| FFW Bridge is a rail-cum-road cable-stayed bridge, which lies in high earthquake intensity zone of the upper and middle Yangtze River, the span of the bridge is(60+156+464+156+60)m. Structural dynamic characteristics and the seismic behaviors of the bridge were studied, main work and achievements of this paper is as follows:1、According to the structure characteristics of FFWB, the bearings effect of pile-soil interaction were studied. The Space finite element model of the bridge was established. Structural dynamic characteristics were studied.2、Using the standard seismic response spectrum, the seismic responses of the bridge to response spectrum analysis were studied. The stresses and displacements of structural crucial sections under common earthquake and rare earthquake were studied. Besides, seismic behaviors of the bridge were evaluated.3、Using Taft-69°seismic wave, the seismic responses of the bridge to time history analysis were studied. The stresses and displacements of the structural crucial sections under common earthquake, design earthquake and rare earthquakes were studied. Besides, seismic safety and ductility of the bridge were evaluated.4、For seismic responses and time history analysis of the calculation results are compared, time history analysis of the results is slightly big than the seismic responses in each level under the action of earthquake.5、the strength of the main beam,tower, pier and pile foundation satisfies the demands under the common earthquake; Only some of the bridge pier pile and the Angle of pile foundation in the outlying regions stress overrun under the rare earthquake. Bridge can meet the requirements of no damage under frequent earthquake and no collapse under rare earthquake.The achievements of this paper can serve design of this bridge and provide references for other similar structures. |
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