Steel and Composite Structures

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Experimental study on cold-formed lipped channel stub columns reinforced by steel bars or steel strips

  • Chen, Jian-Feng (School of Civil Engineering, Chang'an University) ;
  • Chen, Ming-Qi (School of Civil Engineering, Chang'an University) ;
  • Shen, Yong-Kang (School of Urban Planning and Municipal Engineering, Xi'an Polytechnic University) ;
  • Shao, Jian-Hua (Experimental Center of School of Civil Engineering and architecture, Jiangsu University of Science and Technology) ;
  • Yang, Xin-Xin (School of Civil Engineering, Chang'an University)
  • Received : 2020.12.18
  • Accepted : 2021.05.31
  • Published : 2021.08.10
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Abstract

In this paper, the axial compressive properties of cold-formed steel lipped channel stub columns strengthened by rebars or steel strips are experimentally studied. The experiment included two sections. A kind of columns with local buckling is reinforced longitudinally by steel strips at the web. The other is the columns with distorted buckling, which is reinforced longitudinally by steel bars at the curling edge. The failure mode, deformation characteristics, ultimate bearing capacity and load displacement curve of the specimen are obtained through the experiment. On the basis of the experiment, the calculation results of theoretical axial bearing capacity of cold-formed steel lipped channel stub columns in Chinese, North American and Australian code are compared and analyzed. Research indicates: First, the cold-formed steel lipped channel stub columns strengthened by steel bars or steel strips can effectively improve the compressive bearing capacity of the specimen. Secondly, when the initial stress ratio of specimen is less than 0.3, the reinforcement effect is ideal. Thirdly, the three standards don't stipulate the calculation of theoretical bearing capacity of the specimen strengthened after loading, so there is a large deviation between the theoretical calculation value and the test value.

Keywords

Acknowledgement

The authors are sincerely appreciated to the financial support as following: 1. The Fundamental Research Funds for the Central Universities, CHD (Program No. 300102289104) 2. The Natural Science Foundation of Shaanxi Province China (Program No. 2019JM-522).

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