劣化預力混凝土箱型梁之診斷分析

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姓名

葉曜銜(Yao-Hsien Yeh) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

劣化預力混凝土箱型梁之診斷分析
(Diagnostic Analysis of Deteriorated Prestressed Concrete Box Girder)

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至系統瀏覽論文 (2025-8-1以後開放)

摘要(中)

對大跨徑的橋梁而言，預應力系統為重要的受力部分，橋體的變位量往往與預應力的損失有關。而預應力的損失原因除了乾縮潛變、錨定端滑移等，裂縫的擴展也可能造成預應力的損失。裂縫的生成擴展方向及速度，源自許多因素。本研究透過相關數值模擬，以及預應力混凝土梁振型模態。利用監測數據之變位曲線，再與數值模擬進行比對，透過反算分析估算出劣化箱型梁之剩餘預力。用利用估算出之現有預力值及呆載重使用裂縫擴展模擬判斷現場結構裂縫劣化主要原因。

摘要(英)

For the long-span bridge, the prestressed system is an important part of the force, and the displacement of the bridge body is often related to the loss of prestress. In addition to shrinkage and creep, the cause of the loss of prestressing, the direction and speed of the formation and expansion of the slip crack at the anchor end are derived from many factors. In this study, the relevant numerical simulation and the vibration mode of the prestressed concrete beam are adopted. Then compare with the numerical simulation, through the inverse calculation analysis to decompose the prestressed of the extension box-girder. The crack propagation simulation is used to judge the cracks of the on-site structure by using the existing prestressed value and the dead load.

關鍵字(中)

★ 橋梁健康監測
★ 預力損失
★ 裂縫
★ 自然振動頻率
★ Abaqus
★ MIDAS

關鍵字(英)

★ bridge health monitoring
★ prestressed loss
★ crack
★ natural frequency
★ Abaqus
★ MIDAS

論文目次

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 v
圖目錄 vii
表目錄 xiv
一、緒論 1
1-1研究背景 1
1-2研究動機與目的 2
1-3論文架構 2
二、文獻回顧 3
2-1預力混凝土橋與預力損失 3
2-2破壞力學相關理論 6
2-2-1破壞力學基本理論 6
2-2-2擴展型有限元素法(XFEM) 8
2-3世界上預力混凝土箱型梁橋之劣化案例 10
2-3-1中央採鉸接設計之預力混凝土箱型梁橋 10
2-3-2中央採連續設計之預力混凝土箱型梁橋 12
三、 Abaqus數值模擬軟體功能驗證 17
3-1預力混凝土梁之預拱驗證 17
3-2混凝土梁之裂縫擴展 20
3-3預力混凝土梁之裂縫擴展 22
四、模型參數研究 26
4-1混凝土梁之例題驗證 26
4-2預力混凝土梁直線鋼腱之模擬 32
4-3預力混凝土梁拋物線鋼腱之模擬 40
4-4混凝土梁有無裂縫之模態頻率與振型 48
4-5混凝土梁直線預力鋼腱有無裂縫之模態頻率與振型 51
4-6混凝土梁拋物線預力鋼腱有無裂縫之模態頻率與振型 56
五、 MIDAS數值模擬分析預力結構行為 60
5-1預力結構數值分析流程及方法 60
5-2 MIDAS分析軟體之預力構件行為模擬驗證 61
5-3混凝土潛變、乾縮模型 64
5-4數值分析模型 68
5-5模型參數調整與驗證 77
5-6數值模擬分析結果與討論 93
六、箱型梁之開裂模擬 99
6-1直線型箱型梁 99
6-2變斷面與曲線型箱型梁 103
七、結論與建議 107
參考文獻 109
附錄A(監測系統配置與成果) 112
附錄B(非破壞檢測成果) 114
98年裂縫檢測紀錄 116
108年裂縫檢測紀錄 121

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指導教授

王仲宇(Chung-Yue Wang)

審核日期

2020-8-18

推文