Unified Solution of the Ultimate Bearing Capacity for Stiffened and Thin-Walled Square CFST Short Columns under Axial Compression

Abstract:

Directed against the stiffened and thin-walled square concrete-filled steel tubular (CFST) short columns, the paper simplifies the square CFST columns into the circle ones by introducing the strength reduction coefficient of concrete and the equivalent constraint reduction coefficient. On the basis of the unified strength theory, the united solution of the ultimate bearing capacity for square CFST columns is deduced after considering the influence of strength-differential in tension and compression and intermediate principal stress. Some influencing factors are also analyzed in the paper. Through comparing the results of proposed formula with that of experiments of relevant literatures，the rationality of proposed formula is proved. The solution may provide theoretical references for the study of the ultimate bearing capacity for stiffened and thin-walled square CFST short columns.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 797-804
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.797
• Online since: May 2013
• Authors: Jian Feng Xu, Peng Wu, Jun Hai Zhao, Yan Li, Wen Biao Liang
• Keywords: Short Columns under Axial Compression, Square Concrete-Filled Steel Tube, Stiffening Rib, Ultimate Bearing Capacity, Unified Strength Theory

References

[1] Zhong Tao, Qing Yu. Test, theory and method for new type of composite structure column [M]. Beijing: Science Press, 2006, in Chinese.

[2] Yi Li, Hong Huang, Ange Zhang. Study of pure bending mechanical properties for the concrete-filled square stiffened thin-walled steel tubular [J].Railway Engineering, 2009, (10):113-116, in Chinese.

[3] Hong Huang , Mengcheng Chen, Chengyong Wan. Behavior of concrete-filled stiffened square steel tubes subjected to eccentric compressive load [J].China Civil Engineering Journal, 2011, 44(10): 26-34, in Chinese.

[4] Yaochun Zhang, Yong Chen. Experimental study and finite element analysis of square stub columns with straight ribs of concrete-filled thin-walled steel tube [J]. Journal of Building Structures, 2006，27(5)：16-22, in Chinese.

DOI: 10.1016/j.tws.2018.02.024

[5] TAO Z，HAN L H，WANG D Y. Experimental behavior of concrete filled thin walled steel tubular columns [J]. Thin Walled Structures, 2007, (45): 517-527.

DOI: 10.1016/j.tws.2007.04.003

[6] Chao Xu, Yaochun Zhang, Xiaozhe Lu. Restoring force model of square concrete—filled thin—walled steel tubular column with ribs[J]. Journal of Harbin Institute of Technology, 2008,40（4）: 514-520, in Chinese.

[7] Yiyong Huang. Calculation methods of concrete-filled stiffened square steel tubes subjected to eccentric compressive load [J]. Railway Engineering, 2011,(12): 143-145, in Chinese.

[8] Lanhui Guo, Sumei Zhang, Zheng Xu, Maoge Ran. Experimental and theoretical analysis of stiffened rectangular composite columns with large height-to-breadth ratios [J]. China Civil Engineering Journal, 2011,44(1):42-49, in Chinese.

[9] Maohong Yu. Theory, development and application for strength theory of the new system [M].Xian: Xi'an Jiaotong University Press, 2011, in Chinese.

[10] Shantong Zhong. Structure of concrete-filled steel tubular [M]. Beijing: Tsinghua University Press, 2003, in Chinese.

[11] Xiaowei Li, Junhai,Zhao, Tiedong Zhu, Liang Wang. Mechanics behavior of axially loaded short columns with concrete-filled square steel tub [J]. China Journal of Highway and Transport, 2006, (4): 77-81, in Chinese.

[12] Changguang Zhang, Junhai Zhao, Xueying Wei, Ping Jia. Ultimate bearing capacity of CHS inner and SHS outer concrete-filled double skin tubes stub column [J]. Journal of Architecture and Civil Engineering, 2008, 25(4):78-82, in Chinese.

DOI: 10.4028/www.scientific.net/amm.723.422

[13] Junhai Zhao. Strength theory and Engineering application [M]. Beijing: Science Press, 2003, in Chinese.

[14] Hong Huang, Ange Zhang, Yi Li, Mengcheng Chen. Experimental research and finite element analysis on mechanical performance of concrete-filled stiffened square steel tubular stub columns subjected to axial compression [J]. Journal of Building Structure, 2011, 32(2): 75-82, in Chinese.

DOI: 10.1177/1369433218819584

[15] Hong Huang, Chengyong Wan. Experimental research of concrete-filled stiffened square steel tubes subjected to eccentric compressive load [J]. Railway Engineering, 2011, (4): 94-97, in Chinese.