近断层地震动竖向分量峰值特性研究
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摘要
对收集到的近断层(断层距不大于15 km)地震动竖向分量进行分类后建立样本库,采用最小二乘回归方法,建立统计分析模型,对竖向地震动的峰值加速度、峰值速度及峰值位移进行回归分析;建立峰值参数与震级和断层距的衰减关系式及其相关系数,与其他研究者及近断层地震实际记录的峰值参数进行对比。结果表明,推荐的峰值衰减关系式与实际结果吻合较好,近断层竖向地震动高频波显著,随断层距衰减较快,为下一步近断层竖向地震动的研究奠定了基础。
A sample library was built after the collected vertical components of near-fault(the distance to the fault is no more than 15 km) ground motions were categorized.The least square regression method was used to create a statistical analysis model for regression analysis of the PGA,PGV and PGD of vertical ground motions.The attenuation relationship between the peak parameters and the motion level/the distance to the fault as well as relevant coefficients were established;a comparison was made with the results of other researchers and actual near-fault ground motion records.The result shows that the proposed peak attenuation relationship matches the actual results.High-frequency waves are significant in the vertical component of near-fault ground motions and attenuate fast with the distance to the fault.Our work lays a foundation for further study on the vertical component of near-fault ground motions.
A sample library was built after the collected vertical components of near-fault(the distance to the fault is no more than 15 km) ground motions were categorized.The least square regression method was used to create a statistical analysis model for regression analysis of the PGA,PGV and PGD of vertical ground motions.The attenuation relationship between the peak parameters and the motion level/the distance to the fault as well as relevant coefficients were established;a comparison was made with the results of other researchers and actual near-fault ground motion records.The result shows that the proposed peak attenuation relationship matches the actual results.High-frequency waves are significant in the vertical component of near-fault ground motions and attenuate fast with the distance to the fault.Our work lays a foundation for further study on the vertical component of near-fault ground motions.
引文
[1]中华人民共和国建设部.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[2]BOZORGNIAY M,NIAZI M.Characteristics of free ver-tical ground motion during the Northridge earthquake[J].Earthquake Spectra,1995,11:515-525.
[3]CAMPBELLKW.Empirical near-source attenuation re-lationships for horizontal and vertical components of peakground acceleration,peak ground velocity and pseudo-absolution response spectra[J].Seismological ResearchLetter,1997,68:154-179.
[4]李新乐,窦慧娟,朱②,等.近断层强震地面运动幅值与持时特性研究[J].地震动工程与工程振动,2009,29(4):1-6.
[5]李新乐.近断层区桥梁结构的设计地震与抗震性能研究[D].北京:北京交通大学,2005:130-153.
[6]AMBRASEYS N N,DOUGLAS J.Near-field horizontaland vertical earthquake ground motions[J].Soil Dynam-ics and Earthquake Engineering,2003,23:1-18.
[2]BOZORGNIAY M,NIAZI M.Characteristics of free ver-tical ground motion during the Northridge earthquake[J].Earthquake Spectra,1995,11:515-525.
[3]CAMPBELLKW.Empirical near-source attenuation re-lationships for horizontal and vertical components of peakground acceleration,peak ground velocity and pseudo-absolution response spectra[J].Seismological ResearchLetter,1997,68:154-179.
[4]李新乐,窦慧娟,朱②,等.近断层强震地面运动幅值与持时特性研究[J].地震动工程与工程振动,2009,29(4):1-6.
[5]李新乐.近断层区桥梁结构的设计地震与抗震性能研究[D].北京:北京交通大学,2005:130-153.
[6]AMBRASEYS N N,DOUGLAS J.Near-field horizontaland vertical earthquake ground motions[J].Soil Dynam-ics and Earthquake Engineering,2003,23:1-18.
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