等価線形解析パラメータに及ぼす地震動のひずみレベルと繰返し回数の影響  [in Japanese] EFFECTS OF STRAIN LEVEL AND NUMBER OF CYCLES OF SEISMIC MOTIONS ON EQUIVALENT LINEAR MODEL  [in Japanese]

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Abstract

表層地盤の地震応答を精度良く評価することは耐震設計上重要な課題である. 地盤の非線形性が増大するような場合, 等価線形解析法の適用が困難といわれているが, 等価線形解析の適用範囲を広げることができれば, 実務的には非常に有効である. 本研究では, まず不攪乱試料を用いた動的変形特性試験から, 動的変形特性に与えるせん断ひずみと載荷繰返し回数の影響を把握し, 等価線形解析に用いられている最大せん断ひずみから有効せん断ひずみへの換算係数を地震動のせん断ひずみの大きさと繰返し回数から与える方法を提案した. そして, 5地点の鉛直アレー観測記録を用いて, その妥当性を検証した.

For earthquake resistant design, especially against seismic motions, it is very important to estimate ground surface motions during earthquake. It is well known that equivalent linear method cannot be applied easily to seismic response analysis in cases of strong seismic motions with severe nonlinear behaviors. However, this method may be useful in practice if its applicability comes more extended with good precision to strong seismic motions of ground. In the study, shear strain levels and number of cycles of loading, which may have effects on modulus and damping factor of dynamic deformation property of soil, have been examined with the data obtained by cyclic deformation test using undisturbed soil samples. Then, the conversion ratio from maximum strain to effective strain used to decide the modulus and the damping factor in the equivalent linear method can be given simply in an expression of the strain amplitudes and the number of cycles of the seismic motions. The proposed expression in the method has shown good applicability to simulate the vertical array records of seismic observations at five sites.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 701, 197-209, 2002-03-21

    Japan Society of Civil Engineers

References:  23

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008001693
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    6100753
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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