| In this paper,the main span of a cable-stayed bridge in Shanghai is 420 m.The main beam structure of the bridge is simplified,which makes the calculation more simple and time-saving.In this paper,the seismic response of cable-stayed bridge is analyzed by using the extensive general finite element software ANSYS,and the seismic analysis of the construction process of the cable-stayed bridge is carried out.The main research contents are as follows:(1)According to the principle of maximum stress,maximum deflection and equal mass,the equivalent simplified beam model is proposed for the main beam structure of steel box girder,and the cable-stayed bridge is gradually simplified as the fish belly type main beam structure model.(2)The finite element model of the cable-stayed bridge under the condition of completed bridge is analyzed,and the structural natural vibration characteristics of the bridge are analyzed.Two analysis methods,response spectrum and time history analysis,are used to calculate the seismic response of four different combinations of seismic waves,including longitudinal,longitudinal + vertical,transverse + vertical and longitudinal + transverse + vertical,and the results are compared and analyzed.(3)According to the arrangement sequence of stay cables,each stage of the cable-stayed bridge is divided into 24 bridge models,and the seismic response during the construction of the cable-stayed bridge is analyzed.When the stay cables are applied to the auxiliary piers,the internal force and displacement are both at the maximum value,then the internal force decreases,and the displacement value drops sharply.(4)Considering the nonlinear analysis of geometry,material and contact,the finite element model of cable-stayed bridge with and without pile and fish belly structure is analyzed under the rare earthquake.The results show that the longitudinal displacement of the main tower is larger,while the transverse displacement of the main beam is smaller. |
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