近场脉冲型地震动位移比谱特征研究
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摘要
非弹性位移比谱是估计工程结构非弹性位移一种简单而有效的方法。以大量的地震动记录为基础,研究近场脉冲型地震动位移比谱的特征,同时考察场地条件、峰值地面速度与峰值地面加速度比(PGV/PGA)、峰值地面速度(PGV)和最大增量速度(MIV)对近场地震动位移比谱的影响。结果表明近场地震动的脉冲作用在0.2～1.5s的周期段对位移比谱的影响最大,在此周期段,位移比谱增大了近20%左右;在其他周期段,近场地震动的脉冲作用对位移比谱的影响不明显。通过研究不同地震动参数对近场位移比谱的影响发现,峰值地面速度与峰值地面加速度比(PGV/PGA)是影响近场地震动位移比谱最大的参数,场地条件对近场地震动位移比谱的影响不大。
The displacement ratio spectra method is a simple and effective way to evaluate the maximum inelastic displacements of structures.The characteristics of displacement ratio spectra for near-field ground motions are investigated based on a great number of earthquake ground motions.The effects of site condition,ratio of peak ground velocity to peak ground acceleration(PGV/PGA),peak ground velocity(PGV)and maximum incremental velocity(MIV)on displacement ratio spectra are also evaluated.It is concluded that the effect of near-field ground motions on displacement ratio spectra is significant at periods between 0.2~1.5 s,where the amplifications can approach 20%.However,the effect is not obvious in other period ranges.PGV/PGA can provide the largest influence on displacement ratio spectra for near-field ground motions.It is also found that site condition has small effect on inelastic displacement ratio spectra for near-field ground motions.
The displacement ratio spectra method is a simple and effective way to evaluate the maximum inelastic displacements of structures.The characteristics of displacement ratio spectra for near-field ground motions are investigated based on a great number of earthquake ground motions.The effects of site condition,ratio of peak ground velocity to peak ground acceleration(PGV/PGA),peak ground velocity(PGV)and maximum incremental velocity(MIV)on displacement ratio spectra are also evaluated.It is concluded that the effect of near-field ground motions on displacement ratio spectra is significant at periods between 0.2~1.5 s,where the amplifications can approach 20%.However,the effect is not obvious in other period ranges.PGV/PGA can provide the largest influence on displacement ratio spectra for near-field ground motions.It is also found that site condition has small effect on inelastic displacement ratio spectra for near-field ground motions.
引文
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[2]Baez J I,Miranda E.Amplification factors to estimate inelastic displacement demands for the design of structures in the near field[C]//Proceedings of the12th Word Conference on Earthquake Engineering.Paper No.1561.Auckland,NewZealand:NewZealandSocietyforEarthquake Engineering,2000
[3]Iwan W D,Huang C T,Guyader A C.Important features of the response of inelastic structures to near-field ground motion[C]//Proceedings of the12th Word Conference on Earthquake Engineering.Paper No.1740.Auckland,New Zealand:NewZealand Society for Earthquake Engineering,2000
[4]Pincheira J A,Song J K.Displacement amplification factors for degrading systems subjected to near-fault ground motions[C]//Proceedings of the12th Word Conference on Earthquake Engineering.Paper No1945.Auckland,New Zealand:NewZealand Society for Earthquake Engineering,2000
[5]Jalali R S,Trifunac M D,Amiri G G,et al.Wave-passage effects on strength-reduction factors for design of structures near earthquake faults[J].Soil Dynamics and Earthquake Engineering,2007,27(8):703-711
[6]黄建文,朱晞.近震作用下单自由度结构的非弹性响应分析研究[J].中国安全科学学报,2003,13(11):59-65(Huang Jianwen,Zhu Xi.Inelastic response analysis for the SDOF structures under near-field earthquakes[J].China Safety Science Journal,2003,13(11):59-65(in Chinese))
[7]翟长海.最不利设计地震动及强度折减系数研究[D].哈尔滨:哈尔滨工业大学,2004(Zhai Changhai.Study on the Severest Design Ground Motions and the Strength Reduction Factors[D].Harbin:Harbin Institute of Technology,2004(in Chinese))
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