Seismic Design be Based on Response Analysis of Basement Rock

Abstract eng:
This paper indicates that a realistic seismic design should be based on a response analysis of the basement rock. The different seismic waves change from the input waves on the basement rock as they pass through the various strata on their way to the surface, causing damage to structures and the like on the ground. When transmitted through multiple intermediate soft layers, waves with low acceleration and relatively long periods develop and generate particularly large deformation on the ground surface, resulting in liquefaction of saturated sandy layers. Waves transmitted through hard intermediate layers, however, have high acceleration and short periods when they reach the surface, generating a powerful force and these are likely to have a significant impact on structures. The seismic design of important structures on soft ground should take account of deformation and displacement and those on hard ground should mainly consider stress and ductility based on dynamic analyses. An analysis for seismic design should be performed from hard basement rock with a shear velocity of greater than 2 km/sec.

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