基于谐波合成法的多点人工地震动合成
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摘要
文章采用谐波合成法(WAWS法)模拟了空间变化的非平稳的地震加速度时程,通过对模拟结果的功率谱与目标功率谱密度进行比较,验证了谐波合成法的有效性和可行性。文章模拟的空间各点的地震加速度时程曲线既考虑了多点激励的行波效应,又考虑了地震动的空间相干性,用于计算大跨度结构在地震作用下的响应更加接近实际情况。
In this paper,the authors use spectral representation(WSWS method),and simulate non-stationary spatial correlative time histories of multi-point ground motion.Through comparing the power spectrum of the simulation results and the theory results,the harmonic synthesis are proved to be valid and feasible.The paper simulates space points of the earthquake acceleration-time curve and take not only the multi-point excitation wave effect into account,but also the spatial coherence of ground motion,which is used to calculate the long-span structures under earthquake response closer to reality.
In this paper,the authors use spectral representation(WSWS method),and simulate non-stationary spatial correlative time histories of multi-point ground motion.Through comparing the power spectrum of the simulation results and the theory results,the harmonic synthesis are proved to be valid and feasible.The paper simulates space points of the earthquake acceleration-time curve and take not only the multi-point excitation wave effect into account,but also the spatial coherence of ground motion,which is used to calculate the long-span structures under earthquake response closer to reality.
引文
[1]Zerva A,Zervas V.Spatial variation of seismic ground motions:An overview[J].Applied Mechanics Review,2002,55(3):271-297.
[2]Cluogh RW,Penzien J.结构动力学[M].王光远,译.北京:科学出版社,1983.
[3]Abahamson NA,Schneider JF,SteppJC.Empirical spatial coherency functions for applications to soil—structure interaction analyses[J]. Earthquake Spectra,1991(7):1-27.
[4]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):55-62.
[5]许谋奎,马人乐,张增军,等.空间相关多点地震动合成研究[J].低温建筑技术,2006(6):47-49.
[6]Scanlan R H,Sachs K.Earthquake time histories and response spectra [J].Journal of the Engineering Mechanics Division,1974,100 (EM4):635-655.
[7]G Deodatis.Simulation of ergodic multivariate stochastic processe [J].Journal of Engineering Mechanics,1996,122(8):778-787.
[8]胡聿贤,何训.考虑相位谱的人造地震动反应谱拟合[J].地震工程与工程振动,1986,6(2):37-50.
[2]Cluogh RW,Penzien J.结构动力学[M].王光远,译.北京:科学出版社,1983.
[3]Abahamson NA,Schneider JF,SteppJC.Empirical spatial coherency functions for applications to soil—structure interaction analyses[J]. Earthquake Spectra,1991(7):1-27.
[4]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):55-62.
[5]许谋奎,马人乐,张增军,等.空间相关多点地震动合成研究[J].低温建筑技术,2006(6):47-49.
[6]Scanlan R H,Sachs K.Earthquake time histories and response spectra [J].Journal of the Engineering Mechanics Division,1974,100 (EM4):635-655.
[7]G Deodatis.Simulation of ergodic multivariate stochastic processe [J].Journal of Engineering Mechanics,1996,122(8):778-787.
[8]胡聿贤,何训.考虑相位谱的人造地震动反应谱拟合[J].地震工程与工程振动,1986,6(2):37-50.
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