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研究生:徐承佑
研究生(外文):Cheng-Yu Hsu
論文名稱:銲接接頭受偏心載重之強度分析-極限強度分析法
論文名稱(外文):Strength Evaluation of Welded Connections under Eccentric Loads by Ultimate Analysis
指導教授:呂東苗
口試委員:徐耀賜徐暐亭
口試日期:2016-07-11
學位類別:碩士
校院名稱:國立中興大學
系所名稱:土木工程學系所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2016
畢業學年度:104
語文別:英文
論文頁數:79
中文關鍵詞:銲接接頭偏心載重極限強度分析法
外文關鍵詞:welded connectioneccentric loadultimate strength analysis
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鋼骨結構之梁柱銲接接頭常會承受偏心載重,因此銲接接頭之銲道會受到偏心彎矩與剪力之同時作用。目前AISC設計規範對於銲接接合受彎矩及剪力聯合作用下之分析與設計,僅提供設計手冊之查表方法,說明其所列圖表值是根據相當沉長複雜之極限強度分析方法,惟必要時也可以採用保守之彈性分析方法。設計手冊沒有說明當其所列圖表不敷使用或銲道幾何形狀與設計手冊所提供之銲道幾何形狀不同時,使用者該如何處理;沒有實例說明如何使用極限強度分析取得其設計手冊圖表數值;沒有提供當斜角偏心載重超過75度時之設計手冊圖表數值。
本研究針對使用者可能面臨之上述問題,提出一套較為完整解決方法包括:1.參考過去有關本主題之相關研究,分別根據彈性分析與極限分析原理推導銲接接合受彎矩及剪力聯合作用之相關理論,整理提出一套比較完整之分析公式,佐以例題方式說明設計手冊銲接圖表數值取得之演算過程,提供使用者分析上之實質幫助;2.由於當斜角偏心載重超過75度時之標稱強度計算涉及沉長複雜公式,所以理論公式對工程界沒有實質意義,為了滿足工程界的分析與設計需要(θ > 75°),必須建立一個模型以估算當斜角偏心載重超過75度時之標稱強度,以取代複雜之公式運算。
本研究之成果將補充目前規範之不足,使AISC設計手冊更符合使用者需要,讓使用者從此對銲接接合之分析與設計較有依據,進而提昇結構物銲接接合之設計品質。

A welded connection is often subjected to both bending moments and shears due to an eccentric load. The current AISC design specifications provide only the design tables/charts for design purpose. The specifications indicate that the table/chart values are obtained based on the ultimate strength which is very complex and tedious to apply. However, the specifications allow designers to analyze the welded connection by using the elastic analysis which is very conservative. The specifications do not give an alternate to analyze the connection if the eccentric load angle exceeds 75 degrees. There is no any illustrated example provided to guide the designers how to obtain the table values.
This study aims to provide a set of reasonable solution to overcome the problems mentioned above. The first one, the methods based on elastic and ultimate strength analysis with detailed steps are present. The second one, a model is expected to solve the case which the eccentric load angle exceeds 75 degrees. This is because of the long and tedious procedure is not a common practice for a designer.
This study provides the deficiency of the current Specifications. This will also provide a better solution for practicing engineer in their routine design.

Abstract in Chinese i
Abstract in English ii
Table of Contents iii
Figures List iv
Tables List vi
Chapter 1 Introduction 1
1.1 Background 1
1.2 Objectives 2
Chapter 2 Analysis Methods for Welded Connections 3
2.1 Elastic method 3
2.2-1 Instantaneous center of rotation method (2005 AISC) 5
2.2-2 Instantaneous center of rotation method (2010 AISC) 7
2.3 Design tables for eccentrically loaded weld groups 10
2.4 Design tables for concentrically loaded weld groups elements 11
Chapter 3 Illustrated Examples 13
3.1 C-shaped fillet weld with eccentric load which is at right-hand side 13
3.2 C-shaped fillet weld with eccentric load which is at left-hand side 28
3.3 Fillet weld with concentric load 43
3.4 One vertical fillet weld with concentric load 50
Chapter 4 Illustrated Examples 57
4.1 C-shaped fillet weld with eccentric load at right-hand side (75° ≤ θ ≤ 90°) 57
4.2 C-shaped fillet weld with eccentric load at left-hand side (75° ≤ θ ≤ 90°) 61
4.3 Box-shaped fillet weld with eccentric load (75° ≤ θ ≤ 90°) 65
4.4 Box-shaped fillet weld with eccentric load (75° ≤ θ ≤ 90°) 69
4.5 Two vertical fillet welds with eccentric load (75° ≤ θ ≤ 90°) 73
Chapter 5 Conclusions 77
References 79

1. American Institute of Steel Construction, Inc., (2005), Manual of Steel Construction, Allowable Steel Design, Thirteenth Edition, AISC, Chicago, IL.
2. American Institute of Steel Construction, Inc., (2010), Manual of Steel Construction, Allowable Steel Design, Fourteenth Edition, AISC, Chicago, IL.
3. Blodgett, O.W., (1966), Design of Welded Structures, James F. Lincoln Arc Welding Foundation, Cleveland, OH.
4. Butler, L.J., Pal, S. and Kulak, G.L., (1972), “Eccentrically Loaded Welded Connections,” Studies in Structural Division, Vol. 98, No. ST5, (May), pp. 989-1005, ASCE, Reston, VA.
5. Crawford, S.F and Kulak, G.L., (1968), “Behavior of Eccentrically Loaded Bolted Connections,” Studies in Structure Engineering, (No. 4), Department of Civil Engineering, Nova Scotia Technical College, Halifax, Nova Scotia.
6. Higgins, T.R., (1971), “Treatment of Eccentrically Loaded Connections in the AISC Manual,” Engineering Journal, Vol. 8, No. 2, (April), pp. 52-54, AISC, Chicago, IL.
7. Lesik, D.F. and Kennedy, D.J.L., (1990), “Ultimate Strength of Fillet-Welded Connections Loaded in Plane”, Canadian Journal of Civil Engineering, Vol. 17, No. 1, National Research Council of Canada, Ottawa, Canada.

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