臺灣博碩士論文加值系統

本研究進行以應力波之非破壞檢測探討當混凝土內含鋼筋時，當不同鋼筋性質對應力波波傳之影響。應力波檢測試驗包括敲擊回音法、垂直位移與水平位移探頭直接波速量測法，以鋼筋正上方及平行於鋼筋正上方位置進行檢測。
研究結果發現：在直接波速量測法中，(1)逐漸增加敲擊源至第一探頭距離，量測得波速會因鋼筋存在而逐漸遞增。(2)較細的鋼筋，在敲擊源與接收探頭距離過遠時，量得波速下降。(3)較深的鋼筋檢測需縮短敲擊源與接收探頭距離，(4)平行於鋼筋上方量測，平行5cm以內皆仍受鋼筋影響。在敲擊回音法中：於鋼筋握裹情況出現瑕疵時，明顯出現混凝土表面薄層之特殊撓曲振動模式，是一判斷鋼筋是否已經完全失去握裹力很好的特徵。

This thesis studies the properties of stress wave propagation in the concrete structures bars using the nondestructive testing methods. The nondestructive testing methods included the impact-echo method and the direct transient elastic wave velocity testing method, in which both the horizontal displacement and the vertical displacement transducers were used in the direct wave velocity testing.
The experimental results indicate that: in the direct wave velocity testing (1) There is a significant variation of wave speeds obtained by gradually increasing the distance between the impactor and first displacement transducer, from which some characteristics of the reinforcing bars in the concrete can be identified.(2) While the size of the reinforcing bar is small and the distance between the impactor and the displacement transducers is too long, the signal of stress wave propagating along the reinforcing bar is hard to receive such that the wave was propagating from the concrete. Thus a sudden drop of wave speed was observed. (3)While the position of reinforcing bar is deep,we need to decrease the distance between the impactor and the displacement transducers to get a reasonable result. (4) The results of direct wave velocity testing will still be affected by the existence of reinforcing bars if both the impactor and the displacement transducers are located in region between two lines with 5 cm parallel to the longitudinal edge of reinforcing bars.In the impect-echo method: While there is a long horizontal hollow void in the concrete slab, at the beginning portion of wave propagating diagram in the time domain, there exists a short-period waveform. This unique feature of waveform indicates the special flexural vibration model between the outer surface of concrete slab and the top surface of hollow void in the concrete. This characteristic of waveform can be used to justify if the debonding of reinforcing bar has been occurred.

第一章緒論
1.1研究背景與研究動機1.2 研究範圍1.3 研究項目及流程
第二章 文獻回顧及試驗原理
2.1敲擊回音法2.2 雙位移探頭檢測
第三章 試驗計畫
3.1 試驗內容3.2 試體設計與製作3.3 儀器設備
第四章 結果分析與討論
4.1材料基本性質4.2純混凝土版塊試驗結果4.3含鋼筋之混凝土版塊試驗結果
第五章 結論與建議
5.1結論5.2建議

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2.Sansalone, M. and N. J. Carino, “Pulse-Echo Method for Flaw Detection in Concrete,” Technical Note 1199, National Bureau of Standards, July (1984)
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