【摘要】 基于辐射波浪理论和Morison方程分别求解地震动水压力和波浪效应对桥墩的作用,建立了能够同时考虑动水压力和波浪作用的桥梁动力平衡方程;利用Sap2000软件建立非隔震和隔震两种全桥结构有限元模型,考虑地震、地震与动水压力共同作用、地震与动水压力及波浪共同作用三种工况,分别输入七条地震动进行分析,取最大值的平均值来进行比较和分析,研究动水压力和波浪效应对桥梁地震反应的影响。研究表明:动水压力改变了桥梁的动力特性,增大了桥梁的地震反应;波浪效应对桥梁地震反应的影响比动水压力的影响小,对隔震桥梁的地震反应影响几乎可以忽略,对非隔震桥梁影响较大。三种工况下,隔震桥梁的地震反应均小于非隔震桥梁的地震反应。更多还原

【Abstract】 Based on the radiation wave theory and the Morison equation,a dynamic equilibrium equation of bridge taking the hydrodynamic pressure and the wave action into account is given. The finite element models of the nonisolated and isolated bridge have been established by using the software Sap2000. Three loading conditions have been considered including earthquake,hydrodynamic pressure,and wave action. Seven earthquake ground motions have been input respectively to do the analysis. The peak values of the seismic responses of the bridge under the seven input ground motions have been averaged and used to analyze the effect of hydrodynamic pressure and wave action on the seismic responses of the bridge. The study shows that after considering the hydrodynamic pressure the dynamic characteristics of the bridge will change and the seismic responses will increase. The wave action has a less effect on the seismic response of the bridge than the hydrodynamic pressure. The wave action effect on the isolated bridge is so small that it may be ignored,but it is greater on the non-isolated bridge. In all of the three loading conditions,the seismic responses of the isolated bridge are always less than those of the non-isolated bridge.更多还原