Effects of RC pile damage on vibration characteristics of piles and natural period of a structure were investigated based on liquefaction tests using a large scale laminar shear box. The behavior of the pile from the middle part to the pile head differed between the foreshock and the aftershock. The reduction of the rigidity of the piles that induced by the failure of the piles was a factor that gets the natural period of the structure to be long. The upper part of the pile vibrated integrally with the structure in the foreshock whereas the structure mainly vibrated in the aftershock. This means that the part of the pile that mainly vibrated became short. This was a factor that gets the natural period of the structure to be short. As a result of these factors, the natural period of the structure in the aftershock was almost the same as that in the foreshock.
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