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.

A simple evaluation method for amplification of response spectrum by surface strata is proposed. The proposed method does not require any time history of design ground motion. That means the proposed method can be utilized in response and limit capacity calculation. In the proposed method, the response spectrum of design ground motion is converted to equivalent power spectrum density. The transfer function of surface strata is evaluated by one dimensional elastic wave propagation theory. The power spectrum density at ground surface is converted to response spectrum using peak factor. The good accuracy is achieved in evaluation of response spectrum amplification.

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.

No abstract

A dynamic experiment of a RC structure model supported by PC piles built in a RC container was conducted using E-Defense shaking table in order to investigate failure process of pile-supported buildings. The model was built in a scale of 1:2.5. Various levels of input motions were applied to the model. A large number of useful data were obtained from small input tests where both a structure and piles were undamaged and large input tests where pile heads were damaged like actual damage in past large earthquakes.