Seismic response analysis of small-radius curved girder bridge

Take the bridge of one freeway interchange ramp as an example,built a space beam finite element model of the curved girder bridge.Research on the seismic input,structural dynamic characteristics,seismic input direction and the combination method.Contrast with the straight bridge,the analysis result shows that the curved bridge structure is complex and vibration mode is disperse in quality distribution.The pier internal force is susceptive to seismic input direction.It is suitable to input multiple direction seismic input and combine the analysis result.