臺灣博碩士論文加值系統

斜張鋼纜乃是斜張橋與脊背橋整體結構系統中傳遞力量之主要構件，因此不論是施工階段的索力施拉或是通車後的橋體健康監測，鋼纜索力之正確估算都扮演最關鍵性的角色。只是索力的改變亦與鋼纜溫度的變化息息相關，所以斜張鋼纜溫度場變化受環境溫度影響之相關分析其實極為重要，但以往的研究卻很少對這個課題有所著墨。有鑑於此，本研究首先利用布拉格光纖光柵感測器開發出一套適合應用於長期量測斜張鋼纜內部溫度的系統，接著製作內注不同灌漿材的鋼纜試件進行長期溫度量測，最後更根據這些資料深入探討斜張鋼纜內部溫度場變化與周圍空氣溫度以及不同灌漿材的關係。經由實測結果交叉分析顯示：(1) 斜張鋼纜之單日最高溫大於當日最高氣溫，單日最低溫小於當日最高氣溫，且發生時間通常晚氣溫0至3小時；(2) 無灌漿與灌發泡劑鋼纜的單日最高溫較高且彼此接近，而灌水泥漿鋼纜則相對較低，同時前兩者較後者之發生時間較早；(3) 三種不同灌漿鋼纜的單日最低溫差異有限且發生時間亦相當一致；(4) 鋼纜的內部熱流方向基本上皆由套管上方傳遞至下方，其原因應來自日照方向的影響。

Cables are the most critical force-transmitting members of cable-supported bridges. An accurate determination of cable force accordingly plays an important role in the structural health monitoring of suspension or cable-stayed bridges. The alternation of cable force, however, also strongly relates with the change of cable temperature. Therefore, the analysis for the temperature field to be effected by the variation of environmental temperature is actually a crucial topic to investigate, but seldom explored in the literature. This research is first aimed to develop a reliable thermometer using fiber Bragg grating sensor for applying in the long-term measurement of the temperature inside a stay cable. Three cable samples filled with different grouting materials are then produced to conduct long-term temperature measurements. The collected data are finally analyzed to examine how the internal temperature field of a stay cable would be related to the environmental air temperature and different grounting materials. Based on the analysis with these real measurements, it shows that: (1) the highest daily temperature of stay cable is higher than the corresponding highest daily temperature of air and usually with a time lag of 0 to 3 hours; (2) the highest daily temperature for the sample without grouting and that for the one grouted with foaming agent hold higher values and occur earlier, compared with that for the one grouted with cement; (3) the lowest daily temperatures for the three differently grouted samples are close and occur at similar time instants; (4) the heat flow inside the stay cable is essentially from the top of tube to its bottom, which be induced by the direction of sunshine.

目錄
摘要 i
ABSTRACT ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章 緒論 1
1-1 研究動機與目的 2
1-2 本文內容與架構 4
第二章 光纖傳輸原理及其在感測之應用 5
2-1 光纖構造與傳輸原理 5
2-1-1 光纖構造 5
2-1-2 全反射之概念 5
2-1-3 光纖的傳輸損失 6
2-1-4 光纖之優點 6
2-2 光纖感測器之簡介 8
2-3 布拉格光纖光柵感測器 9
2-3-1 布拉格條件 10
2-3-2 波長飄移與應變和溫度的關係 11
第三章 光纖光柵溫度計製作與測試 16
3-1 量測設備 16
3-1-1 光纖光柵感測器與試驗量測設備 16
3-1-2 光纖光柵溫度計製作 18
3-2 光纖光柵溫度計測試 19
3-3 光纖光柵感測器成品製作 21
第四章 鋼纜試件製作與安裝 45
4-1 試驗規劃與使用材料及設備 45
4-2 試件製作步驟 46
4-3 試件安裝與量測儀器架設 48
第五章 鋼纜試件溫度量測分析 59
5-1 量測資料說明 59
5-2 量測資料分析 59
5-2-1 部分量測之異常與問題說明 60
5-2-2 各項統計分析 62
5-3 量測結果與討論 67
第六章 結論與建議 95
參考文獻 97

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