群杭基礎の動的な鉛直復元力特性について : 杭基礎の動的挙動に関する研究

概要

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The results and theoretical examinations of static and dynamic loading tests of piles are presented herein. The single steel pile (φ = 152.4mm, t = 5.0mm) and 3×3 steel pile group were used, and the static cyclic loading tests in the vertical direction and the dynamic test on the pile group in the same direction using the vibration generator were performed. From these tests, the static and dynamic restoring force characteristics were obtained. The results of these tests were compared and examined with the theoretical study. The theoretical study was performed by using the elastic wave theory and by newly introducing the boundary interacting element. The elastic wave theory shown by T. Nogami, where the soil was considered as a linear visco-elastic layer with the hysteresis damping was employed here. By comparing the experimental resoring force characteristics with the theoretical one, it was recognized that the dynamic effects of pile group have significant influences on the stiffness and particularly on the damping. The magnitude of the boundary interacting effect between the pile and the soil was obtained from the static test and indicated by the complex stiffness. The restoring force characteristics which were obtained by adding the boundary interacting effect to the result of the elastic wave theory were shown to be good agreement with the experimental results.
社団法人日本建築学会の論文
1990-01-30