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研究生:黃洸駿
研究生(外文):Guang-Jun Huang
論文名稱:以敲擊回音法測漸變斷面混凝土厚度之可行性
論文名稱(外文):The Measurement of Varied Thickness Plate by Impact Echo
指導教授:鄭復平鄭復平引用關係
指導教授(外文):Fu-Ping Cheng
學位類別:碩士
校院名稱:國立交通大學
系所名稱:土木工程系
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:2003
畢業學年度:91
語文別:中文
中文關鍵詞:敲擊回音法厚度
外文關鍵詞:Impact EchoThickness
相關次數:
  • 被引用被引用:4
  • 點閱點閱:261
  • 評分評分:
  • 下載下載:29
  • 收藏至我的研究室書目清單書目收藏:1
本論文主要研究目的是利用敲擊回音時間領域的訊號分析技術,於接收探頭中的位移波形嘗試判斷反射內P波到達的時間,並利用所量測到的P波波速,來計算漸變斷面的厚度。本研究採用表面P波、內P波、與圓柱試體敲擊回音頻率域所得之P波,來檢驗P波之波速。研究結果顯示,由內P波所推求到的厚度最準,但是此法於現地實際狀況下恐因對面有障礙物而不能做對向量測;不過,以表面P波所推求出的厚度,其誤差值亦有在5%以內,且此法只需單面量測波速。所以,以敲擊回音時間域的技術來判斷漸變斷面的厚度,是有一定之可行性的。
The objective of this thesis is to use the technique of impact echo in time domain to get insight into P-wave and use the measured speed of P-wave to determine the thickness of varied thickness plate. The measured speeds of P-wave in my study include surface P-wave, internal P-wave and P-wave measured from cylinder which taking core from the plate in frequency domain. The results of study show that the estimated thickness by impact echo in time domain is feasible especially using the speed of internal P-wave but it is not feasible in true situation. However, the measurement of speeds from surface P-wave solves the problem and the error can be controlled in 5%.
總 目 錄
頁次
中文摘要.................................................... I
英文摘要................................................... II
致謝...................................................... III
目錄...................................................... Ⅳ
圖目錄.................................................... Ⅶ
表目錄.................................................... ⅩI
目 錄
第一章 導論................................................ 1
1-1 序言................................................ 1
1-2 品質檢驗............................................ 3
1-3 研究動機............................................ 4
1-4 論文架構............................................ 5
第二章 文獻回顧............................................ 6
2-1 混凝土版狀結構厚度之檢測技術........................ 6
2-1.1 超音波法....................................... 6
2-1.2 敲擊回音法..................................... 7
第三章 檢測原理........................................... 13
3-1 應力波動基本行為之介紹............................. 13
3-2 波速的量測......................................... 17
3-2.1 雷利波(R 波)波速之量測........................ 17
3-2.2 壓力波(內P波)波速之量測....................... 17
3-2.3 表面P波速度之量測 (ASTM波速量測法)............ 18
3-3 厚度的量測......................................... 19
3-3.1 頻率域法...................................... 19
3-3.2 時間領域法.................................... 19
第四章 試體規劃製作與儀器設備............................. 21
4-1 試體規劃製作....................................... 21
4-2 儀器設備........................................... 22
4-3 分析軟體參數....................................... 23
4-3.1 取樣間隔...................................... 24
4-3.2 記錄長度...................................... 24
4-3.3 頻率解析度.................................... 25
第五章 試驗程序與結果..................................... 27
5-1 試體測點相關資料之測定............................. 27
5-2 波速的量測......................................... 27
5-2.1 雷利波(R波)波速之量測......................... 28
5-2.2 表面壓力波(P波)波速之量測..................... 28
5-2.3 內部壓力波(內P波)波速之量測................... 29
5-2.4 敲擊回音法波速之量測.......................... 29
5-3 厚度的推測......................................... 30
5-3.1 應力波行走路徑之修正 ........................ .30
5-3.2 邊界對R波的影響 ............................ ..31
5-3.3 訊號的取得、判讀與厚度推估 .............. .....31
5-3.4 部分第二個接收器於測點右邊的原因........... ...32
第六章 結論與討論......................................... 34
6-1 結論............................................... 34
6-2 誤差討論........................................... 35
6-3 未來努力方向....................................... 37
參考文獻................................................... 38
圖 目 錄
頁次
圖2-1 不同超音波檢測探頭擺置位置........................... 45
圖2-2 敲擊回音試驗示意圖................................... 46
圖2-3 應力波反射示意圖(a) Z2>Z1 (b) Z2<Z1................. 46
圖2-4 敲擊回音法於混凝土版試驗示意圖
(a) 敲擊回音試驗示意圖
(b) 壓力波及張力波之示意圖
(c) 表面位移之示意圖............................. ... . 47
圖2-5 擷取探頭慣性之波形................................... 48
圖2-6 來回反射P波造成之厚度模式(thickness mode) ............. 48
圖2-7 ASTM C1383 P波波速及版厚量測法
(a) P 波波速量測示意圖及位移波形圖
(b) 敲擊回音法示意圖及頻譜圖......................... 49
圖3-1 應力波動行為示意圖................................. . 50
圖3-2 Snell’s Law 示意圖................................. . 51
圖3-3 敲擊回音頻率分析原理示意圖......................... . 52
圖3-4 檢測R波波速之示意圖
(a) 儀器配置示意圖
(b) 第一接收器位移波形示意圖
(c) 第二接收器位移波形示意圖....................... . 53
圖3-5 檢測內P波波速之示意圖
(a) 儀器配置示意圖
(b) 第一接收器位移波形示意圖
(c) 第二接收器位移波形示意圖..........................54
圖3-6 檢測混凝土版表面P波波速之示意圖
(a) 儀器配置示意圖
(b) 第一接收器位移波形
(c) 第二接收器位移波形............................... 55
圖3-7 混凝土試體厚量測示意圖
(a) 儀器配置示意圖
(b) 第一接收器位移波形
(c) 第二接收器位移波形.............................. . 56
圖4-1 擋土牆試體示意圖..................................... 57
圖4-2 (a)敲擊回音試驗儀器
(b)探頭接收端為點接觸................................ 58
圖4-3 力量-時間函數圖...................................... 59
圖4-4 不同取樣率的波形圖
(a)一個週期之正弦波;(b)以三個點表示;
(c) 以五個點表示;(d) 以十個點表示.................... 59
圖5-1 混凝土試體網格打設與實際厚度量測過程
(a) 試體打完網格
(b) 架設鋼柱與拉緊細繩
(c) 量左右邊試體到細繩距離
(d) 量預測量之點到細繩距離........................... 60
圖5-2 各試體實際厚度量測結果與將來探頭配置位置圖....... ... 61
圖5-3 混凝土版表面P﹑R波波速之檢測結果波形圖
(a)儀器配置示意圖
(b)第一接收器紀錄之位移波形
(c)第二接收器紀錄之位移波形.......................... 62
圖5-4 實際內P波波速之量測結果圖
(a)儀器配置圖
(b)第一接收器位移波形圖
(c)第二接收器位移波形圖.............................. 63
圖5-5 圓柱試體敲擊回音測試
(a) 敲擊試驗儀器配置圖
(b) 位移波形圖
(c) 經FFT轉換後之頻譜圖.............................. 64
圖5-6 試體鑽心過程
(a) 鑽心儀器鑽心進行時
(b) 儀器搬移後鑽心處俯視圖
(c) 取出試體前先用工具將試體折斷
(d) 取出試體......................................... 65
圖5-7 試體切割過程
(a) 混凝土試體切割機
(b) 試體架設細部與進行切割
(c) 混凝土試體切割完成............................... 66
圖5-8 應力波行走路徑修正.................................. 67
圖5-9 試體一測試圖〝括弧內為測點座標〞.................. 68
圖5-10 試體一測試圖〝括弧內為測點座標〞.................. 69
圖5-11 試體二測試圖〝括弧內為測點座標〞.................. 70
圖5-12 試體二測試圖〝括弧內為測點座標〞.................. 71
圖5-13 試體三測試圖〝括弧內為測點座標〞.................. 72
圖5-14 試體三測試圖〝括弧內為測點座標〞.................. 73
圖5-15 試體四測試圖〝括弧內為測點座標〞.................. 74
圖5-16 試體四測試圖〝括弧內為測點座標〞.................. 75
圖5-17 試體五測試圖〝括弧內為測點座標〞.................. 76
圖5-18 試體五測試圖〝括弧內為測點座標〞.................. 77
圖5-19 試體六測試圖〝括弧內為測點座標〞.................. 78
圖5-20 試體六測試圖〝括弧內為測點座標〞.................. 79
表 目 錄
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 頁次
表5-1 試體一各點之測試結果與厚度運算..................... 80
表5-2 試體二各點之測試結果與厚度運算..................... 81
表5-3 試體三各點之測試結果與厚度運算..................... 82
表5-4 試體四各點之測試結果與厚度運算..................... 83
表5-5 試體五各點之測試結果與厚度運算..................... 84
表5-6 試體六各點之測試結果與厚度運算..................... 85
表5-7 各試體各測點之內P波探頭數據與波速推測結果..........86
表5-8 抗壓圓柱試體與部分鑽心圓柱試體作頻率域
敲擊回音測試之相關數據與波速推測結果............... 87
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