Attenuation relationships and spectrum characteristic are significant difference between long-period ground motions and ordinary-period ground motions,and because of the lack of reliable records of long-period ground motions,the research at home and abroad is not enough,however the research of the effect of long-period ground motions to hydrodynamic pressure and dynamic response of rectangular piers is less than that of ordinary-period ground motions.Thus,the spectral character of long-period ground motions and ordinary-period ground motions in this paper are studied,along with studies of a time-history analysis based on potential fluid theory on a typical entity rectangular pier and the effect of long-period ground motions to hydrodynamic pressure of the rectangular,with the result showing that the hydrodynamic pressure has different tendency along the pier.The maximum shearing force and bending moment at the bottom of the pier and the maximum acceleration and displacement on the top of the pier in different water depths are also studied,and the greatest effect rate of long-period ground motions are 59.6%,57.2%,37.5% and 76.6% in 20 m deep water.%长周期地震动的衰减关系和频谱特性与普通周期地震有明显差异,并且由于缺乏可靠的长周期地震动记录,目前国内外对长周期地震动的研究尚不成熟,然而对长周期地震作用下矩形桥墩的动水压力和墩身动力响应研究也较少.基于此,对长周期地震波与普通地震波进行了频谱特性分析,并基于势流体理论,针对一典型实体矩形桥墩进行了长周期地震反应分析,研究了长周期地震波与普通地震波作用对桥墩动水压力的影响规律,得出桥墩的动水压力沿高度呈现出不同的变化趋势.基于不同水深对长周期地震波与普通地震波作用下结构的墩底剪力、墩底弯矩、墩顶最大加速度和墩顶最大位移的计算结果进行比较研究,得出长周期地震作用下桥墩的响应较大,且最大值都发生在水深20m时,分别增大59.6%,57.2%,37.5%和76.6%.
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