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研究生:唐兢
研究生(外文):Tang, Jing-Kuen
論文名稱:混凝土握裹力之非破壞評估---聲波法的應用
論文名稱(外文):Nondestructive evaluation of bond strength of concrete---an acoustic approach
指導教授:江支弘江支弘引用關係
指導教授(外文):Chiang, Chih-Hung
學位類別:碩士
校院名稱:朝陽大學
系所名稱:營建工程研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:96
中文關鍵詞:握裹力非破壞評估
外文關鍵詞:bond strengthnondestructive evaluation
相關次數:
  • 被引用被引用:2
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  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
一般在做有關鋼筋混凝土握裹力之研究時,拉拔試驗是一種常用的方法,然而,在做老舊橋樑的現場檢測時,通常不便採用拉拔實驗,緣此,本研究的目的,即藉由拉拔試驗與聲波穿透法(through transmission)的合併使用,分析兩者之間的關連性,作為進一步發展非破壞握裹強度試驗的基礎。
在拉拔試驗的過程中,記錄拉拔力、聲波以及聲波訊號的強度,並採用不同的混凝土配比成分。在鋼筋拔出前,隨著拉拔力的逐漸提高,鋼筋的滑移與劈裂除了造成周圍混凝土的開裂,且進一步導致應變軟化,而使聲速逐漸降低。由試驗結果顯示,當握裹力達到握裹強度百分之八十的時候,有百分之八十八的可能性聲速下降百分之四十以下。經由聲速的降低比例可推測拉拔力與握裹強度的相對關係,可應用於結構安全的評估。
訊號強度(峰值電壓)隨著握裹強度之接近也呈現減弱的趨勢,但因為試體先天的非均質性而使得訊號強弱變化非常不穩定。若要做進一步的討論,則必須將訊號由時間領域先做適度之濾波處理,再透過快速傅利葉轉換(Fast Fourier Transform, FFT)的處理,在頻率領域上做訊號的分析討論,以找出聲波訊號與握裹力的關係。
One of the major safety issues concerning the bond stress of mortar and concrete elements under external loads has been investigated. Since concrete is an inhomogeneous material, current study combines pull-out test and nondestructive acoustic through-transmission to lay the ground for future on-site inspection.
The relation between bond stress and acoustic wave velocity has been analyzed. Changes of acoustic wave velocity were observed as the bond stress exceeded a certain level. As the external pull-out load (transferred to induced bond stress) increases, the acoustic wave velocity decrease. This phenomenon becomes very significant as the pull-out load approaches maximum bond strength of the specimen. The acoustic velocity at 90% of maximum bond strength is less than 80% of that without applied load. There is a greater than 90% chance that 70% of maximum bond strength is exceed as the acoustic wave velocity is at 70% of that without applied load. Structural safety of concrete elements can then easily be determined by using this bond stress-acoustic wave velocity relation.
Changes were also observed for signal intensity, which could be obtained from the time-domain acoustic wave response during the through-transmission test. Future study will include filtering of time-domain acoustic wave response, followed by frequency spectrum analysis. However, it will be up to more through investigation before true wave propagation and attenuation mechanism can be understood.
第一章 緒論
1.1簡介
1.2 研究動機
第二章 文獻回顧及問題定義
2.1 鋼筋混凝土握裹力之研究
2.2 聲波法之應用
2.2.1 聲波檢測法之分類
2.2.2 超音波於混凝土之應用
2.2.3 影響波速的因素
2.3 問題定義
第三章 試驗規劃
3.1 試驗材料
3.2 試體材料之配比
3.3 試驗內容及項目
3.4 試驗設備與裝置方式
3.5 試驗方法
3.5.1 拉拔試驗
3.5.2 聲波穿透試驗
3.5.3 抗壓強度試驗
第四章 試驗結果與討論
4.1 拉拔試驗
4.2 聲波穿透試驗
4.3 抗壓強度試驗
第五章 結論與建議
5.1 結論
5.2 建議
參考文獻
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