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跨海或库区的大跨度桥梁在地震作用下不仅需要考虑水体与桥墩的动力相互作用,同时由于各桥墩间跨度较大应考虑地震输入的行波效应。该文采用辐射波浪理论求解桥墩地震动水压力,建立了考虑地震动输入空间效应的深水桥梁地震响应分析方法,并考虑行波效应对深水连续刚构桥进行地震响应分析。研究表明:动水压力增大了桥梁结构的地震响应,其影响程度随着输入地震波和墩梁约束条件的不同而有所差异;考虑行波效应时地震动水压力对桥梁结构动力响应的影响较一致激励而言有所差别,同时地震动水压力对桥梁地震响应的影响随着视波速的不同而变化。由此得出结论,为合理评价地震动水压力对深水长大桥梁动力响应的影响应考虑地震动输入的行波效应。
The long-span bridges across the sea or the reservoir area not only need to consider the dynamic interaction between water body and piers under the action of earthquake, but also consider the traveling wave effect of seismic input due to the large span between the piers. In this paper, the radiative wave theory is used to solve the seismic water pressure of piers. The seismic response analysis method for deepwater bridges considering the effect of ground motion input is established. The seismic response analysis of deep water continuous rigid frame bridge is also given considering the traveling wave effect. The results show that the hydrodynamic pressure increases the seismic response of the bridge structure, and the degree of influence varies with the constraints of the input seismic wave and the pier beam. The influence of the seismic water pressure on the dynamic response of the bridge structure Which is different from the consistent excitation. At the same time, the influence of the water pressure on the seismic response of the bridge varies with the apparent wave velocity. Therefore, it is concluded that, in order to reasonably evaluate the effect of earthquake pressure on the dynamic response of deep-water bridge, the traveling wave effect of ground motion input should be considered.