场地局部效应对地下管线的影响
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摘要
将实际地震动看作非平稳随机过程,地震动不仅具有时域非平稳性,而且具有频域非平稳性。SMART-1台阵地震记录分析结果已证实,地震时地面上各点在同一时刻的地震动时变自功率谱存在一定的差异。时变自功率谱的差异对地下连续管线的影响还不十分清楚。利用随机振动理论中的虚拟激励法计算了均匀介质中地下连续管线纵向和横向的地震响应,给出了场地局部效应对均匀介质中地下连续管线的影响。分析结果表明,场地局部效应对均匀介质中地下连续管线地震反应的影响很小。因此,实际计算时可忽略场地局部效应。
As stochastic process,seismic ground motions are considered non-stationary not only in time domain,but also in frequency domain.The analysis of data recorded at SMART-1 array has confirmed that there are some differences among the time-varying auto-spectral densities of seismic ground motions at different stations at the same time.The effect of the differences on the underground continuous pipelines in uniform medium is not very clear.In this paper,the seismic responses of the underground continuous pipelines in both longitudinal and lateral directions in uniform medium are studied by the pseudo-excitation method in random vibration theory,and then the impact of the locality effect on the underground continuous pipeline is analyzed.The results show that the locality effect has little impact on the seismic responses of the underground continuous pipelines in uniform medium.It is suggested that the locality effect can be neglected in practice.
As stochastic process,seismic ground motions are considered non-stationary not only in time domain,but also in frequency domain.The analysis of data recorded at SMART-1 array has confirmed that there are some differences among the time-varying auto-spectral densities of seismic ground motions at different stations at the same time.The effect of the differences on the underground continuous pipelines in uniform medium is not very clear.In this paper,the seismic responses of the underground continuous pipelines in both longitudinal and lateral directions in uniform medium are studied by the pseudo-excitation method in random vibration theory,and then the impact of the locality effect on the underground continuous pipeline is analyzed.The results show that the locality effect has little impact on the seismic responses of the underground continuous pipelines in uniform medium.It is suggested that the locality effect can be neglected in practice.
引文
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[3]屈铁军,王前信.地下管线在空间随机分布的地震作用下的反应[J].工程力学,2003,20(3):120-124.
[4]钟菊芳.重大工程场地地震动输入参数研究[D].南京:河海大学,2006.
[5]Loh C H,Yeh Y T.Spatial variation and stochastic modeling of seismic differential ground movement[J].Earthquake Engineering and StructuralDynamics,1988,16(4):583-596.
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[7]屈铁军.地面运动的空间变化特性研究及地下管线地震反应分析[D].哈尔滨:国家地震局工程力学研究所,1995.
[8]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55-62.
[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):39-46.
[10]屈铁军,王前信.空间变化的地震作用下地下管线弯曲振动反应的求解方法[J].工程力学,1997,14(3):88-96.
[11]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[12]Zerva A,Ang A S H,Wen Y K.Lifeline response to spatially variable ground motion[J].Earthquake Engineering and Structural Dynamics,1988,16(3):361-379.
[2]帅健,许葵.埋地管道的非平稳随机振动[J].工程力学,2002,19(5):130-134.
[3]屈铁军,王前信.地下管线在空间随机分布的地震作用下的反应[J].工程力学,2003,20(3):120-124.
[4]钟菊芳.重大工程场地地震动输入参数研究[D].南京:河海大学,2006.
[5]Loh C H,Yeh Y T.Spatial variation and stochastic modeling of seismic differential ground movement[J].Earthquake Engineering and StructuralDynamics,1988,16(4):583-596.
[6]王君杰.多点多维地震动随机模型及结构的反应谱分析方法[D].哈尔滨:国家地震局工程力学研究所,1992.
[7]屈铁军.地面运动的空间变化特性研究及地下管线地震反应分析[D].哈尔滨:国家地震局工程力学研究所,1995.
[8]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55-62.
[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):39-46.
[10]屈铁军,王前信.空间变化的地震作用下地下管线弯曲振动反应的求解方法[J].工程力学,1997,14(3):88-96.
[11]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[12]Zerva A,Ang A S H,Wen Y K.Lifeline response to spatially variable ground motion[J].Earthquake Engineering and Structural Dynamics,1988,16(3):361-379.
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