THE THREE-DIMENSIONAL RESONANCE OF AXISYMMETRIC SEDIMENT-FILLED VALLEYS

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概要

• 論文の詳細を見る

• The effect of sediment-filled valley on seismic ground motion has become of major interest recently. In this paper the boundary element method (BEM) is used for the response analyses of axisymmetric valleys subjected to incident waves, and the vibration characteristics of the valleys are investigated in detail. The errors resulting from using the full-space fundamental solutions and the finite model simulation are theoretically clarified. The axisymmetric problems are solved by considering the cyclic symmetry of the coefficient matrix and introducing a transformation. The case studies are performed for examining the effects of the shape ratio, the impedance contrast, the oblique incidence of body waves, the Rayleigh wave incidence and the valley damping on the resonance characteristics. The main conclusions are as follows. The specific resonance patterns of valleys exhibit two modes, namely the shear modes and bulk modes. The frequency of resonance modes is shown to depend only on two parameters : the one-dimensional resonance frequency at the valley center and the shape ratio, regardless of the incident wave field and impedance contrast. The fundamental resonance amplitudes depend on the shape ratio and the impedance contrast. The proposed empirical formulas for estimating the fundamental resonance frequencies and the maximum fundamental resonance amplitudes at the valley center are verified by numerical examples for valleys with different shapes and extensive impedance contrast.

• 社団法人地盤工学会の論文
• 1988-12-15

著者

• 栗林 栄一

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

• 栗林 栄一

  Toyohashi University of Technology

• 蒋 通

  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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