. The type of analysis used, in this report confines to response spectrum with the type of soil condition as soft. However, time history analysis for a given earthquake (chi chi) has also been done for one of the bridge of 76.2 in span for 32.5 T route. The analysis results have been presented in the report and it is found that all the bridges are safe even after the replacement of LWR is done