国家体育场在多点激励作用下的地震反应分析
|
摘要
地震地面运动是一复杂的时-空过程,严格来说所有结构的地震反应分析均应考虑地震动空间变异性的影响,尤其是当结构规模和平面尺寸较大时,这种差动效应就更加明显,由此引起的结构反应与一致激励相比有所不同。本文基于相位差谱生成非平稳空间地震动场后,进行了国家体育场在多点激励下的地震反应分析,并将计算结果与一致激励的结果进行了对比。结果显示:水平地震作用下多点激励作用方向上的位移反应多小于一致激励的,多点激励作用下非激励方向的位移大于一致激励的;竖向地震作用下的变形在多点激励时较大。基底剪力和基底弯矩在多点激励作用下的反应较一致激励的小。
The earthquake ground motion is a complicated time-space process and may be different at different supports of large-span structures. Significant progress on the relevant issues has been made, and studies on the response of large span structures have shown that the effects of multi-support excitations should be considered. In this paper, the responses of the national stadium of the 2008 Olympic game in Beijing under uniform excitation and multiple support excitations are studied by using the time history analysis method. Spatially variable ground motion time histories are simulated. It is found that the uniform ground motion cannot represent the most critical case for the response of the national stadium structure. The assumption of multiple support excitations may be realistic and result in larger deformation when under vertical earthquake motion and smaller shear force and bending moment at the base.
The earthquake ground motion is a complicated time-space process and may be different at different supports of large-span structures. Significant progress on the relevant issues has been made, and studies on the response of large span structures have shown that the effects of multi-support excitations should be considered. In this paper, the responses of the national stadium of the 2008 Olympic game in Beijing under uniform excitation and multiple support excitations are studied by using the time history analysis method. Spatially variable ground motion time histories are simulated. It is found that the uniform ground motion cannot represent the most critical case for the response of the national stadium structure. The assumption of multiple support excitations may be realistic and result in larger deformation when under vertical earthquake motion and smaller shear force and bending moment at the base.
引文
[1]Bonganoff J L,Goldberg J E,Schiff A J.The effect of ground transmission time on the response of long structures[J].Bull Seism Soc Am,1965,55:627-640
[2]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(Xiang Haifan.Earthquake response analysis of cable-stayed bridges under the action of travelling waves[J].Journal of Tongji University,1983,11(2):1-9(in Chinese)).
[3]陈幼平,周宏业.斜拉桥地震破坏的计算研究[J].地震工程与工程振动,1995,15(3):127～134(Chen Youping,Zhou Hongye.Seismic damage and collapse of cable-stayed bridges[J].Earthquake Engineering and Engineering Vibration,1995,15(3):127-134(in Chinese))
[4]Edward L W.Three-Dimensional Static and Dynamic Analysis of Structures[M],Computers and Structures,Inc.2002,12:234-249
[5]杨庆山,姜海鹏,陈英俊.基于相位差谱的时频非平稳人造地震动的生成[J].地震工程与工程振动,2001,21(3):10-16(Yang Qingshan,Jiang Haipeng,Chen Yingjun.Generation of ground motion non-stationary both in time and frequency domains based on phase difference spectrum[J].Earthquake Engineering and Engineering Vibration,2001,21(3):10-16(in Chinese))
[6]杨庆山,姜海鹏.基于相位差谱的时频非平稳人造地震动的反应谱拟和[J].地震工程与工程振动,2002,22(1):32-38(Yang Qingshan,Jiang Haipeng.Generation of response-spectrum compatible ground motions based on phase-difference spectrum[J].Earthquake Engineering and Engineering Vibration,2002,(22)(1):32-38(in Chinese))
[7]Kiureghian A D.A coherency model for spatially varying ground motions[J].Earthquake Engineering and Structural Dynamics,1996,25:99-111
[8]Harichandran R S.Estimation the spatial variation of earthquake ground motion from dense array recording[J].Structural Safety,1991,10:219-233
[9]刘先明.大跨度空间网格结构多点输入反应谱理论的研究与应用[D].南京:东南大学,2003(Liu Xianming.Theoretic Research and Application of Response Spectrum of Long Span Space Reticulated Structures Under Multiple Support Excitations[D].Nanjing:Southeast University,2003(in Chinese))
[10]Thráinsson H,Kiremidjian A S.Simulation of digital earthquake accelerograms using the inverse discrete Fourier transform[J].Earthquake Engineering and Structural Dynamics,2002,31:2023-2048
[2]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(Xiang Haifan.Earthquake response analysis of cable-stayed bridges under the action of travelling waves[J].Journal of Tongji University,1983,11(2):1-9(in Chinese)).
[3]陈幼平,周宏业.斜拉桥地震破坏的计算研究[J].地震工程与工程振动,1995,15(3):127～134(Chen Youping,Zhou Hongye.Seismic damage and collapse of cable-stayed bridges[J].Earthquake Engineering and Engineering Vibration,1995,15(3):127-134(in Chinese))
[4]Edward L W.Three-Dimensional Static and Dynamic Analysis of Structures[M],Computers and Structures,Inc.2002,12:234-249
[5]杨庆山,姜海鹏,陈英俊.基于相位差谱的时频非平稳人造地震动的生成[J].地震工程与工程振动,2001,21(3):10-16(Yang Qingshan,Jiang Haipeng,Chen Yingjun.Generation of ground motion non-stationary both in time and frequency domains based on phase difference spectrum[J].Earthquake Engineering and Engineering Vibration,2001,21(3):10-16(in Chinese))
[6]杨庆山,姜海鹏.基于相位差谱的时频非平稳人造地震动的反应谱拟和[J].地震工程与工程振动,2002,22(1):32-38(Yang Qingshan,Jiang Haipeng.Generation of response-spectrum compatible ground motions based on phase-difference spectrum[J].Earthquake Engineering and Engineering Vibration,2002,(22)(1):32-38(in Chinese))
[7]Kiureghian A D.A coherency model for spatially varying ground motions[J].Earthquake Engineering and Structural Dynamics,1996,25:99-111
[8]Harichandran R S.Estimation the spatial variation of earthquake ground motion from dense array recording[J].Structural Safety,1991,10:219-233
[9]刘先明.大跨度空间网格结构多点输入反应谱理论的研究与应用[D].南京:东南大学,2003(Liu Xianming.Theoretic Research and Application of Response Spectrum of Long Span Space Reticulated Structures Under Multiple Support Excitations[D].Nanjing:Southeast University,2003(in Chinese))
[10]Thráinsson H,Kiremidjian A S.Simulation of digital earthquake accelerograms using the inverse discrete Fourier transform[J].Earthquake Engineering and Structural Dynamics,2002,31:2023-2048
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心