回首頁回首頁聯絡我們網站導覽English version
中文標題: 樁基礎縮尺橋梁模型之沖刷易損性曲線建置試驗研究
英文標題: Experimental Study on Developing Scour Fragility Curves -A Case Study of Bridge Pile Foundation
編號: NCREE-13-008
語言: 中文
編輯:
媒體型式: 紙本
作者:
沈明毅   張國鎮   陳俊仲   
中文摘要: 台灣受板塊擠壓之緣故,中央山脈橫亙於台灣本島中央,有著山高水急的地形特色,於雨季時,龐大的降雨使得河川水位上升並快速流入海中,因有這樣的地形與氣候環境,台灣的跨河橋梁普遍存在沖刷之現象,於颱風過境時橋梁倒塌時有所聞。考量現行橋梁設計規範對受沖刷橋梁的不足,以可靠度分析方法修正之,其中易損性曲線為不可或缺之一環,建立沖刷之易損性曲線有其必要性,本研究將針對此議題進行探討。
本研究首先針對橋梁沖刷議題做資料收集及研究,了解其破壞模式與橋梁可靠度分析等相關問題後,設計一系列之試驗,整理並歸納試驗之結果,提出一建置沖刷易損性曲線之方法。橋梁沖刷是一複雜之流體、土壤、結構互制行為,本研究針對土壤承載力破壞進行試驗探討橋梁結構行為,以及不同流況下橋梁沖刷之發展情形,並觀察橋梁受沖刷之破壞機制。再以兩項實驗結果建立橋梁沖刷易損性曲線方法,首先為樁基礎橋墩靜力承載試驗,以受不同沖刷深度之樁基礎側推曲線,歸納實驗結果推論容量損失與沖刷深度之關係,以及縮尺橋梁模型水槽實驗,收集橋梁受沖刷之各項參數,定義橋梁受沖刷之損壞指標,找出各損壞指標所對應之沖刷指標,並控制環境因子,如流速、水位與載重配置等,其中實驗之不確定性來自於土壤參數,重複多次實驗建立數據資料庫,以最大似然性法推得沖刷指標之分布函數。最後結合兩個實驗之結果,修正沖刷指標,並建立沖刷之易損性曲線。本研究建置沖刷易損性曲線之方法後,可供未來於可靠度分析與設計上參考,考慮特定流域下,結合沖刷危害度曲線,推估橋梁因洪災所損壞之機率。
英文摘要: ABSTRACT The escalating scale of natural disasters associated with global climate change and the growing world population increasingly threatens civil infrastructure. In particular, floods accelerate process of local scouraround bridge piers resulting in damage to or failure of cross-water bridge structures. This study proposed a procedure for constructing scour fragility curves from flume experimental data for piled bridge pier. By a series of single-pile bridge pushover tests, the relationship between scour depth and capacity loss can bederived from the results. In addition, several flume experiments with a pier model scouring under controlled conditions were conducted and the scour process variation was observed. The scour depth observed from flume experiments were used to develop scour fragility curve which could be applied to evaluate the scour vulnerabilities of piled bridge pier for preliminary studies. A methodology to construct the scour fragility curve from flume experimental data was presented in this study; the main purpose of this paper is to show how the experimental data were used to build the scour fragility curves which are defined as a function of scour depth ratio or capacity loss ratio. The measured trend of the curves consists with the general scour process and the realistic behavior of piled bridge pier damage sequence. This paper has shown a feasible and practical methodology to construct the scour fragility curves from experiments.
關鍵字: 橋梁沖刷、易損性曲線、最大似然性法
目錄:
  下載  (240 KB)
全文:
  登入後下載  (14 MB)

[前頁] [頁首]

若您有任何關於網站內容的問題與建議,請聯絡網頁管理員,感謝。
Tel:(02)6630-0888 Fax:(02)6630-0858 Add:(106)台北市辛亥路三段200號
版權所有 2010 國家地震工程研究中心