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Structural Engineering and Mechanics
  Volume 74, Number 3, May10 2020 , pages 381-394

Behavior of CFS built-up battened columns: Parametric study and design recommendations
Vijayanand S and Anbarasu M

    The structural performance of cold-formed steel (CFS) built-up battened columns were numerically investigated in this paper. The built-up column sections were formed by connecting two-lipped channels back-to-back, with a regular spacing of battens plates, and have been investigated in the current study. Finite element models were validated with the test results reported by the authors in the companion paper. Using the validated models, the parametric study was extended, covering a wider range of overall slenderness to assess the accuracy of the current design rules in predicting the design strengths of the CFS built-up battened columns. The parameters viz., overall slenderness, different geometries, plate slenderness (b/t ratio) and yield stress were considered for this study. In total, a total of 228 finite element models were analyzed and the results obtained were compared with current design strength predicted by Effective Width Method of AISI Specifications (AISI S100:2016) and European specifications (EN1993-1-3:2006). The parametric study results indicated that the current design rules are limited in predicting the accuracy of the design strengths of CFS built-up battened columns. Therefore, a design equation was proposed for the AISI and EC3 specifications to predict the reliable design strength of the CFS Built-up battened columns and was also verified by the reliability analysis.
Key Words
    cold-formed steel; effective width method; lipped channel; numerical study; battened column; reliability analysis; built-up columns
Vijayanand S: Department of Civil Engineering, Kongu Engineering College, Perundurai, Tamilnadu, India
Anbarasu M: Department of Civil Engineering, Government College of Engineering, Salem, Tamilnadu, India

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