长周期地震对矩形桥墩动水压力及墩身动力响应的影响
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摘要
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%.
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.
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.
引文
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[2]庄昆元,徐永林,沈建文.台湾大地震长周期波对上海的影响研究[J].地震学报,1997,19(6):634-639.
[3]廖述清,裴星洙,周晓松,等.长周期地震动作用下结构的弹塑性地震反应分析[J].建筑结构,2005,35(5):24-27.
[4]谢礼立,周雍年,胡成祥.地震动反应谱的长周期特性[J].地震工程与工程振动.1990,10(1):1-18.
[5]臧明明,陈清军.长周期地震动的场地效应与大跨桥梁结构的动力响应分析[J].结构工程师,2010,26(1):118-125.
[6]吴琼,陈清军.高层框架结构长周期地震反应分析[J].结构工程师,2011,27(1):79-84.
[7]Lian Z H.Modern CAE Technology and Application Manual[M].Beijing:Petroleum Industry Press,2004.
[8]Boore D M.Effect of baseline corrections on displacements and response spectra for several recordings of the 1999Chi-Chi,Taiwan,earthquake[J].Bulletin of the Seismological Society of America,2001,91(5):1199-1211.
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