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碩士論文公告區 |
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| 年度： | 93 | |
| 姓名： | 陳佑家(Yo-Gea Chen) | |
| 論文題目(中)： | 以敲擊回音法之轉換函數檢測混凝土內部瑕疵修補狀況之初步研究 | |
| 論文題目(英)： | Using the impact-echo transfer function to evaluate internal defects in concrete repairing | |
| 摘要(中)： | ||
| 本研究為以敲擊回音法之轉換函數檢測混凝土內部瑕疵修補狀況之初步研究，探討混凝土版狀結構之層隙與不同深度之轉換函數反應，版狀結構例如橋樑的底層舖面和支撐構架的牆面，在鋼筋層面通常會發生裂縫，在進行修補工作時，首先必須計算出混凝土結構物其內部的裂縫位置範圍。並且於修補完成後，計算層隙完全填滿環氧樹脂厚度之振幅值，以檢測混凝土內部瑕疵修補狀況。 研究中實驗結果將試體裂縫各個敲擊位置振幅值加以圖像化表示。發展這種非破壞檢測的方法，對於不適合鑽心的核能電廠、水庫壩堤、預力樑以及堤防工程的評估有一定的價值。本研究是由下列兩方向加以討論： (一) 探討數值模擬版之不同橫向裂縫長度與深度比值與轉換振幅值之關係。 (二) 實際檢測版內存在不同長度與深度比值之橫向裂縫時，於不同檢測點位之振幅值變化。 數值模擬推導出橫向裂縫W/H比值與轉換振幅值之關係，發現橫向裂縫尺寸越大，其振幅值越接近版的振幅值。實驗與數值模擬之結果振幅強度，層隙完全填滿環氧樹脂的振幅值均約為原本未填滿空隙的振幅值一半，呈現極高之相關性。頻譜圖顯示結果深度10cm裂縫和深度10cm層隙部分填滿環氧樹脂1cm的情況相似。實驗結果顯示，各試體不同敲擊位置之圖像化結果，可得到不同層隙尺寸時撓曲振動頻率及裂縫振幅的特徵。將實驗結果代入先前發展之版厚振幅值與版厚關係式，可得到版厚5公分尖峰振幅為2.3779。實驗所得之版厚尖峰振幅2.3697，所得之尖峰振幅誤差為0.34％ |
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| 摘要(英)： | ||
| This dissertation is a study to evaluate internal defects condition in repair of concrete using the impact-echo transfer function. Explore the transfer response of differ depth delaminations in the plate-like structures .In plate-like structures sush as bridge decks, slabs and infill walls in frames, cracking often occurs in the form of delaminations in the plane of the reinforcing bars. Thus in repair and rehabilitation of concrete structures is to determine the extent of cracking at first and after finishing the repair work, to determine the amplitude of delaminations full filled epoxy and evaluate internal defects condition of concrete. The different diameters of cracks may lead to different spectral amplitude corresponding to concrete layer. The experimental show results by the images of the different positions of the impact relative to the plane of the delamination. Thus it is possible to non-destructively evaluate the nuclear power station, reservoir dike or, prestressing force beam which is unfit for coring. The purpose of this study is as following. 1. Using numerical simulation to study the relationship between ratio of different horizontal crack’s length and depth and the spectral amplitude in transfer function. 2. Explore the amplitude of the different length delaminations in the plate-like structures. Using numerical simulation to obtain the relationship between ratio of horizontal delaminations’ W/H and the spectral amplitude in transfer function.Can project the size of horizontal delaminations is more large and it’s amplitude is more to approach the plate’s amplitude. The spectral amplitude of experimental results and numerical results show, the spectral amplitudes values of delaminations full filled epoxy is about half of the the spectral amplitudes values of delaminations unfull filled epoxy. The correlation is high. In waveform analysing,evaluate the 10cm depth of delaminations part filled epoxy 1cm.The spectral frequecy show, the condition of the 10cm depth of delaminations and the 10cm depth of delaminations part filled epoxy 1cm are similar. Experimental results show, the images of the different positions of the impact relative to the specimen, approach to the numerical simulation amplitudes. Take the experimental parameters into the previously developed equation for relating peak-amplitude to the thickness of a pure concrete plate without substrate layer. The predicted amplitude for the 5 cm-thick plate is 2.3779, which has 0.34% error to the average experimental amplitude, 2.3697 |
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| 檔案： | 沒有相關檔案 | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0816105-111051 | |