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研究生:林東遠
研究生(外文):Dung-Yuan Lin
論文名稱:多層桁架之系統穩定特性
論文名稱(外文):Buckling and Postbuckling of multistory trusses in the system level
指導教授:呂秋水
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:河海工程學系
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:100
中文關鍵詞:挫屈後挫屈多層桁架系統整體挫屈局部挫屈
外文關鍵詞:BucklingPostbucklingmultistory trusseslocal bucklingglobe buckling
相關次數:
  • 被引用被引用:3
  • 點閱點閱:121
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
在大跨徑或是細長型的結構物分析裡,經常會有挫屈的行為發生。本文分析挫屈問題採用非線性分析法,比起傳統的線性方法,非線性方法的準確度與適用性會大幅提升。本文使用數值法-牛頓迭代法,分析多層桁架系統的主路徑並求出挫屈載重與挫屈模態,模擬挫屈時結構物的側移行為。而後挫屈行為的探討更是本文重點之ㄧ,本文利用攝動法的理論求得多層桁架系統後挫屈的次路徑並判斷挫屈後的穩定行為。除此之外,鋼結構規範(LRFD)所考慮的局部挫屈與本文探討之整體挫屈,在細長型結構分析上往往後者為控制因子,所以符合規範設計是不夠周詳的,本文所得結果可應用於多層桁架系統之分析與設計。
Truss systems are widely used in civil, ocean and aerospace engineering. Most specifications concerning design of such structures mainly focus on preventing from buckling of individual members. This consideration has proven adequate for truss structures under transverse loading, whereas a truss tower subjected to axial compressive force may exhibit overall buckling without inducing local instabilities. Buckling and Postbuckling of tower trusses is the major concern of this study. Analysis is based on geometrically nonlinear finite element method together with perturbation technique. Single- and two-span multistory truss towers are investigated. Both stable-and unstable-postbuckling are found.
誌謝
摘要
第一章 緒論
1.1 前言........................................1
1.2 文獻回顧....................................2
1.3 研究內容....................................4
第二章 桁架系統特性
2.1 前言........................................6
2.2 構件型式....................................6
2.3 連接型式....................................9
2.4 工程實例...................................11
第三章 挫屈、後挫屈相關理論
3.1 前言.......................................15
3.2 平衡方程式與挫屈載重的判定..................15
3.2.1 有限元素法分析下之形狀函數..........15
3.2.2 非線性勁度矩陣推導..................17
3.2.3 非線性挫屈載重......................19
3.3 次路徑特性..................................21
3.4 後挫屈攝動分析..............................21
第四章 實例分析
4.1 前言........................................24
4.2 單跨系統挫屈與後挫屈行為.....................24
4.2.1 單跨挫屈模態...........................24
4.2.2 後挫屈分析.............................30
4.3 雙跨系統後挫屈行為...........................39
第五章 鋼結構設計規範之引用
5.1前言..........................................55
5.2 LRFD設計規範................................55
5.3 實例設計.....................................57
5.4 局部挫屈與整體挫屈探討.......................64
第六章 結論
6.1 結論與建議..................................76
附錄....................................................78
參考文獻...............................................85
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