研究生: |
蘇嘉瑋 Chia-Wei Sue |
---|---|
論文名稱: |
台北盆地衝鑽式地錨破壞機率研究 Calibration of Reliability-based Resistance Factors for Soil Anchors in Taipei Basin |
指導教授: |
卿建業
Jianye Ching |
口試委員: |
廖洪鈞
Hung-Jiun Liao 劉家男 LIU, Chia-Nan |
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: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 143 |
中文關鍵詞: | 地錨 、拉拔力 、可靠度 、安全係數 |
外文關鍵詞: | alluvial soils, pullout test, reliability-based design, resistance factor |
相關次數: | 點閱:183 下載:5 |
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在台北盆地,多數地錨的施工都是先以旋轉套管鑽孔,再以水將殘餘土以高壓沖出。這樣的施工過程常使實際的鑽孔直徑比套管直徑大,且鑽孔壁常呈現不規則的形狀。這兩項因素都有利於提升地錨拉拔力,然而提升程度有多少常常是不確定的。為了求保守,一般計算設計拉拔力時都不考慮這兩項因素。在這樣保守的計算下,大部分規範(如FIP 1982)仍採用相當高的安全係數(安全係數 = 3),驗證此安全係數是否過於保守,是本研究的主要議題。本研究根據台北盆地的46根地錨現地實驗資料,經過嚴謹的全機率分析,得到以下的結論:安全係數=3所對應的設計破壞機率小於10-4;若設計的地錨為暫時性結構,這樣的設計破壞機率過於保守。若採用設計破壞機率10-2,所需要的安全係數約在0.9到1.8之間;若採用設計破壞機率10-3,所需要的安全係數約在1到2.4之間。這比規範所採用的安全係數小了許多。
The goal of this research is to calibrate the reliability-based resistance factor of flush drilled soil anchors for their ultimate pullout capacities based on in-situ anchor pullout test data in the alluvial soil underlying the Taipei basin. Efforts are taken to quantify the uncertainties with a full probabilistic analysis approach. The resistance factor is calibrated based on the in-situ test results of 46 anchors with a rigorous theoretical approach which constructs the relationship between the resistance factor and failure probability. With this relationship, the reliability corresponding to the code regulation can be verified. From the results of the analysis, it is found that the borehole enlargement due to the flush drilling is quite significant: the actual diameter of the fixed anchor end may be much larger than the nominal diameter of the drilling casing. Consequently, the safety factor of three recommended by most anchor codes is found to be too conservative. The results should be valuable for reliability-based design of flush drilled soil anchors in the Taipei basin.
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