近断层地震动作用下长周期结构的地震动强度指标
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摘要
选取国内外13次地震的26个近断层地震动记录,研究适用于长周期结构的地震动强度指标.采用时程分析法计算了自振周期3.0～8.0 s的单自由度结构的加速度、速度和位移响应,研究了峰值加速度、均方根加速度、峰值速度、均方根速度、峰值速度与峰值加速度比、峰值位移和均方根位移与这些响应最大值的相关性.在此基础上以宿迁某高层隔震建筑为对象,进一步考察实际长周期结构的最大地震响应与地震动强度指标的相关性.研究结果表明:不同地震动强度指标与长周期结构最大响应的相关性差别很大,加速度型地震动强度指标的相关性最差,速度型强度指标随着结构周期的增加其相关性愈差,位移型强度指标随着结构周期的增加其相关性愈好.相比峰值加速度和峰值速度强度指标,近断层地震动作用下长周期结构时程分析时,选择位移型地震动强度指标用于选择和调整地震动输入更为合理.
26 suites of near-fault ground motions which are collected in the 13 earthquakes were adopted to investigate the ground motion intensity indices applicable for long period structures.The acceleration,velocity and displacement responses of SDOF systems with the natural period from 3.0 to 8.0 s were calculated using the time history analysis.Then the correlations between the maximum responses and the ground motion intensity indices including the peak ground acceleration,root-mean-square of acceleration,peak ground velocity,root-mean-square of velocity,the ratio of peak ground velocity to peak ground acceleration,peak ground displacement,root-mean-square of displacement were analyzed.Furthermore,the correlation between the maximum responses of a high-rise isolation building in Suqian and these intensity indices were analyzed.The results show that the different intensity indices have various correlations with the maximum responses of long period structures.The correlations of acceleration-related intensity indices are the worst and the correlations of velocity-related intensity indices become worse with the increase of period,whereas the correlations of displacement-related intensity indices show high linearity with the increase of period.In contrast to the peak ground acceleration and peak ground velocity,displacement-related intensity indices are more reasonable to be used for selecting and adjusting ground motion inputs for time history analysis of long period structures subjected to near-fault motions.
26 suites of near-fault ground motions which are collected in the 13 earthquakes were adopted to investigate the ground motion intensity indices applicable for long period structures.The acceleration,velocity and displacement responses of SDOF systems with the natural period from 3.0 to 8.0 s were calculated using the time history analysis.Then the correlations between the maximum responses and the ground motion intensity indices including the peak ground acceleration,root-mean-square of acceleration,peak ground velocity,root-mean-square of velocity,the ratio of peak ground velocity to peak ground acceleration,peak ground displacement,root-mean-square of displacement were analyzed.Furthermore,the correlation between the maximum responses of a high-rise isolation building in Suqian and these intensity indices were analyzed.The results show that the different intensity indices have various correlations with the maximum responses of long period structures.The correlations of acceleration-related intensity indices are the worst and the correlations of velocity-related intensity indices become worse with the increase of period,whereas the correlations of displacement-related intensity indices show high linearity with the increase of period.In contrast to the peak ground acceleration and peak ground velocity,displacement-related intensity indices are more reasonable to be used for selecting and adjusting ground motion inputs for time history analysis of long period structures subjected to near-fault motions.
引文
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[3]Mavroeidis G P,Papageorgiou A S.A mathematical rep-resentation for near-fault ground motions[J].Bulletin ofthe Seismological Society of America,2003,93(3):1099-1131.
[4]Neumann F.Some new concepts of strong earthquake mo-tion[J].Geological Society of America Bulletin,1952,63(12):1355-1356.
[5]Housner G W,Jennings P C.The capacity of extremeearthquake motions to damage structures[C]//Structur-al and Geotechnical Mechanics:A Volume Honoring Na-than M Newmark.Englewood Cliffs,New Jersey,USA:Prentice Hall,1977:102-116.
[6]Riddell R.On ground motion intensity indices[J].Earthquake Spectra,2007,23(1):147-173.
[7]郝敏,谢礼立,李伟.基于砌体结构破坏损伤的地震烈度物理标准研究[J].地震工程与工程振动,2007,27(5):27-32.Hao Min,Xie Lili,Li Wei.Study on physical measure ofseismic intensity based on damage to masonry structures[J].Journal of Earthquake Engineering and EngineeringVibration,2007,27(5):27-32.(in Chinese)
[8]叶列平,马千里,缪志伟.结构抗震分析用地震动强度指标的研究[J].地震工程与工程振动,2009,29(4):9-22.Ye Lieping,Ma Qianli,Miao Zhiwei.Study on earth-quake intensities for seismic analysis of structures[J].Journal of Earthquake Engineering and Engineering Vi-bration,2009,29(4):9-22.(in Chinese)
[9]Takewaki I,Tsujimoto H.Scaling of design earthquakeground motions for tall buildings based on drift and inputenergy demands[J].Earthquake and Structures,2011,2(2):171-187.
[10]Kramer S L.Geotechnical earthquake engineering[M].Upper Saddle River,New Jersey,USA:Prentice-Hall,1996.
[11]Sucuoglu H,Nurtug A.Earthquake ground motion char-acteristics and seismic energy dissipation[J].Earth-quake Engineering and Structural Dynamics,1995,24(9):1195-1213.
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