非一致地震激励下大跨斜拉桥非线性响应计算
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摘要
基于随机过程理论关于幅值、相位与功率谱的关系式,采用二维相干非一致激励功率谱模型,根据场地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了比较。认为非一致激励下大跨斜拉桥关键部位的某些响应量大幅增加,反应了进行非一致响应分析的必要性。
The artificial seismic waves were simulated according to 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 and asynchronous excitation power spectral density(PSD) model employed as well.A long-span cable-stayed bridge across the 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 provided,comparison of which showed the some responses amplifying with asynchronous condition.Conclusions supported the necessity of(asynchronous) responses analysis.
The artificial seismic waves were simulated according to 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 and asynchronous excitation power spectral density(PSD) model employed as well.A long-span cable-stayed bridge across the 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 provided,comparison of which showed the some responses amplifying with asynchronous condition.Conclusions supported the necessity of(asynchronous) responses analysis.
引文
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[12]HAO HONG.Arch response to correlated multiple excitation[J].Eart-hquake Engineering and Structural Dynamics,1993,22:389-404.
[13]AMIN M,ANG A H S.Nonstationary stochastic model of earthquakemotions[J].Engineering Mechanics,ASCE,1968,94(2):213-228.
[2]林家浩,等.大跨度结构抗震分析方法及近期进展[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[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,1983,11(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.Cable-stayed bridge under seismic action[C]∥In:ITO M,et al.Cable-stayed Bridges:Recent Development andTheir Future.Amsterdam:Elsevier Science Publishers,1991:171-191.
[7]NAZMY A S,ABEL-GHAFFAR A M.Effects of ground motions spatialvariability on the response of cable-stayed bridges[J].Earthquake En-gineering and Structural Dynamics,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]HAO HONG.Arch response to correlated multiple excitation[J].Eart-hquake Engineering and Structural Dynamics,1993,22:389-404.
[13]AMIN M,ANG A H S.Nonstationary stochastic model of earthquakemotions[J].Engineering Mechanics,ASCE,1968,94(2):213-228.
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