Seismic Analysis and Fatigue Life Analysis of Slat-Leg Rigid-Frame Bridge

On the foundation of seismic researches and fatigue life prediction by scholars of home and abroad, a dynamic model of slant-leg rigid-frame bridge, which is across Tangkou to Tunxi highway, is built by ALGOR software based on the principle of element in this paper. Earthquake-resistant ability of slant-leg rigid-frame bridge is analyzed by means of response spectrum theory, and then the force and displacement of each vibration mode are discussed, thus seismic performance of bridge is analyzed. At the same time, the fatigue damage of ramp of slant-led rigid-frame bridge after the earthquake is analyzed by employing the SN curve. Experimental results show that the slant-leg rigid-frame has a certain seismic performance, however, the shortest place of fatigue life of bridge mainly focus on the arc and the top of the pier of the bridge. This study provides a reference to similar bridges for seismic researches and fatigue life prediction.