Eccentric Compression Behaviors of Self-Compacting Concrete-Filled Thin-Walled Steel Tube Columns

Yunyang Wang; Shengwei Sun; Liqing Zhang; Yandong Jia; Guang Yang; Meng Li; Wei Tan; Jianmin Qu

doi:10.3390/ma16186330

Eccentric Compression Behaviors of Self-Compacting Concrete-Filled Thin-Walled Steel Tube Columns

Materials (Basel). 2023 Sep 21;16(18):6330. doi: 10.3390/ma16186330.

Authors

Yunyang Wang¹, Shengwei Sun², Liqing Zhang³, Yandong Jia⁴, Guang Yang¹, Meng Li¹, Wei Tan⁵, Jianmin Qu⁵

Affiliations

¹ School of Civil and Architecture Engineering, Hunan University of Arts and Science, Changde 415000, China.
² China Construction Second Engineering Bureau Co., Ltd., Beijing 100054, China.
³ School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China.
⁴ School of Civil and Architecture Engineering, Liaoning University of Technology, Jinzhou 121000, China.
⁵ Hunan Bolian Engineering Testing Co., Ltd., Changde 415000, China.

Abstract

For the sake of solving sustainability issues and analyzing the complicated service force states, eccentric compression experiments on self-compacting concrete-filled thin-walled medium-length steel tube columns with a circular cross-section were carried out in the present study. Thereafter, the influence of the eccentric ratios and the wall thickness factors on the mechanical behavior and failure characteristics of both the eccentrically loaded and axially loaded columns was comprehensively analyzed. Finally, prediction formulas for the ultimate load of the columns under eccentric compression were proposed, and a comprehensive comparison of the ultimate loads between the predicted values and experimental values was also conducted. The results indicated that the typical failure characteristics of the eccentrically loaded columns presented lateral deflection together with buckling, while the axially compressed columns displayed expansion and rupture at local positions. Moreover, the ultimate loads of the eccentrically loaded columns decreased by 43.0% and 34.5% in comparison to the columns under axial compression, with the wall thickness factor decreasing from 116.7 to 46.7, respectively. Meanwhile, the ratios of the ultimate loads calculated using design codes to the tested values were in the range of 0.70~0.90, which demonstrated that the design codes could predict the ultimate loads conservatively. Additionally, the ratios of the ultimate loads calculated using the proposed formulas to the tested values were within the range of 0.99~1.08, implying that the proposed formulas were more accurate than the design codes. At the same time, the initial stiffness of the columns under eccentric compression was correspondingly lower than that of the columns undergoing axial compression. The lateral deflections along the height of the columns were almost symmetrical at different loading levels. This study could provide a meaningful approach for designing columns and facilitate their application in civil industry.

Keywords: eccentric compression; failure characteristics; mechanical performances; self-compacting concrete; thin-walled steel tubes.

Abstract

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