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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張國鎮(Kuo-Chun Chang) | |
| dc.contributor.author | Chen-An Tsai | en |
| dc.contributor.author | 蔡鎮安 | zh_TW |
| dc.date.accessioned | 2021-06-16T22:58:01Z | - |
| dc.date.available | 2012-08-15 | |
| dc.date.copyright | 2012-08-15 | |
| dc.date.issued | 2012 | |
| dc.date.submitted | 2012-08-08 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64720 | - |
| dc.description.abstract | 台灣地形破碎，跨河橋梁眾多，加上地處熱帶、亞熱帶氣候交界，受經常性颱風侵襲，降雨強度大，且本島地理山高谷深，河川坡陡流急，因此跨河橋梁基礎普遍存在沖刷問題。無論國內外，橋梁損傷主因之一皆指向基礎沖刷，而橋梁基礎埋置深度是影響橋梁結構穩定性之重要指標，是目前計算基礎安全性不可或缺的參數，故發展出一套可即時掌握橋梁基礎剩餘埋置深度之方法，進而可準確的推算橋梁安全係數，供相關橋梁權責管理單位進行災前應變乃為當務之急。
本研究提出以橋梁微振動訊號作為識別橋梁埋置深度之方法，首先透過靜力試驗簡化沖刷問題，得知埋置深度是掌控結構主要頻率之主控因子，且其關係可以二次曲線表示，並以有限元素模型驗證實驗趨勢，而後以短時傅立葉轉換作為即時結構頻率擷取工具，再以埋置深度與頻率之關係式將頻率轉換成埋置深度，結合環境因子資料收集，輔以碎形理論作為結構穩定性判別，最後以埋置深度計算安全係數，以碎形理論計算安全指標，判定橋梁安全性。 為證實本研究方法之可行性與精確性，於實驗室進行縮尺橋梁沖刷試驗，藉由縮尺橋墩內之攝影機紀錄即時沖刷深度，驗證以微振訊號推算出之剩餘埋置深度。經一系列試驗結果可證實此研究方法可有效預測埋置深度之變化，環境因子之監測有助於釐清因沖刷以外造成橋梁頻率變化之因素。此方法對橋梁結構健康診斷有相當助益，可在災害發生前提出預警，減少生命財產之損失。 | zh_TW |
| dc.description.abstract | Bridges are prone to suffer from multiple hazards such as earthquake, wind, or floods for the special structural characteristic. To guarantee the stability of bridge structure, how to precisely evaluate the scour depth of bridge foundation has become an important issue recently as most of the unexpected damage or collapse of bridges are caused by hydraulic issue. In this paper, a vibration-based bridge health monitoring system considering the response of superstructure only is proposed to rapidly evaluate the embedded depth of bridge pier. To clarify the complex fluid-solid coupling phenomenon, the effect of embedded depth and water level was first verified through a series of static experiment. A finite element model with confinement simulated by soil spring was then established to illustrate the relationship between the fundamental frequency and the embedded depth. With the proposed algorithm, the health condition of the bridge can be inferred by processing the ambient vibration response of the superstructure. To implement the proposed algorithm, a SHM prototype system monitoring the environmental factors such as temperature, water level, and inclination was developed to support on-line processing. The performance of the proposed system was verified by a series of dynamic bridge scour experiment conducted in laboratory flume and compared with the reading from water-proof camera. The result has shown that by using the proposed vibration-based bridge health monitoring system, the embedded depth of bridge pier during complex scour process can be reliably reflected. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T22:58:01Z (GMT). No. of bitstreams: 1 ntu-101-R99521205-1.pdf: 19235409 bytes, checksum: 33153eff4cbe9fecb4eb8845d7f28665 (MD5) Previous issue date: 2012 | en |
| dc.description.tableofcontents | 誌謝 IV
摘要 VI 英文摘要(Abstract) VIII 目錄 X 表目錄 XII 圖目錄 XIII 第一章 緒論 1 1.1研究背景 1 1.2研究動機與目的 1 1.3論文章節架構 3 第二章 文獻回顧 7 2.1結構健康診斷系統 7 2.2橋梁沖刷議題 9 2.4橋梁沖刷破壞機制 12 第三章 橋梁健康診斷邏輯先期研究 31 3.1試驗目的 31 3.2試驗規劃及步驟 31 3.3試驗結果與現象觀察 32 3.4有限元素模型建置與靜力試驗趨勢分析 33 3.4.1土壤彈簧數值模型 33 3.4.2砂土性質試驗 37 3.4.3有限元素模型建置 39 3.4.4趨勢驗證 40 3.5小結 42 第四章 橋梁健康診斷邏輯分析方法 61 4.1短時傅立葉轉換 61 4.2碎形理論 62 4.2.1 W-M碎形方程式 (Weieratrass-Mandelbrot Fractal Function) 62 4.2.2尺度常數、碎形維度、高度尺寸三者之關係 63 4.2.3以變異法計算碎形維度 65 4.2.4以能量頻譜法求高度尺寸與尺度常數 67 4.3埋置深度推算方法 68 4.4安全係數計算與安全因子判定邏輯 69 4.4.1 土壤承載力破壞 70 4.4.2 水流作用力傾倒破壞 72 4.4.3 不穩定傾倒破壞 75 4.5安全因子邏輯訂定與安全係數計算結果 76 第五章 縮尺橋墩沖刷試驗準備 93 5.1驗證方法模型製作 93 5.2監測硬體配置與軟體開發 94 5.2.1橋梁健康診斷雛型機組 94 5.2.2微振訊號量測 96 5.2.3環境因子監測 96 5.3軟體開發與監測介面 98 第六章 實驗驗證 115 6.1前言 115 6.2單墩沖刷試驗 116 6.2.1單墩沖刷試驗─0305 117 6.2.2單墩沖刷試驗─0416 119 6.2.3單墩沖刷試驗─0508 120 6.3 全橋沖刷試驗先期研究 122 第七章 結論與建議 153 7.1 結論 153 7.2 建議 154 參考文獻 157 附錄一 縮尺橋墩沖刷試驗建置 163 | |
| dc.language.iso | zh-TW | |
| dc.subject | 橋梁沖刷 | zh_TW |
| dc.subject | 結構健康診斷 | zh_TW |
| dc.subject | 短時傅立葉轉換 | zh_TW |
| dc.subject | 碎形理論 | zh_TW |
| dc.subject | 結構穩定性 | zh_TW |
| dc.subject | Fractal theory | en |
| dc.subject | Bridge scour | en |
| dc.subject | Structure health monitoring | en |
| dc.subject | Structure stability | en |
| dc.subject | Short-time Fourier Transform | en |
| dc.title | 以結構振動訊號診斷橋梁受沖刷之安全性研究 | zh_TW |
| dc.title | Implementation of a Vibration-Based Bridge Health Monitoring System on Scour Issue | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 羅俊雄(Chin-hsiung Loh),宋裕祺(Yu-Chi Sung) | |
| dc.subject.keyword | 橋梁沖刷,結構健康診斷,短時傅立葉轉換,碎形理論,結構穩定性, | zh_TW |
| dc.subject.keyword | Bridge scour,Structure health monitoring,Short-time Fourier Transform,Fractal theory,Structure stability, | en |
| dc.relation.page | 171 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2012-08-09 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 土木工程學研究所 | zh_TW |
| 顯示於系所單位： | 土木工程學系 | |
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