Seismic response analysis of local layered sea reef site

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (21) : 55-64.

BAO Xin1, LIU Jingbo1, WANG Dongyang2, LI Shutao1, WANG Fei1

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Abstract

Here, comprehensively considering dynamic coupling action between reef and seawater, wave radiation effects at cutoff boundaries of solid and fluid media as well as seismic wave input, a 2-D seismic response analysis model for local layered reef-seawater system was established to study seismic field distribution laws of reef site by comparing with horizontal stratification site and slope platform site in land area.Results showed that seismic response amplitude of reef site is significantly amplified compared with that of horizontal layered site, the acceleration peak amplification coefficient near the middle point of reef top can reach 1-1.5, and that near the corner point can reach 1.5-2; topographic factors, such as, seaward slope and reef flat width, and reef-seawater dynamic coupled effect have significant influences on seismic response of island reef site, seismic response analyses of a 1-D soil layer and slope platform site are difficult to fully describe real distribution characteristics of seismic field of island reef site; for important reef engineering sites, it is necessary to perform a reef-seawater coupled dynamic analysis for the purpose of reflecting their real mechanical characteristics.

Key words

reef / seawater / site seismic response / seismic wave input / artificial boundary / fluid-solid interaction

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BAO Xin1, LIU Jingbo1, WANG Dongyang2, LI Shutao1, WANG Fei1. Seismic response analysis of local layered sea reef site[J]. Journal of Vibration and Shock, 2020, 39(21): 55-64

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