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頁籤選單縮合
題名 | Imaging of Concrete Defects Using Elastic Wave Tests=混凝土缺陷影像法 |
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作者 | 劉佩玲; 葉柏涼; 游志源; | 書刊名 | 國立臺灣大學工程學刊 |
卷期 | 91 2004.06[民93.06] |
頁次 | 頁41-50 |
專輯 | 應用力學專輯 |
分類號 | 440.327 |
關鍵詞 | 混凝土; 缺陷; 影像法; 裂縫; 彈性波; Concrete; Crack; Defect; Elastic waves; Imaging; |
語文 | 英文(English) |
中文摘要 | 彈性波法是用來評估混凝土品質的一種相當有效的非破壞檢測法。在彈性波試驗中,利用鋼珠或鐵槌敲擊混凝土表面,以產生應力波源,並以感測器測量混凝土表面反應。由於應力波在混凝土內部傳遞時,遇到缺陷會產生反射、折射或繞射行為,故傳回表面之訊號含有內部缺陷資訊。表面訊號經過適當處理後,便可顯現缺陷之位置或尺寸。本文介紹數種利用彈性波建構混凝土缺陷影像的技術,包括表面裂縫影像法、表面裂縫三維掃描法,以及時間域和頻率域的內部缺陷影像法。所建構的影像可用以決定表面裂縫的走向及深度、內部缺陷位置、鋼筋位置,及保護層厚度。文中並以數值算例、模型試驗及現場試驗驗證各種影像法之有效性。 |
英文摘要 | The elastic wave test is an effective method for the nondestructive evaluation of concrete structures. In the test, an impact is applied on the surface of the concrete structure, and the response of the concrete due to the impact is measured and recorded. Since the surface response contains information regarding the defect of concrete, the data can be processed to depict the location and size of the defect. This paper presents the principles of various techniques to construct the image of defects in concrete structures using the elastic wave test. The techniques introduced include the imaging of surface-opening cracks, the three dimensional scan of surface-opening cracks, and the imaging of internal defects using time domain or frequency domain signals. The images can be used to determine the location of a surface-opening crack, an internal defect, reinforcing steel bars, or the covering thickness. Numerical examples, model tests, and in-situ tests are presented to verify the effectiveness of these methods. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。