摘 要
本文利用有限元素軟體ABAQUS來分析複合材料圍束不同斷面形狀之混凝土構材的軸向抗壓強度與其應力－應變曲線之力學行為。主要透過考慮實際情況之材料行為，提出較合理的非線性分析模式，並利用有限元素軟體ABAQUS來執行此非線性之數值計算。將數值模擬之結果與現有的實驗資料比對，以驗證分析模式之正確性。本文並針對混凝土強度、寬厚比、圍壓、混凝土軟化參數與圍束混凝土之應力應變的關係提出來討論。
本文分別採三種斷面形狀(圓形、正方形、矩形)與十六組不同混凝土強度、複合材料厚度的試體實驗做比較，依據分析結果顯示，在調整適當的圍壓值可以準確的預測出複合材料圍束混凝土構材的軸向抗壓強度與混凝土軟化參數之值，並從其應力－應變曲線的趨勢皆與實驗數據的吻合程度提出討論，證明在單軸壓力作用下，本文所建議之分析模式合理且精確。

Abstract
This paper use ABAQUS software to analyze different shapes of concrete columns under axially loading strengthened by fiber reinforced composite materials and the relationship of axil stress and axial strain. Mainly propose more rational nonlinear analyses by considering the true material behavior, using ABAQUS to calculate this nonlinear numerical value. Via verifying with the experiment data, exactness by way of confirming and analyzing. This paper also takes the difference of strength of concrete , width-to-thickness ratio(D/t), lateral pressure (fl)and parameter of concrete softening(k3) and the relation of the stress-strain of concrete confined by fiber reinforced composite materials.
This paper compares three shapes (circular, square, and rectangular), sixteen specimens of different strength of concrete, and thickness of composite materials. The result shows that, after adjusting the value of lateral pressure (fl) and parameter of concrete softening, the prediction can be accurate in concrete strengthed by fiber reinforced composite materials. And the trends of its stress-strain curve are all quite identical with the experimental data. The way to analyze concrete columns under axially loading in proving the model of this paper is rational and accurate.

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