Response analysis of cable-stayed bridge tower under combined action of earthquake and wave
In order to study the response law and failure mechanism of the sea-crossing bridge under the action of earthquake and wave,a cable-stayed bridge was selected as the research object.Three seismic waves,namely El-centro wave,Taft wave,and Tianjin wave,were selected,which were suitable for three different types of sites.Different seismic peak accelerations were combined with anhydrous,8 m water depth,16 m water depth,and 24 m water depth to form different working conditions.The dynamic time-history analysis and Pushover analysis on cable-stayed bridges under combined action of earthquake and wave effects were carried out,and the analysis results of the two methods were compared.The results show that under the combined action of earthquakes and waves,the larger the peak value of seismic acceleration,the smaller the relative impact of hydrodynamic pressure on the response of cable-stayed bridge towers.The deeper the water depth,the greater the impact of hydrodynamic pressure on the tower of the cable-stayed bridge.In low sea conditions with shallow water depths,seismic forces dominate.In deep sea conditions with high water depths,wave forces dominate.The Pushover method is consistent with the results of dynamic time-history analysis.When analyzing the nonlinear response of cable-stayed bridges under the combined action of earthquakes and waves,the Pushover analysis method has high accuracy and simpler calculation,so it is more suitable for engineering practice.
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