Earthquake and wave action may be applied to bridges crossing sea in deep water at the same time, it is very important to analyze the dynamic responses of bridges in deep water under earthquake and wave action, besides, this problem is not well solved. Taking a common bridge pier in deep water as an example, the wave action effect on the seismic response of this pier is investigated. The analysis method of the seismic response of this pier considering wave action is established. The dynamic response analyses of this pier under 3 working conditions that contain the earthquake action only, wave action only and earthquake action considering wave action are then conducted. The major conclusions are that, the dynamic responses of bridge pier in deep water are increased because of earthquake induced hydrodynamic pressure,and the influence of hydrodynamic pressure is related to the spectral characteristics of earthquake waves. Compared to the seismic response value ,the wave action response value of this pier is very small. But the seismic response difference between considering wave action and not considering is very big. Seismic responses of bridge in deep water considering wave action can not be obtained by combining seismic response and wave action dynamic response by superposition.%跨海深水桥梁会受到地震和波浪的共同作用，研究地震和波浪共同作用下的深水桥梁动力响应问题具有非常重要的意义，并且该问题一直没有得到很好解决。本文以某典型深水桥墩为例，研究波浪作用对深水桥墩地震响应的影响。首先建立了考虑波浪作用下的深水桥墩地震响应分析方法，然后针对仅地震作用、仅波浪作用、同时考虑波浪作用下的地震作用3种情况对该桥墩进行动力响应分析。分析结果表明，动水压力增大了深水桥墩的地震响应，其影响程度与输入地震波的频谱特性有关；波浪响应值比地震响应值小；但考虑波浪作用前后的桥墩地震响应值变化较大，考虑地震作用下的深水桥墩地震响应不是两者独立作用下动力响应简单的叠加。
展开▼
