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姓名 顏瑞興(Rui-Xing Yan) 查詢紙本館藏 畢業系所 土木工程學系 論文名稱 多重隨機遞減法於現地橋梁微振量測之應用
(Application of Multiple Random Decrement Method in Existing Bridge Ambient Vibration Measurement)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 許多土木結構健康監測與系統識別的研究利用微振量測來進行,不過因為缺乏輸入訊號而只能得到結構的輸出反應,所以必須開發只需利用輸出訊號的特殊系統識別技巧,即現地量測模態分析。然而微振量測所能得到的結構輸出訊號並非自由振動反應,因此目的在從系統隨機振動反應取得自由衰減反應的隨機遞減法。近年針對鋼纜之振態參數識別,提出一個稱為多重隨機遞減法的改良技巧,就是將隨機遞減法一次次重複應用,使集中的外力完全濾除,後續利用快速傅立葉轉換(Fast Fourier Transform)來分析出自然振動頻率、模態振型及模態阻尼比,近年來微振現地量測模態分析多用於房屋結構上,因次本文將套用於現地橋梁(碧潭人行吊橋、新長虹大橋、太魯閣大橋及新豐平大橋)上做使用,實行現地量測前,也會利用簡支梁來進行隨機遞減法及快速傅立葉轉換之分析。 摘要(英) Many studies on health monitoring and system identification of civil structures use ambient vibration measurement. However, due to the lack of input signal, only the output response of the structure can be obtained. It is necessary to develop special system identification techniques that only use the output signal. That is ambient vibration measurement model analysis. The structural output signal obtained by the ambient vibration measurement is not the free vibration response, so the purpose is obtain the random decrease method of the free decay response from the random vibration response of the system. In recent years, an improved technique called the multiple random decreasing method is proposed for the identification of the vibration parameters of the cable. It is to repeat the application of the random decreasing method again and again, so thoroughly filter out concentrated external forces. Subsequent use of Fast Fourier Transform to analyze the natural frequency, mode shape and damping ratio. In recent years, the modal analysis of ambient vibration measurement is used in building structures. Therefore, this article will be applied to the existing bridges. Before performing the on-site measurement, the simply supported beam will also be used for the analysis of the random decreasing method and the Fast Fourier Transform. 關鍵字(中) ★ 隨機遞減法
★ 多重隨機遞減法
★ 微振量測
★ 現地橋梁關鍵字(英) 論文目次 摘要 i
Application of Multiple Random Decrement Method in Existing Bridge Ambient Vibration Measurement ii
致謝 iv
目錄 v
表目錄 vii
圖目錄 viii
符號說明 xviii
第一章 緒論 1
1-1研究目的與動機 1
1-2本文內容與架構 2
第二章 文獻回顧 3
第三章 數據分析理論 6
3-1傳統隨機遞減法 6
3-1-1傳統隨機遞減法 6
3-1-2影響N值參數 8
3-2多重隨機遞減法 10
第四章 簡支梁實驗數據分析 12
4-1實驗步驟規劃 12
4-2數據分析 16
4-2-1實驗一 16
4-2-2實驗二 19
第五章 現地量測數據分析 22
5-1碧潭吊橋 22
5-1-1實驗步驟規劃 22
5-1-2 實驗一 24
5-1-3 實驗二 30
5-1-4 實驗三 36
5-1-5 實驗四 42
5-1-6 實驗五 48
5-2 新長虹橋 52
5-2-1 實驗步驟規劃 52
5-2-2 實驗一 53
5-2-3 實驗二 62
5-2-4 實驗三 70
5-3太魯閣大橋 79
5-3-1實驗步驟及規劃 79
5-3-2實驗一 80
5-3-2實驗二 89
5-3-3實驗三 97
5-3-4實驗四 106
5-3-5實驗五 114
第六章 結論與建議 124
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