UPLIFT BEHAVIOUR OF SPREAD FOUNDATION STRUCTURES ON SAND AND CLAY DEPOSITS

Abstract

It is important to accurately estimate the effects of the building basemat uplift and structural response for strong earthquake motions in seismic design of nuclear power plant buildings. In this paper, dynamic centrifuge tests were performed using rigid structure on sand and clay deposits to investigate the difference of structure response due to difference in the bearing stratum, and effect of adhesion between basemat and clay deposit. It was shown that (1) the adhesion was effective in suppressing uplift; (2) the building on sand and clay deposit showed different earthquake response; (3) the JEAC equation for ground contact ratio gave a safe side estimation.