EXPERIMENTAL RESEARCH ON RESONANT CHARACTERISTIC OF DEEPLY EMBEDDED CIRCULAR FOUNDATION-SUPERSTRUCTURE SYSTEM UNDER COMPOUNDED NONLINEAR CONDITIONS

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  • SAITOH Masato
    社団法人 土木学会 埼玉大学 工学部建設工学科
  • IKEGAME Masaki
    社団法人 土木学会 復建エンジニヤリング 第2技術部
  • TANAMURA Shirou
    社団法人 土木学会 鉄道総合技術研究所 鉄道技術推進センター
  • WATANABE Hiroyuki
    社団法人 土木学会 埼玉大学 工学部建設工学科

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  • 複合する非線形条件下における大型基礎の周波数応答特性に関する実験的研究

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The present study focuses on the resonant characteristic of a soil-deeply embedded circular foundation-superstructure system under compounded nonlinear conditions when subjected to lateral harmonic excitations. In this study, vibration tests are carried out. In the tests, the strain-dependent characteristic of soil layer, the boundary nonlinearity at the interfaces between the soil and foundation and the yielding of soil near the foundation are observed. It is concluded from the test results that, the shift of the predominant frequency toward the lower frequency region is mainly affected by the decrease in the stiffness of soil-foundation system due to the nonlinearity, rather than the effect of interaction between the soil-foundation system and the superstructure under small deflection condition.

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