Structural Engineering and Mechanics

  • 제42권1호
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  • Pages.121-129
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  • 2012
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
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Evaluating the effective spectral seismic amplification factor on a probabilistic basis

  • Makarios, Triantafyllos K. (Institute of Engineering Seismology and Earthquake Engineering)
  • 투고 : 2011.05.16
  • 심사 : 2012.02.29
  • 발행 : 2012.04.10
⟨ 이전 논문 다음 논문 ⟩

초록

All contemporary seismic Codes have adopted smooth design acceleration response spectra, which have derived by statistical analysis of many elastic response spectra of natural accelerograms. The above smooth design spectra are characterized by two main branches, an horizontal branch that is 2.5 times higher than the peak ground acceleration, and a declining parabolic branch. According to Eurocode EN/1998, the period range of the horizontal, flat branch is extended from 0.1 s, for rock soils, up to 0.8 s for softer ones. However, from many natural recorded accelerograms of important earthquakes, the real spectral amplification factor appears to be much higher than 2.5 and this means that the spectrum leads to an unsafe seismic design of the structures. This point is an issue open to question and it is the object of the present study. In the present paper, the spectral amplification factor of the smooth design acceleration spectra is re-calculated on the grounds of a known "reliability index" for a desired probability of exceedance. As a pilot scheme, the seismic area of Greece is chosen, as it is the most seismically hazardous area in Europe. The accelerograms of the 82 most important earthquakes, which have occurred in Greece during the last 38 years, are used. The soil categories are taken into account according to EN/1998. The results that have been concluded from these data are compared with the results obtained from other strong earthquakes reported in the World literature.

키워드

참고문헌

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  10. Tothong, P. and Luco, N. (2007), "Probabilistic seismic demand analysis using advanced ground motion intensity measures", Earthq. Eng. Struct. D., 36, 1837-1860. https://doi.org/10.1002/eqe.696
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피인용 문헌

  1. On the Torsional–Translational Response of Wind Turbine Structures vol.41, pp.4, 2016, https://doi.org/10.1007/s13369-015-1911-7
  2. Multi-time probability density functions of the dynamic non-Gaussian response of structures vol.76, pp.5, 2012, https://doi.org/10.12989/sem.2020.76.5.631