Simulation Analysis of Bridge’s Deck Dynamic Response subjected to Vehicular Load considering Road Roughness

Abstract

Bridge deck is the most significant part of the superstructure of bridge as it is used
by the vehicles to cross over the bridge. The bride deck experiences loads which include the
mass of the vehicles and the dynamic loads that are introduced from movement of the
vehicles. The dynamic forces might occur from “Bouncing” or from striking a joint or
potholes on bridge deck. Because of this every day dynamic loads the deck may experience
some cracking because of excessive stress accumulation. As the surface of span degrades
over a time, the lane surface irregularity profile also very accordingly. The differing in
surface irregularity will give rise to increased dynamic loads on the bridge deck through
dynamic interaction between surface irregularity and vehicles. The situation may further
worsen when overweight trucks are running on the rough bridge surface. The increase in
dynamic force leads to increased stress on bridge deck. It is also noticed that on many of the
bridges in Goa there are speed restriction imposed without considering the bridge deck
dynamics which get modified according to road roughness condition. The road roughness is
another factor which affects the dynamic actions of the span. So, in order to predict the bridge
deck performance to roughness modified dynamic loads, i.e. displacement and stress, detailed
dynamic analysis has to be worked out. In my study an analytical approach will be carried out
considering dynamic effects due to road roughness. A detailed FEM –analysis of typical
girder of bridge will be carried out considering road roughness. The results will help in
decision making on speed limits on bridges and health monitoring of the bridges and deck
surfaces.