In order to investigate the practical use of the seismic deformation method in liquefiable ground, the questionnaire was conducted for structural engineers. The following were concluded. The ground deformation was not considered for the secondary design in the lateral resistance of the pile foundation. There was a difference among structural engineers for the estimation of ground deformation and the reduction of soil reaction spring. A simple design method that is considered of the effect of ground deformation will be needed for aseismic design of the pile foundation.
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