Uplift Behaviour of Spread Foundation Structures Embedded in Clay Deposit

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 clay deposits embedded with clay to investigate the difference of structure response due to difference in the embedded stratum, and effect of adhesion between basemat and clay deposit. It was shown that (1) the embedment and the adhesion were effective in suppressing uplift; (2) the JEAC equation for ground contact ratio gave a safe side estimation.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 clay deposits embedded with clay to investigate the difference of structure response due to difference in the embedded stratum, and effect of adhesion between basemat and clay deposit. It was shown that (1) the embedment and the adhesion were effective in suppressing uplift; (2) the JEAC equation for ground contact ratio gave a safe side estimation.

Centrifuge Testing and Seismic Response Analysis for Uplift Behavior of Spread Foundation Structures on Rock

“…For the seismic design of a nuclear power plant, analytical studies on non-linear rocking behavior have been conducted [e.g., Muto and Kobayashi (1979), Yamada and Kawamura (1984), Shimomura (1988), Yano et al (1991), and Nakamura et al (2016)]. Moreover, experimental studies using shaking table or centrifugal tests have been conducted [e.g., Yano et al (1983), Hangai et al (1986Hangai et al ( , 1987, Ishikawa et al (2007), Imamura et al (2014), and Imamura et al (2013)]. There are analytical and experimental studies on other types of buildings too [e.g., Midorikawa et al (2009), Ishihara et al (2009), andNakamura et al (2014)].…”