コンクリート表層部欠陥の定量的非破壊検査への打音法の適用  [in Japanese] QUANTITATIVE NONDESTRUCTIVE EVALUATION OF DEFECTS IN CONCRETE SURFACE LAYER BY IMPACT ACOUSTICS METHODS  [in Japanese]

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Abstract

本論文は, 打音法において得られる打音特性値 (最大振幅値・周波数分布) とコンクリート表層部欠陥の大きさおよび深さとの定量的関係について検討を行ったものである. 検討に際しては, まず, 打音法における打撃音と表面振動との相関に関する考察を行い, 両者を等価とみなし得ることを確認した. 次に, 大きさや表面からの深さが異なる人工欠陥を有する供試体において実験を行い, 欠陥なしの場合と比較することで欠陥の大きさおよび深さと打音特性値との定量的関係を明確にした. さらに, 2次元FEMによる数値解析により表面振動と欠陥情報との関係を把握し, 実験結果の妥当性を確認した. また, 本手法の実用化に向けて, 得られた打音特性値から欠陥情報を推定する手法に関する検討も行った.

This paper deals with Impact Acoustics methods to identify the sizes and vertical locations of defects in concrete. In this study, the maximum amplitude and frequency distribution, those were obtained from received elastic waveforms when concrete surface was impacted, were defined as ‘Impact Acoustics indices’ for defects evaluation. Quantitative relations between the Impact Acoustics indices and defects indices were both experimentally and analytically investigated. Influences of impact locations and concrete properties on the Impact Acoustics indices were also examined. As the results, it was revealed that the Impact Acoustics parameters used were very effective for quantitative evaluation of defects with taking consideration of impact locations on a concrete surface.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 704, 65-79, 2002-05-20

    Japan Society of Civil Engineers

References:  15

Cited by:  5

Codes

  • NII Article ID (NAID)
    10008534631
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    6177842
  • 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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