本研究共完成16 支SRC短柱試體之軸向載重試驗，探討鋼骨翼板寬度及圍束形狀對高圍束區混凝土之圍束效應。此外，本文依據實驗結果，分別建立直線性或圓弧形圍束形狀下之分析模型，以模擬高圍束區混凝土之應力-應變曲線。
研究結果顯示：(1)無論是直線性或圓弧形圍束下之SRC試體，其高圍束區混凝土的圍束效應皆不隨鋼骨翼板寬度的變化而有明顯之差異；(2)圓弧形較直線性有更好的圍束效果，圍束混凝土極限強度較高；(3)腹板會隨著翼板寬度之增大而發揮較大之圍束拉應力；(4)使用本文建議模型之分析結果與試驗結果相符程度頗佳。

A total of 16 concrete encased steel stub columns (SRC) were tested under monotonic compression loading to study the effect of concrete confinement provided by the cross-sectional steel shape. The cross-sectional steel shapes used were of 4 differents width-to-thickness ratio and the shape of confined concrete section includes cruciform and rounded cruciform types. In addition, concrete stress-strain curve models were developed.
Based on the results obtained, it is concluded as: (1) width-thickness ratio of flange do not influence the confine stress for either rectangular or circular confined shape, (2) the confining effect of rounded cruciform shape concrete section was higher than that of cruciform shape concrete section, (3) the tension stress provided by web of steel is higher as the width of flange increases, and (4) the proposed concrete stress-strain model gives good agreement with the experimental results.

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