研究生: |
吳邦豪 Bang-hao Wu |
---|---|
論文名稱: |
橋梁耐洪可靠度之初步評估 Reliability-based Bridge Preliminary Evaluation against Floods |
指導教授: |
廖國偉
Guo-wei Liao |
口試委員: |
邱建國
Jian-guo Qiu 宋裕祺 Yu-qi Song |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2015 |
畢業學年度: | 103 |
語文別: | 中文 |
論文頁數: | 143 |
中文關鍵詞: | 貝氏網路 、可靠度分析 、粒子群優化演算法 |
外文關鍵詞: | Bayesian Network, Relibility Analysis, Particle Swarm Optimization. |
相關次數: | 點閱:287 下載:7 |
分享至: |
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橋梁結構物為連結兩地、維持交通機能的重要輸送線,受到環境天候因素、本身劣化、外力如地震、洪水沖刷等因素的影響,局部構件亦或整體橋梁結構物之損傷為無可避免之現象,且近年來氣候異常,使得乾旱、地震與暴雨等自然災害發生的頻率逐漸增加。橋梁的檢修作業極具必要與急迫性,但國內跨河橋梁的數量高達兩萬多座,逐一進行詳盡的結構能力檢核與補強作業需要耗費龐大的成本及資源。目前以橋梁耐洪能力的領域,專家的初步評估是目前最為主流的基本檢測模式,兼具低成本且快速的優點,然而評估項目的配分與判斷標準卻相當主觀,評分結果會受限於專家經驗與肉眼所見,而跨河橋梁的耐洪能力具有高度的不確定因素,單就初步的評估難以體現橋梁真正的問題癥結點。
本文所提出的初步評估表,除了參考專家之意見外,亦進行一系列的學理分析,對現有的橋梁初步評估表內的配分進行調整,以貝氏網路所得到的失效機率與評估表所得之沖刷潛勢作為調整依據,搭配最佳化方法-粒子群優化演算法來搜尋出各個評分項目的最佳配分,使評估表的結果不僅更具客觀性,還能使之具有通用性,讓未來國內跨河橋梁耐洪能力的相關評估作業能更有說服力,同時也能提供更精確的評估結果供決策者做判斷。
Bridge is the one of the most important structures in daily life. Bridge safety is affected by many factors such as environmental conditions, deteriorated situation, and external forces (e.g., floods). Bridge safety has drawn much attention due to the increasing rate of natural hazard. However, it is not possible to perform a detailed evaluaton for each bridge in Taiwan. To reduce the cost, a preliminary inspection evaluation form (PIEF) is often used in Taiwan. The advantage of using PIEF is one can obtain the bridge condition within a very short time frame. However, the PIEF is usually generated by experts’ opinions and therefore, is relatively subjective. Because the bridge safety evaluation involves many uncertainties, reliability analysis was incorporated with the existing PIEF to provide a more promising approach.
The goal of research is to adjust the weights of the PIEF by analyzing several bridges with pile foundation. The weights were optimized such that the PIEF grade will have a close correlation with its corresponding failure probability. A reliability-based PIEF is therefore proposed to predict the bridge preliminary condition more accurate to assist the decision makers.
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