脉冲型近场地震波反应谱的阻尼调整系数分析

蒲武川; 黄斌; KABANDOEK

doi:10.3969/j.issn.0258-2724.2017.02.009

脉冲型近场地震波反应谱的阻尼调整系数分析

doi: 10.3969/j.issn.0258-2724.2017.02.009

基金项目:

国家自然科学基金资助项目(51208405)

高速铁路建造国家工程实验室开放基金资助项目(HSR2013021)

详细信息

作者简介:
蒲武川(1980-),男,副教授,博士,研究方向为结构抗震与减震控制,E-mail:puwuchuan@whut.edu.cn

计量
- 文章访问数: 552
- HTML全文浏览量: 74
- PDF下载量: 137
- 被引次数: 0
出版历程
- 收稿日期: 2015-05-27
- 刊出日期: 2017-04-25

Damping Modification Factors for Response Spectra of Pulse-like Near-fault Ground Motions

摘要

摘要: 阻尼调整系数定量描述了阻尼比对结构地震响应的影响，与地震波频谱特征等相关，用于从低阻尼比反应谱推算高阻尼比反应谱。本文以近场脉冲型地震波为对象，研究其反应谱阻尼调整系数的规律并建立计算公式。选取50条脉冲型地震波并提取出等效低频脉冲，考虑0.05~0.50之间13种阻尼比，计算得到地震波、等效脉冲的反应谱和各自基于5%阻尼比的阻尼调整系数。研究结果表明，结构周期与地震波脉冲周期比T/Tp在 0.5~1.2内，提高阻尼比对位移、速度和加速度响应都有降低作用且减震效果最明显，等效脉冲与实测地震波的阻尼调整系数接近。对加速度、速度和位移谱分别拟合，得到了0.5 ＜ T/Tp ＜ 1.2范围内考虑脉冲周期Tp影响的阻尼调整系数评价公式。
- 阻尼调整系数 /
- 近场地震波 /
- 等效脉冲 /
- 反应谱
Abstract: The damping modification factor quantifies the effect of damping ratio on seismic response of a structure. It is related to the spectral characteristics of ground motion, and is used to obtain the high damping spectra from the low damping spectra. This work aims to explore the damping effect on structural responses induced by near-fault ground motions, and to propose estimation formulas for damping modification factor. A total of 50 ground motions were selected, and the wavelet-based equivalent pulses were extracted. The response spectra were calculated based on the selected ground motions and the equivalent pulses, with the assumed 13 damping ratios ranging from 0.05 to 0.50. The damping modification factors were obtained based on the reference spectra with a damping ratio of 0.05. The results show that increasing damping ratio reduces the spectral values the most significantly if the period ratio T/Tp (structural period to pulse period) is between 0.5 and 1.2, and in this range the same level of damping modification factors are obtained from the equivalent pulses. Based on the numerical results, the empirical functions were suggested for estimating the damping modification factor for acceleration, velocity and displacement, respectively. The proposed formulas take into account the near-fault effect, and are applicable within the period range of 0.5 ＜ T/Tp ＜ 1.2.
- damping modification factor /
- near-fault ground motion /
- equivalent pulse /
- response spectrum

HTML全文

参考文献(16)

European Committee for Standardization. European standard EN 1998-1:2004 eurocode 8: design of structures for earthquake resistance. part 1: general rules-seismic actions and general requirements for structures[S]. Brusells: Comite European de Normalisation, 2004.

Federal Emergency Management Agency. FEMA 273 NEHRP guidelines for the seismic rehabilitation of buildings[S]. Washington, D.C.: FEMA, 1997.

中国建筑科学研究院. GB50011-2010 建筑抗震设计规范[S]. 北京:中国建筑工业出版社, 2010.

STAFFORD PJ, MENDIS R, BOMMER J. Dependence of damping correction factors for response spectra on duration and numbers of cycles[J]. Journal of Structural Engineering, ASCE, 2008, 134(8): 1364-1373.

HAO A M, ZHOU D Y, LI Y M, et al. Effects of moment magnitude, site conditions and closest distance on damping modification factors[J]. Soil Dynamics and Earthquake Engineering, 2011, 31: 1232-1247.

LIN Y Y, CHANG K C. Study on damping reduction factor for buildings under earthquake ground motions[J]. Journal of Structural Engineering, 2003, 129(2): 206-214.

李明,谢礼立,杨永强,等. 基于反应谱的近断层地震动潜在破坏作用分析[J]. 西南交通大学学报, 2010, 45(3): 331-335. LI Ming, XIE Lili, YANG Yongqiang, et al. Potential damage analysis of near-fault ground motion based on response spectra[J]. Journal of Southwest Jiaotong University, 2010, 45(3): 331-335.

姚令侃,冯俊德,杨明. 汶川地震路基震害分析及对抗震规范改进的启示[J]. 西南交通大学学报,2009,44(3): 301-311. YAO Lingkan, FENG Junde, YANG Ming. Damage analysis of subgrade engineering in Wenchuan Earthquake and recommendations for improving seismic design code[J]. Journal of Southwest Jiaotong University, 2009, 44(3): 301-311.

邢帆,祝兵,赵灿晖. 近断层地震作用下大跨CFST拱桥的动力稳定性[J]. 西南交通大学学报,2012,47(3): 367-372. XING Fan, ZHU Bing, ZHAO Canhui. Dynamic stability of long-span CFST arch bridge under action of near-fault ground motions[J]. Journal of Southwest Jiaotong University, 2012, 47(3): 367-372.

International council of building officials. IBC1997 uniform building code[S]. Whittier: International Conference of Building Officials,1997.

ALAVI B, KRAWINKLER H. Consideration of near-fault effects in seismic design[C]//Proceedings of 12th World Conference on Earthquake Engineering. Auckland: The New Zealand Society for Earthquake Engineering, 2000: 2665.

MAKRIS N. Rigidity-plasticity-viscosity: can elctrorheological dampers protect base-isolated structures from near-source ground motions[J]. Earthquake Engineering and Structural Dynamics, 1997, 26: 571-591.

BAKER J W. Quantitative classification of near-fault ground motions using wavelet analysis[J]. Bulletin of the Seismological Society of America, 2007, 97(5): 1486-1501.

CHOPRA A. Dynamics of Structures: theory and applications to earthquake engineering: second edition[M]. New Jersey: Prentice-Hall Inc, 2006: 207-208.

BRAY J D, MAREK A R. Characterization of forward directivity ground motions in the near-fault region[J]. Soil Dynamics and Earthquake Engineering, 2004, 24: 815-828.

SEHHATIR, MAREK A R, ElGAWADY M, et al. Effects of near-fault ground motions and equivalent pulses on multi-story structures[J]. Engineering Structures, 2011, 33: 767-779.

施引文献

附加材料(0)

访问统计

点击查看大图

计量

文章访问数: 552
HTML全文浏览量: 74
PDF下载量: 137
被引次数: 0

脉冲型近场地震波反应谱的阻尼调整系数分析

doi: 10.3969/j.issn.0258-2724.2017.02.009

作者简介: 蒲武川(1980-),男,副教授,博士,研究方向为结构抗震与减震控制,E-mail:puwuchuan@whut.edu.cn

计量

出版历程

Damping Modification Factors for Response Spectra of Pulse-like Near-fault Ground Motions

计量

出版历程

目录

作者简介:
蒲武川(1980-),男,副教授,博士,研究方向为结构抗震与减震控制,E-mail:puwuchuan@whut.edu.cn