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Vertical-to-horizontal response spectral ratio for offshore ground motions: Analysis and simplified design equation

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Abstract

In order to study the differences in vertical component between onshore and offshore motions, the vertical-to-horizontal peak ground acceleration ratio (V/H PGA ratio) and vertical-to-horizontal response spectral ratio (V/H) were investigated using the ground motion recordings from the K-NET network and the seafloor earthquake measuring system (SEMS). The results indicate that the vertical component of offshore motions is lower than that of onshore motions. The V/H PGA ratio of acceleration time histories at offshore stations is about 50% of the ratio at onshore stations. The V/H for offshore ground motions is lower than that for onshore motions, especially for periods less than 0.8 s. Furthermore, based on the results in statistical analysis for offshore recordings in the K-NET, the simplified V/H design equations for offshore motions in minor and moderate earthquakes are proposed for seismic analysis of offshore structures.

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Authors and Affiliations

  1. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, China

    Bao-kui Chen  (陈宝魁), Dong-sheng Wang  (王东升), Hong-nan Li  (李宏男) & Chao Li  (李超)

  2. Road and Bridge Engineering Institute, Dalian Maritime University, Dalian, 116026, China

    Dong-sheng Wang  (王东升) & Zhi-guo Sun  (孙治国)

Authors
  1. Bao-kui Chen  (陈宝魁)
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  2. Dong-sheng Wang  (王东升)
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  3. Hong-nan Li  (李宏男)
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  4. Zhi-guo Sun  (孙治国)
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  5. Chao Li  (李超)
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Corresponding author

Correspondence to Dong-sheng Wang  (王东升).

Additional information

Foundation item: Project(2011CB013605) supported by the National Basic Research Development Program of China (973 Program); Projects(51178071, 51008041) supported by the National Natural Science Foundation of China; Project(NCET-12-0751) supported by the New Century Excellent Talents Program in University of Ministry of Education of China

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Chen, Bk., Wang, Ds., Li, Hn. et al. Vertical-to-horizontal response spectral ratio for offshore ground motions: Analysis and simplified design equation. J. Cent. South Univ. 24, 203–216 (2017). https://doi.org/10.1007/s11771-017-3421-0

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  • DOI: https://doi.org/10.1007/s11771-017-3421-0

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