矩形鋼管混凝土柱考慮二次彎矩效應之軸壓-彎矩互制曲線研究

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林鈺盛(Yu-sheng Lin) 查詢紙本館藏

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土木工程學系

論文名稱

矩形鋼管混凝土柱考慮二次彎矩效應之軸壓-彎矩互制曲線研究

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摘要(中)

本研究採用非線性之纖維元素法 (Fiber element method)建立考慮二次彎矩效應之矩形填充型鋼管混凝土柱 (Concrete-filled steel tube, CFT)的軸壓雙向彎矩互制曲線。本研究採用的纖維元素法經由假設柱身之變形函數後，能考慮二次彎矩效應，並計算能施加於柱端之最大彎矩，由分析不同軸壓力所對應之彎矩強度可建立考慮二次彎矩效應之軸壓彎矩互制曲線。多組矩形CFT柱之軸壓彎矩試驗數據用來驗證纖維元素法分析CFT柱之合理性，並藉由參數研究探討纖維元素法、AISC-LDFD與ACI之適用範圍，結果發現纖維元素法在分析CFT柱受單向彎矩時能準確的計算彎矩強度，AISC與ACI則於柱長較短的案例較能計算出合理的彎矩強度。本研究將不同寬厚比、材料強度與有效柱長的CFT柱互制曲線歸納為一般化的互制公式，做為建立互制曲線之建議公式。

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). Second-order effect is considered by assuming the deflected shape of the CFT beam-columns. Determine the maximum moment at the column ends for different axial compression loads by fiber element analysis method, the interaction curves are constructed and second-order effect is considered. Analytical results are verified by comparing with the experimental results. For the cases that the fiber element analysis method, AISC-LRFD and ACI can accurately predict the flexural strength, the parameters of the cases are studied in this research. The predicted results of fiber element analysis method show good agreement with the uniaxial bending tests. The AISC-LRFD and ACI is suitable predict the flexural strength of short CFT beam-columns. To construct the general interaction equations, interaction curves of CFT beam-columns with different width-to-thickness ratio, material strength and column lengths are considered in the equations.

關鍵字(中)

★ 填充型鋼管混凝土柱
★ 軸壓-彎矩互制曲線
★ 纖維元素法
★ 二次彎矩效應

關鍵字(英)

論文目次

摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VII
圖目錄 IX
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 10
第二章 AISC與ACI設計CFT梁柱構材的檢核程序 13
2.1 引言 13
2.2 AISC-LRFD-2010對CFT梁柱的檢核方法一 13
2.3 AISC-LRFD-2010對CFT梁柱的檢核方法二 20
2.4 ACI檢核 CFT梁柱的方法 21
第三章以纖維元素法建立考慮二次彎矩效應之矩形CFT梁柱構件的互制曲線 32
3.1 基本假設 32
3.2 建立纖維元素之應變與應力 32
3.3 考慮初始幾何缺陷與偏心距之梁柱最大軸壓強度Poa 36
3.4 纖維元素法分析梁柱之軸壓雙向彎矩互制曲線 39
第四章纖維元素法考慮二次彎矩效應之分析結果與試驗結果的比較 49
4.1 引言 49
4.2 纖維元素法計算強度與單向彎矩試驗強度之比較 50
4.2.1 b/t對單軸偏心彎矩強度比較之影響 56
4.2.2 B1對單軸偏心彎矩強度比較之影響 57
4.2.3 對單軸偏心彎矩強度比較之影響 59
4.3 纖維元素法計算強度與單向彎矩試驗強度於同軸壓比較 60
4.4 纖維元素法計算強度與單向及雙向彎矩試驗強度比較 62
4.5 以混凝土最大應力為分析對分析結果的影響 65
第五章軸壓單向彎矩互制曲線之建議公式 81
5.1 引言 81
5.2 建立軸壓彎矩強度互制公式 81
5.2.1 梁柱斷面強度之軸壓彎矩互制曲線 83
5.2.2 彎矩放大因子 87
5.3 軸壓彎矩交互影響曲線之比較 90
第六章結論與建議 118
6.1 結論 118
6.2 建議 120
參考文獻 121

參考文獻

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指導教授

莊德興

審核日期

2015-7-22

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