Seismic response analysis of embedded structure at Hualien, Taiwan

Predictive and correlative analyses of the forces vibration tests ('FVT' for short, hereafter) and seismic response of the large-scale embedded structure were performed as one of the analytical phases of an international large-scale seismic test (LSST) program (Tang et al., 1991) at Hualien, Taiwan. Consequently, the following was clarified; (1) FVT analysis using unified ground model (UMFVT2) predicted the fundamental system frequency (f₀) about 20% higher than the test. (2) After careful investigation on several items cited as the presumed causes of f₀ discrepancy between the test and the prediction, it was attributed to the V_s of the backfill, and best correlated ground model (BCFVT2) was formed, based on it. (3) Seismic response analysis using BCFVT2 brought a bit better agreement with the observation than using UMFVT2, but from another viewpoint, both analysis results agreed fairly well with the observation, indicating that backfill V_s does not affect seismic response so much as during FVT.