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相關文獻
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頁籤選單縮合
題 名 | Inverse Determination of Surface-Breaking Cracks in Concrete Using Transient Elastic Waves Part Ⅰ: Numerical Forward Simulation=以暫態彈性波反算混凝土表面裂縫(1):數值正算模擬 |
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作 者 | 吳政忠; 方金壽; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 9:4 1997.12[民86.12] |
頁 次 | 頁627-636 |
分類號 | 440.327 |
關鍵詞 | 彈性波; 裂縫; 混凝土; 反算問題; Elastic wave; Crack; Concrete; Inverse problem; |
語 文 | 英文(English) |
中文摘要 | 本文的第一部份發展一套三維有限差分程式以研究混凝土表面裂縫之暫態繞射波的一些特性,包括垂直及傾斜裂縫。文中分析裂縫繞射波的波前訊號,以及其所隱含的相位特徵,但對於有限長度的非均勻裂縫,則仿照超音波B掃瞄的方式以暫態波影像作為初步的辨識。最後,本文提出了一個分辨表面裂縫是否垂直向下的簡易方式。在本文的第二部份將應用此差分程式偵測裂縫,引進反算方法,配合實驗訊號進行深度反算。 |
英文摘要 | A three dimensional heterogeneous finite difference FORTRAN program is developed for studying the characteristics of transient diffracted wave propagation in a concrete structure containing a surface-breaking crack. The diffracted waves due to both normal and oblique surface-breaking cracks are simulated. The characteristics of the diffracted longitudinal wave-front and the initial part of the diffracted waves are analyzed. In addition, diffracted waves due to a finite area crack are also presented. Finally, a simple testing method for differentiating a normal and an oblique surface-breaking cracks is proposed. The general purpose 3-D finite difference program is used in Part Ⅱ of this paper for the inverse determination of surface-breaking crack geometry using transient elastic waves. |
本系統中英文摘要資訊取自各篇刊載內容。