受十字形鋼骨斷面圍束混凝土應力－應變行為之試驗研究

Experimental Stress-Strain Behavior of the Concrete Confined by Cross-H Steel Cross-Sectional Shape

陳正誠(Cheng-Cheng Chen) ； 陶其駿(Chi-Chun Tao) ； 楊雄清(Shaung-Chin Yang) ； 蔡煒銘(Wei-Ming Tsai)

《中國土木水利工程學刊》 22卷4期 (2010/12) Pp. 423-434

https://doi.org/10.6652/JoCICHE.201012_22(4).0007

摘要

本研究共完成16支大尺寸，含十字形（XH）鋼骨及混凝土短柱試體之載重試驗。研究結果發現：（1）XH鋼骨斷面可以有效提供混凝土圍束作用，但是其機制與橫向鋼筋有所不同；（2）XH在混凝土應力達到0.80 f'c以後，鋼骨才開始對混凝土產生較明顯的圍束作用；（3）XH鋼骨所圍束之混凝土範圍，可以假設翼板端與翼板端之間為「圓弧形」；（4）XH翼板寬厚比在6至10之間時，受鋼骨圍束混凝土之應力－應變曲線，基本上不隨翼板寬厚比之大小而改變；（5）本文所建議受鋼骨圍束混凝土之應力－應變曲線，簡單而方便使用，可提供相關研究之參考。

關鍵字

柱 ； SRC結構 ； 包覆型SRC柱 ； 圍束混凝土

並列摘要

A total of 16 concrete encased steel stub columns (SRC) were tested under monotonic compression to study the effect of concrete confinement provided by the cross-H steel shape. Based on the test results obtained, it is concluded as: (1) cross-H steel shapes are able to provide obvious confinement to the concrete, but the mechanism of the confinement is different from that of transverse reinforcing bars. (2) cross-H steel shape doesn't provide obvious concrete confinement until the concrete stress reaches 80% of the unconfined concrete compressive strength. (3) the shape of the concrete region confined by cross-H steel shape is more likely a shape that connect the tip of the flange to the tip of the neighboring flange by an arc; (4) the confined concrete stress-strain shape is basically independent of the with-to-thickness ratio of the flange within the research range; (5) a stress-strain relationship is proposed for the concrete confined by cross-H steel shape based on the test data obtained.

並列關鍵字

SRC column ； concrete confinement ； encased steel column ； column