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研究生:吳欣容
研究生(外文):Hsin-Jung Wu
論文名稱:含裂紋加勁阻尼鋼板受等幅循環載重之行為分析
論文名稱(外文):Analysis of the Behavior of Cracked Steel Plates for Adding Stiffness and Damping Subjected to Constant Amplitude Loads
指導教授:侯建元侯建元引用關係
指導教授(外文):Chien-Yuan Hou
口試委員:郭昌宏謝宏元
口試日期:2014-07-15
學位類別:碩士
校院名稱:國立暨南國際大學
系所名稱:土木工程學系
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:2014
畢業學年度:102
語文別:中文
論文頁數:54
中文關鍵詞:鋼結構疲勞裂紋有限元素加勁阻尼
外文關鍵詞:Steel structureFatigue cracksFinite elementAdded damping and stiffness
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鋼結構設計規範的柔性設計概念允許鋼構件受到因地震引起的反覆載重後產生大量塑性變形,從而產生消能減振的效果。然而實驗發現鋼構件產生大量塑性變形前,在梁柱接合處即已產生不具大量塑性變形的疲勞裂紋。由金屬疲勞的概念著手處理此問題須先瞭解鋼構件受反覆載重的行為。過去已有眾多研究藉由有限元素彈塑性分析計算其力與位移之迴圈,但這些分析多假設鋼構件不含裂紋。本文藉由二維懸臂梁及三維加勁阻尼鋼板的有限元素分析,在模型中引入疲勞裂紋計算其力-位移迴圈。分析此種問題的關鍵在於如何避免裂紋面穿透,其中二維梁以束制裂紋面節點,而三維加勁阻尼鋼板則在二裂紋面加置桿元素以避免裂紋面穿透。計算結果顯示有限元素分析可有效模擬含裂紋鋼構件的力-位移迴圈隨裂紋成長而衰減的趨勢,且元素尺寸與位移增幅的大小對分析所得之力-位移迴圈無顯著影響。
Structural steel design allows steel members subjected to cyclic loading caused by the earthquake generated a large number of plastic deformation. However, the experiment was found beam-column joints already generated a large amount of fatigue cracks before plastic deformation. To deal with metal fatigue problem, the steel members behavior of cyclic loading must be understood. Numerous studies in the past have been analyzed by elastic-plastic finite element calculation of its force and displacement of the loop, but these analyzes assume that steel components do not contain cracks. In this paper, by a two-dimensional cantilever beam and three-dimensional damping steel plate finite element analysis of the introduction of fatigue cracks in the model to calculate the force - displacement loop. The key of this problem is how to prevent the two crack surfaces crossed, and the two-dimensional beam controls crack surface nodes to achieve the goal, and three-dimensional damping steel plate crack surfaces add spar elements to avoid crack surfaces crossed. The finite element analysis result can effectively simulate the trend of force-displacement loops decay with crack growth, and the effect of the force - displacement loops to the size of the element size and the size of the divided displacement are no significant.
目錄
論文摘要 I
Abstract II
第一章 緒論 1
1.1研究動機 1
1.2論文內容 1
第二章 背景與文獻回顧 2
2.1鋼構件的疲勞 2
2.2 加勁阻尼鋼板 3
第三章 二維含裂紋懸臂梁分析 5
3.1二維梁的描述 5
3.2位移增幅對分析結果的影響 9
3.3裂紋面附近元素尺寸對分析結果的影響 14
3.4裂紋與反力衰減之討論 18
第四章 加勁阻尼鋼板分析 26
4.1三維加勁阻尼鋼板的描述 26
4.2試體的F-u迴圈圖 31
4.3位移增幅Δu對F-u迴圈的影響 35
4.4裂紋面附近元素尺寸對分析結果之影響 41
4.5桿元素勁度對分析結果之影響 45
4.6試體的消能面積與卸載勁度衰減 49
第五章 結論與建議 51
5.1結論 51
5.2建議 51
參考文獻 52

參考文獻
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