IMPROVEMENT OF SEISMIC PERFORMANCE OF BRIDGES USING THE CIRCULAR STEEL MEMBERS, AND A SEISMIC RETROFIT METHOD OF BRIDGES

摘要

The present invention effectively reduces the seismic energy by the plastic hysteresis behavior of the round bar having a reduced section at a specific location, and seismic reinforcement device for bridges and bridge structures lacking seismic performance before the introduction of seismic design and reinforcement method using the same. The purpose is to provide.;The seismic reinforcing device for bridges according to the present invention for achieving the above object is inserted into the upper bracket and the upper bracket is fixed to the side of the girder via the anchor bolt and the round bar is fixed and fastened with a nut and ; A pad for securing hysteresis behavior due to displacement occurring above the stretch behavior of the upper structure of the bridge; The other side of the round bar is inserted through, characterized in that consisting of a lower bracket which is fixed with a nut and fixed to the side of the pier via an anchor bolt.;In addition, the reinforcement method using the seismic reinforcement device for bridges according to the present invention for achieving the above object comprises the steps of: chipping the girder and the pier surface of the target bridge to be installed; Assembling a seismic device for a bridge comprising an upper bracket, a round bar, and a lower bracket; Attaching an upper bracket of the seismic reinforcement device for the bridge via an anchor bolt to a side of a girder, and attaching and installing a lower bracket through an anchor bolt to a side of a pier; The side of the upper bracket is characterized in that it consists of a step of finishing by welding through the finish bracket.;Seismic retrofit device for bridges, reinforcement method, upper bracket, lower bracket, round bar