SCREENING OF INCIDENT PLANE WAVES BY A CYLINDRICAL FOUNDATION

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概要

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• The importance of seismic observation for evaluation of soil-structure interaction has been emphasized. To fully understand the meaning of recordings on and around the building foundation, however, we must first explore the nature of the ground surface motion near the foundation. In this paper the boundary element method is used to analyse the ground surface motion around a cylindrical foundation subjected to incident body and Rayleigh waves. The study shows that, a shadow zone is formed behind the foundation on the opposite side of the incident waves, in which the ground surface motion is smaller than that of the free field motion in high frequency range. When the non-dimensional frequency a_0≧2 (or the ratio of the foundation's radius to the wavelength of incident waves a/λ≧0.3), there will be a remarkable reduction of amplitudes. For incident body waves, when incident angle and the embedment ratio of the foundation become larger, the corresponding reduction effect becomes greater. For incident Rayleigh waves, the reduction of amplitudes is very pronounced and the bound of the reduction extends widely, regardless of the embedment ratio. The plane distribution of the reduction range and the effect of the flexibility of the foundation on the reduction have also been analysed. Afore-mentioned phenomenon can be interpreted in terms of screening of incident waves by the foundation. The experimental studies on the isolation effect of a screen aiming to decrease vibration of structure backed up these analytical conclusions.

• 社団法人地盤工学会の論文
• 1989-12-15

著者

• 栗林 栄一

  Dept.of Architecture And Civil Eng. Toyohashi University Of Technology

• 蒋 通

  Tongji University

• 栗林 栄一

  Toyohashi University of Technology

• 蒋 通

  Institute Of Structural Theory Tongji University

• 蒋 通

  Tongji University:toyohashi University Of Technology

関連論文

• 地震による資産別損害の分布性状に関する研究〔英文〕
• 砂層の流動化判定手法に関する一研究
• 可とう性継ぎ手を有する埋設管路の耐震設計式の改善と提案
• The Three-Dimensional Resonance of Axisymmetric Sediment-Filled Valleys(蒋通他著本誌28巻4号 1988年掲載)
• 円筒形基礎の入射平面波に対するスクリーン効果(『土質工学会論文報告集』Vol. 29,No.4 (1989年12月発行)掲載論文の概要)
• SCREENING OF INCIDENT PLANE WAVES BY A CYLINDRICAL FOUNDATION
• THE THREE-DIMENSIONAL RESONANCE OF AXISYMMETRIC SEDIMENT-FILLED VALLEYS
• DYNAMIC RESPONSES OF FLEXIBLE RECTANGULAR FOUNDATIONS EMBEDDED INTO A VISCOELASTIC HALF-SPACE TO OBLIQUELY INCIDENT WAVES
• 短期間を対象とする確率地震荷重の推定法〔英文〕

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