Seismic Resistance Evaluation of Precast Prestressed Concrete Simply Supported I-Girder Bridge by Adopting Non-Linear Static Analysis of Pushover Method

A bridge is a construction that enables traffic to cross a barrier while keeping in touch with roads or railroads.Throughout history, bridges have played a crucial role in human civilisation and remain an essential component of any transportation network.The main purpose of this study is to evaluate the seismic resistance of bridge structure under effect of earthquake action by adopting force-displacement yielding points and performance points methods.The results of force-displacement yielding point and performance points revealed that the transversal yielding points were greater than the longitudinal yielding points and performance points, this indicates that the seismic action on the transversal bents has little effect and that no damage will be done to the bents if they are subjected to this action alone but in longitudinal direction the force-displacement yielding point and performance points were lower, indicating that the seismic resistance performance of bridge bents is small with low elasticity and stiffness and high plasticity.Meaning that bridge bents capacity cannot resist the demand.Therefore, Therefore, this study suggested to improve the structural performance and seismic resistance of bridge bents by increasing the diameter of bridge piers by 1.6m, 1.8m, and 2m.After thickening the piers structure, the results of yielding points and performance points values were increased with increasing the piers diameter.And the seismic displacement decreased with increasing the piers diameter.Indicating that the elastic limit of bridge bents will increase and the bridge piers will resist the earthquake action according to increase in the stiffness and bearing capacity of bridge bents.