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Indexed by:期刊论文

Date of Publication:2017-01-01

Journal:JOURNAL OF CENTRAL SOUTH UNIVERSITY

Included Journals:SCIE、EI、Scopus

Volume:24

Issue:1

Page Number:203-216

ISSN No.:2095-2899

Key Words:offshore ground motion; vertical component; simplified design equation; vertical-to-horizontal response spectral ratio (V/H); vertical-to-horizontal peak ground acceleration ratio (V/H PGA ratio); K-NET network; seafloor earthquake measuring system (SEMS)

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.