非一致地震激励下大跨度斜拉桥空间响应分析
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摘要
基于二维相干非一致激励功率谱模型,采用随机过程理论关于幅值、相位与功率谱的关系式,根据场地地震危险性评价和设计地震动参数合成人工地震波,考虑波动传播效应和多点激励效应,分析了某座跨长江的大跨度斜拉桥在地震激励下的空间非线性响应特性,计算了桥梁结构关键部位在地震力作用下的响应特性,并与一致激励下对应响应量进行比较,认为非一致激励下大跨斜拉桥关键部位的某些响应梁大幅增加,反应了进行非一致响应分析的必要性。
The artificial seismic waves were simulated according to seismic risk evolution and the earthquake parameters of the site,with the relationship between amplitude,phase angels and power spectra in stochastic process being used and a two-dimensional coherency function-an asynchronous excitation power spectral density(PSD) model being employed as well.A long-span cable-stayed bridge across Yangzi River subjected to the spatial seismic excitation was analyzed,during which course the effects of geometric nonlinear,traveling wave and multipoint excitation were considered.Several results of concerned sections under asynchronous excitation and synchronous excitation were supplied,between which comparison showed the some responses amplifying with asynchronous condition.Conclusions supported the necessity of asynchronous responses analysis.
The artificial seismic waves were simulated according to seismic risk evolution and the earthquake parameters of the site,with the relationship between amplitude,phase angels and power spectra in stochastic process being used and a two-dimensional coherency function-an asynchronous excitation power spectral density(PSD) model being employed as well.A long-span cable-stayed bridge across Yangzi River subjected to the spatial seismic excitation was analyzed,during which course the effects of geometric nonlinear,traveling wave and multipoint excitation were considered.Several results of concerned sections under asynchronous excitation and synchronous excitation were supplied,between which comparison showed the some responses amplifying with asynchronous condition.Conclusions supported the necessity of asynchronous responses analysis.
引文
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[2]林家浩,等.大跨度结构抗震分析发方法及近期进展[J].力学进展,2001,31(3):350~360.
[3]钟万勰,林家浩,等.大跨度桥梁分析方法的一些进展钟[J].大连理工大学学报,2000,40(2):127~135.
[4]项海帆.斜拉桥在行波作用下的地震反应分析[J].同济大学学报,1983,(2):1~9.
[5]陈幼平,周宏业.斜拉桥地震反应的行波效应[J].土木工程学报,1996,29(6):61~68.
[6]Abel-Ghaffar A M.Cab le-stayed bridge under se ism ic ac-tion[J].In:ItoM.ed.Cab le-stayed B ridges:RecentDevel-opm ent and The ir Future.Am sterdam:E lsevier Sc iencePub lishers,1991:171~191.
[7]Nazmy A S,Abel-Ghaffar A M.E ffects of ground motionsspatial variab ility on the response of cab le-stayed bridges[J].EESD,1992,(21):1~20.
[8]范立础,等.非一致地震激励下大跨度斜拉桥的响应特征[J].计算力学学报,2001,18(3):358~363.
[9]屈铁军,王前信.地下管线多点地震激励纵向振动的级数解[J].地震工程与工程振动,1993,13(4):39~45.
[10]屈铁军,王前信.空间相关的多点地震动合成[J].地震工程与工程振动,1998,18(1):8~15.
[11]赵灿晖.大跨度桥梁地震响应分析中的非一致地震激励模型[J].西南交通大学学报,2001,37(3):236~240.
[12]Hong Hao.Arch response to correlated multiple exc itation[J].EESD,1993,(22):389~404.
[13]Am in M,Ang A H S.Nonstationary stochastic model ofearthquake motions[J].ASCE,Eng.M ech.,1968,94(2):213~228.
[14]谢开仲,秦荣,王建军.大跨度钢管混凝土拱桥地震反应分析[J].中南公路工程,2005,30(2):15~19.
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