DYNAMIC ANALYSIS OF CONCRETE GIRDER BRIDGES UNDER STRONG EARTHQUAKES: THE EFFECT OF COLLISION, BASE-ISOLATED PIER AND WING WALL

This paper presents the dynamic analysis of concrete girder bridges taking into account the effect of collision on parapet wall. In addition, a dopting of seismic isolation rubber on pier structure and wing wall on parapet were analyzed. Two spans concrete girder bridgeswith variation of gap were examined in theoretically by 3D FEM model of A BAQUS. The abutment was simplified by parapet wall which was modeled by 3D reinforced concrete structure. In order to examine the seismic behavior of bridge, six different inputs of seismic ground accelerations were applied at footing of pier structure.It has been suggested that allowing the collisionon abutment by restricting the girder bridges displacement, the size of expansion joints can be reduced in order to reduce the cost of construction and seismic reinforcement