矩形鋼管混凝土考慮局部挫屈與二次彎矩效應之軸壓-彎矩互制曲線研究

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姓名

黃俊豪(Jun-hao Huang) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

矩形鋼管混凝土考慮局部挫屈與二次彎矩效應之軸壓-彎矩互制曲線研究

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摘要(中)

本研究採用非線性纖維元素法(Nonlinear fiber element method)建立考慮局部挫屈與二次彎矩效應之鋼管混凝土柱(Concrete-filled steel tube, CFT)的P-M互制曲線。多組方形CFT柱之最大軸壓強度與軸壓-單軸彎矩強度試驗數據用來驗證，纖維元素法分析結果的合理性。結果發現纖維元素法在分析CFT柱所計算的最大軸壓強度與彎矩強度，和試驗結果差異約略在合理範圍以內。另外，本研究亦藉由方形與矩形CFT柱軸壓-彎矩互制曲線進行參數研究，探討鋼管寬厚比、混凝土強度、鋼材降伏強度、偏心角、有效長度、初始幾何缺陷和偏心距等參數，對CFT柱軸壓-彎矩強度互制曲線的影響。

摘要(英)

This study presents nonlinear fiber element method determine the axial load-biaxial bending moment interaction curves of concrete filled steel tubular beam-columns (CFT) with local buckling and second-order effect. Many experimental ultimate loads and axial load-uniaxial bending moment stengths of square CFST slender beam-columns tested by independent researchers are used to verify the rationality of the fiber element method analysis. The predicted results of fiber element analysis method show good agreement with the uniaxial bending and ultimate load tests. In the study, an extensive parametric study was performed to investigate the influences of width-to-thickness ratio, concrete compressive strengths, steel yield strengths, load angle, columns slenderness, initial geometric imperfect, loading eccentricity on the axial load-biaxial bending moment interaction curve of concrete-filled steel tubular beam-column.

關鍵字(中)

★ 鋼管混凝土柱
★ 軸壓-彎矩互制曲線
★ 纖維元素法
★ 二次彎矩效應
★ 局部挫屈

關鍵字(英)

★ Concrete-filled steel tubular beam-column
★ Axial load -biaxial bending moment interaction curve
★ Fiber element method
★ Second-order effect
★ Local buckling

論文目次

摘要 I
Abstract II
目錄 III
表目錄 VII
圖目錄 XIV
第一章緒論 1
1.1 研究背景與動機 1
1.2 文獻回顧 3
1.3 研究內容 9
第二章以纖維元素法建立考慮局部挫屈之矩形CFT梁柱構件的互制曲線
10
2.1 纖維元素法之基本假設 10
2.2 建立纖維元素法之應變應力與斷面軸力和兩向彎矩 10
2.2.1 斷面離散 10
2.2.2 纖維元素應變計算 11
2.2.3 纖維元素應力計算 12
2.2.4 斷面軸力與兩向彎矩計算 14
2.3 鋼管局部挫屈與局部挫屈後之行為回顧 15
2.4 纖維元素法中模擬局部挫屈與局部挫屈後行為之方法 17
2.4.1 引言 17
2.4.2 臨界局部挫屈應力公式 18
2.4.3 有效寬度公式 21
2.4.4 應力調整 22
2.4.5 局部挫屈之模擬步驟 26
2.5 考慮局部挫屈之梁柱最大軸壓強度Pmax 27
2.6 纖維元素法之軸壓-雙軸彎矩互制圖形的建立 29
2.7 纖維元素個數訂定 31
第三章考慮局部挫屈之計算強度與試驗強度比較和P-M曲線參數研究 46
3.1 引言 46
3.2 纖維元素法計算強度與試驗強度比較 46
3.2.1 計算最大軸壓強度與試驗最大軸壓強度比較 46
3.2.2 計算純彎矩強度與試驗純彎矩強度比較 47
3.2.3 計算軸壓-單軸彎矩強度與試驗軸壓-單軸彎矩強度比較 48
3.3 考慮與不考慮局部挫屈之軸壓-彎矩互制曲線比較 54
3.3.1 受軸壓-單軸彎矩作用 54
3.3.2 受軸壓-雙軸彎矩作用 54
3.4 方形與矩形CFT柱軸壓-彎矩互制曲線參數研究 55
3.4.1 鋼管斷面寬厚比對軸壓-彎矩互制曲線的影響 55
3.4.2 混凝土強度對軸壓-彎矩互制曲線的影響 58
3.4.3 鋼材降伏強度對軸壓-彎矩互制曲線的影響 61
3.4.4 偏心角對軸壓-彎矩互制曲線的影響 63
第四章以纖維元素法建立考慮局部挫屈與二次彎矩效應之矩形CFT梁柱構件的互制曲線 103
4.1 引言 103
4.2 基本假設 103
4.3 考慮初始幾何缺陷、偏心距與局部挫屈之梁柱最大軸壓強度Poa 104
4.4 纖維元素法之軸壓-雙軸彎矩互制圖形的建立 107
第五章考慮局部挫屈與二次彎矩效應之計算強度與試驗強度比較和P-M曲線參數研究 113
5.1 引言 113
5.2 纖維元素法計算強度與試驗強度比較 113
5.2.1 計算最大軸壓強度與試驗最大軸壓強度比較 113
5.2.2 計算純彎矩強度與試驗純彎矩強度比較 115
5.2.3 計算軸壓-單軸彎矩強度與試驗軸壓-單軸彎矩強度比較 116
5.3 考慮與不考慮局部挫屈與二次彎矩效應之軸壓-彎矩互制曲線比較
118
5.4 方形與矩形CFT柱軸壓-彎矩互制曲線參數研究 120
5.4.1 鋼管斷面寬厚比對軸壓-彎矩互制曲線的影響 120
5.4.2 混凝土強度對軸壓-彎矩互制曲線的影響 122
5.4.3 鋼材降伏強度對軸壓-彎矩互制曲線的影響 123
5.4.4 有效長度對軸壓-彎矩互制曲線的影響 125
5.4.5 初始幾何缺陷對軸壓-彎矩互制曲線的影響 126
5.4.6 偏心距對軸壓-彎矩互制曲線的影響 128
第六章結論與建議 159
6.1 結論 159
6.2 建議 161
參考文獻 162

參考文獻

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指導教授

莊德興

審核日期

2016-1-29

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