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Structural Engineering and Mechanics
  Volume 70, Number 4, May25 2019 , pages 499-511
DOI: https://doi.org/10.12989/sem.2019.70.4.499
 


Study on axial compressive behavior of quadruple C-channel built-up cold-formed steel columns
Shaofeng Nie, Tianhua Zhou, Fangfang Liao and Donghua Yang

 
Abstract
    In this study, the axial compressive behavior of novel quadruple C-channel built-up cold-formed steel columns with different slenderness ratio was investigated, using the experimental and numerical analysis. The axial compressive capacity and failure modes of the columns were obtained and analyzed. The finite element models considering the geometry, material and contact nonlinearity were developed to simulate and analyze the structural behavior of the columns further. There was a great correlation between the numerical analyses and test results, which indicated that the finite element model was reasonable and accurate. Then influence of, slenderness ratio, flange width-to-thickness ratio and screw spacing on the mechanical behavior of the columns were studied, respectively. The tests and numerical results show that due to small slenderness ratio, the failure modes of the specimens are generally local buckling and distortional buckling. The axial compressive strength and stiffness of the quadruple C-channel built-up cold-formed steel columns decrease with the increase of maximum slenderness ratio. When the screw spacing is ranging from 150mm to 450mm, the axial compressive strength and stiffness of the quadruple C-channel built-up cold-formed steel columns change little. The axial compressive capacity of quadruple C-channel built-up cold-formed steel columns increases with the decrease of flange width-thickness ratio. A modified effective length factor is proposed to quantify the axial compressive capacity of the quadruple C-channel built-up cold-formed steel columns with U-shaped track in the ends.
 
Key Words
    cold-formed steel; built-up section; compressive tests; numerical analysis; axial compressive capacity; effective ratio of width-to-thickness method; direct strength method
 
Address
Shaofeng Nie, Tianhua Zhou, Fangfang Liao: School of Civil Engineering, Chang\'an University, 710061, China
Donghua Yang: China West Airport Group, Xian, 710075,China
 

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