包覆填充型箱型柱接力式繫筋對混凝土圍束的有效性

The Effectiveness of Combined Ties on the Confinement of Encased Concrete-Filled Box Columns

10.6849/SE.202003_35(1).0002

陳正誠(Cheng-Cheng Chen)；吳品達(Pin-Da Wu)；許瑜麟(Yu-Lin Hsu)

包覆填充型箱型柱 ； 鋼骨鋼筋混凝土柱 ； 填充型箱型柱 ； 包覆型SRC柱 ； 接力式繫筋 ； Encased Concrete-Filled Box Columns ； steel reinforced concrete column ； concrete filled box column ； SRC column ； encased box column ； combined tie

結構工程

35卷1期（2020 / 03 / 01）

31 - 51

繁體中文

包覆填充型箱型柱的橫向鋼筋，除了外圍之圍束箍筋外通常也需要配置繫筋以滿足規範之要求。但是傳統繫筋受到鋼骨箱型柱的阻撓而無法直通，因此箱型柱外側混凝土的圍束往往無法滿足規範的要求，使用「接力式繫筋」為可能解決這個問題的方法。接力式繫筋傳遞圍束力的路徑為「第1支短繫筋－橫向箱型柱柱板－縱向箱型柱柱板－另一橫向箱型柱柱板－第2支短繫筋」。本文完成6組大尺寸（斷面尺寸550×550以上）包覆填充型箱型柱試體之反復側向載重試驗，探討接力式繫筋之有效性。試驗試體之寬厚比在27～37之間，因此下述結論適合使用於柱板寬厚比不大於37之情況。試驗結果發現：（1）接力式繫筋可以取代直通式繫筋；（2）接力式繫筋可以有效圍束箱型柱外側之混凝土；（3）接力式繫筋對橫向鋼筋量之貢獻可以採用短繫筋之斷面積計算之。

In an encased concrete-filled box column, the concrete inside the steel box column is confined by the box column. However, the confinement of the concrete outside the box column (referred as outer concrete hereafter) need to be provided by the steel cage which is composed of main reinforcement and transverse reinforcement. Due to the existence of the steel box column, the traditional ties used in RC columns can not be implemented here. The use of so called combined tie was introduce to solve this problem. The confinement force was transferred from the first short tie bar to the box column and then to the second short tie bar located at the opposite side of the box column. In this article, six large scale (column size larger than 550×550) was tested under cyclic lateral loading to investigate the effectiveness of using the combined tie. The range of the width-to-thickness ratio of steel plate investigated was between 27 and 37, therefore the test result was applicable to column with width-to-thickness ratio less than 37. Some conclusion can be drawn based on the test results: (1) the combined tie can substitute the use of conventional tie bar, (2) the combined tie is effective in confining the outer concrete, and (3) the confinement effect contributed by combined tie can be determined using the cross section of the short tie bar.

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