Abstract
AbstractThe Daikai Station subway structure in Japan completely collapsed during the Hyogoken-Nanbu earthquake that occurred on January 17, 1995. Based on the numerical results obtained by two-dime...
Highlights
Due to the Hyogoken-Nanbu (Hanshin-Awaji) earthquake that occurred on January 17, 1995, in southwestern Japan, many people’s lives were lost, and many bridges and infrastructure components in the Kobe-Osaka area suffered severe damage
The significant damage to the Daikai Station subway structure shown in Fig. 2 was the first severe failure case worldwide used to modify the general practice of structural and geotechnical engineers regarding underground structures with better seismic performance than surface structures because underground structures that do not cross an active fault are influenced by the deformation of the surrounding ground if there is no liquefaction during an earthquake and if they have a smaller unit weight than that of the subsoil
A numerical simulation was performed by increasing the velocity of the input displacement from Vi 1⁄4 0.5 to 4 m=s for two durations of loading: T0=2 1⁄4 5 and 50 ms, as mentioned previously, with the former associated with high-frequency ground motion (100 Hz) excited prior to a lateral earthquake input and the latter associated with comparatively low-frequency motion (10 Hz)
Summary
Due to the Hyogoken-Nanbu (Hanshin-Awaji) earthquake that occurred on January 17, 1995, in southwestern Japan, many people’s lives were lost, and many bridges and infrastructure components in the Kobe-Osaka area suffered severe damage. The distribution of the time histories of displacement along two axes shows that the wave at the upper surface of the soil layer just below the base slab cannot propagate continuously to the lower points of the central column/sidewall, as in the case of a loading duration of T0=2 1⁄4 5 ms.
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