Effects of Pile Damage on Seismic Response of Long-Period Structure During Soil Liquefaction

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The dynamic centrifuge tests of base-isolated structure supported by pile foundations were performed to evaluate the effects of damage to the pile and input ground motion characteristics on the seismic response of base-isolated structure.In the case where the long-period ground motion was input, the response of the seismic isolation building of the case of damaged pile was larger than the case of undamaged pile.Next, in order to study about the damage detection of the pile foundation, the system identification method based on subspace approach was applied to the acceleration data obtained by the centrifuge tests. The eigenmodes of the system were evaluated. In the mode of vibration of the ground is dominant, the amplitude of the footing of the damaged pile case was larger than that of the undamaged pile case. Thus, there is a possibility that can evaluate the damage to the pile by investigating the eigenmodes evaluated by this method.