The Vertical and Horizontal Spectra of Near-Fault Ground Motions

Abstract:

Based on the horizontal and vertical components of a set of 30 acceleration records obtained from 10 near-fault earthquakes, the horizontal and the vertical response spectra are established, and have been compared with each other in this study. Statistical analyses show that, for the selected 30 acceleration records, the maximum mean of vertical acceleration spectra is slightly higher than which of horizontal acceleration spectra. That means the near-fault earthquake really have significant vertical effect. Consulting the domestic and international research achievement, the normalized near-fault design spectrum adapted to Chinese seismic design Code (GB50011-2010) is established in horizontal direction. The results show that, within short period range, the horizontal near-fault design spectrum obtained in this paper is obviously higher than which derived from Chinese seismic code. Subsequently, the spectra of horizontal components for the selected 30 records are each scaled to match the horizontal near-fault design spectrum at two periodic points of 1.0 and 1.5 sec respectively, and the corresponding vertical spectra are scaled with the horizontal spectra at the same time. The scaled results reveal that the vertical spectra have much higher discretion than horizontal spectra, hence the study in this paper could initiates the research interest to a new aspect concerned with the randomness of vertical spectra for near-fault ground motions, which would affect the seismic reliability of structures significantly.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 3335-3339
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.3335
• Online since: October 2012
• Authors: Jiang Yin*, Xian Yan Zhou, Guo Jing He
• Keywords: Near-Fault, Response Spectra, Vertical Ground Motion

References

[1] J. F. Hall, T. H. Heaton, M. W. Halling, et al.: Near-source ground motions and its effects on flexible buildings. Earthquake Spectra, Vol. 11, No. 4(1995), pp.569-605

DOI: 10.1193/1.1585828

[2] J. Yin. The study of seismic demand estimation method of reinforced concrete structures [Doctor Dissertation]. Changsha: Hunan University(2011), pp.45-55 (In Chinese)

[3] International Council of Building Officials: 1997 Uniform Building Code (International conference of building officials, Whittier, California 1997).

DOI: 10.2172/5624815

[4] L. J. Xu, L. L. Xie. Study on seismic design spectra of near-fault region. Chin. Journal Of Southeast University (Natural Science Edition) ．Vol. 35, No. SⅠ(2005), pp.105-108 (In Chinese)

[5] Y. L. Li, H. J. Dou, J. G. Sun, Spectrum of seismic design code for zones lack of near-fault strong earthquake record. Acta Seismologica Sinica. Vol.29, No.4(2007), pp.419-425 (In Chinese)

DOI: 10.1007/s11589-007-0447-7