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碩士論文公告區 |
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| 年度： | 91 | |
| 姓名： | 楊君範(Chun-Fan Yang) | |
| 論文題目(中)： | 混凝土結構敲擊反應波傳研究 | |
| 論文題目(英)： | Stress Wave Propagation in Impacted Concrete Structure Members | |
| 摘要(中)： | ||
| 台灣位處地震帶且屬於溫暖潮濕的海島型氣候，結構物受此種環境的影響，其使用上安全性能之評估具相當之重要性。公共工程的安全性與全民息息相關，其施工品質及使用年限需要做合理的評估以保障社會民眾的生命與財產。非破壞檢測評估為一種高效率又具不損壞結構體特性，且可重複施測之檢測技術。在混凝土非均質材料之應用上，最具成熟度之ㄧ的檢測方式為暫態彈性波檢測技術，經由敲擊結構物表面所獲得之物理量推估而得知其材料性質、幾何邊界以及內部瑕疵種類與位置。在不破壞結構物之情況下之檢測結果，可以提供做為施工品質之保證以及耐久性評估之參考。 本研究中針對混凝土結構元件受敲擊反應之波傳行為，收錄相關之理論解析解，並針對不同幾何邊界之結構元件以有限元素法建立數值模型，規劃實驗試體，就其數據結果進行分析比較。此一連貫性研究期能對初涉非破壞領域之人員，對結構元件內之波傳反應，提供相關研究之參考依據。欲進一步深入探討此類問題之人員，亦能由本文中獲得相關理論之線索，希望藉此能對相關工程檢測上有些許的貢獻。研究結果顯示，以有限元素法模擬混凝土敲擊反應，可有效模擬出其邊界訊號特徵，藉由這些特徵之參數研究，應可歸納出各類元件敲擊訊號之特性，提供實驗判讀之依循規則。 |
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| 摘要(英)： | ||
| Since Taiwan is located on seismic belt with typical subtropical maritime climate, the assessment of the safety of structures is a very important issue for structures erected in this country. The safety of the infrastructure is so vitally interrelated with the society that the quality of construction and the expected service life should be reasonably evaluated to ensure the life and property of the society. A nondestructive testing evaluation can be a highly-effective, nondestructive, and repeatable technique. Methods based on the propagation of transient elastic waves are highly mature measuring techniques as have been applied to the testing of non-homogeneous concrete material. With the physical quantities gained from impacting the surface of the structure, the nature of the material, the geometry, and the characteristics and locations of the inner flaws could be evaluated. Without destructing the structure, the testing result can offer valuable information to secure the construction quality and structural or material durability. This study first reviews related elasticity theories concerning the wave propagation and dynamic responses due to impacts on the concrete structural members, then demonstrates numerical models for various structural members with different geometric boundaries using the finite element method, finally carries out experiments on specimens and makes further analyses and comparisons with the numerical results. It is intended for this study serving as a reference to the wave propagation of structural members for novices in this nondestructive testing field. Moreover, the experienced researchers may also find it useful in providing some clues of related theories. The study shows that the characteristics of the boundary signals can be effectively revealed by the finite element simulation. Nevertheless, by parametric studies on properly selected physical quantities and generalization of characteristics of specific parameters, it can potentially provide engineers with useful rule of thumb. |
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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-0824103-051605 | |