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Effective Shaping of Cold-Formed Thin-Walled Built-up Beams in Pure Bending

  • Research Article - Civil Engineering
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Abstract

Cold-formed thin-walled beams with an open cross section are widely used in different branches of industry. They tend to buckle in a variety of modes, which can be described as local, distortional, lateral-torsional buckling and bending. In this paper, the investigation on built-up I-sections, formed by assembling the stiffened cold-formed channel sections, with or without edge stiffener is presented. Parametric studies are carried out for five different section geometries with 16 specimens, tested under two point loading, to identify factors affecting the flexural strength of stiffened cold-formed steel built-up sections. The section geometries are chosen such that all types of buckling modes are met with. Critical load obtained from experiments is compared with finite element analysis results. Finally, it discusses the suitability of the current design methods (American Iron and Steel Institute) and provides design recommendations for stiffened cold-formed built-up sections.

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Abbreviations

A :

Area of cross section (Sq.mm)

L :

Length of beam (mm)

a :

Width of stiffened element (mm)

b :

Width of flat flange element (mm)

c :

Depth of lip (mm)

d :

Width of lip (mm)

D :

Total depth of web (mm)

H :

Total depth of section (mm)

B :

Total width of section (mm)

W :

Width of flange element (mm)

r min :

Radius of gyration (mm3)

P y :

Yield load (kN)

P Exp :

Experimental critical load (kN)

P FEM :

ANSYS critical load (kN)

P AISI :

Nominal strength using AISI (kN)

P′AISI :

Modified nominal flexural strength using AISI (kN)

R :

Coefficient of determination

min:

Minimum radius of gyration

y:

Yielding

EXP:

Experiment

FEM:

Finite element method

AISI:

American Iron and Steel Institute

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Author information

Authors and Affiliations

  1. Department of Civil Engineering, K. S. Rangasamy College of Technology, Namakkal Dt, Tamil Nadu, India

    P. Manikandan & T. U. Balaji

  2. Department of Civil Engineering, Government College of Engineering, Salem Dt, Tamil Nadu, India

    S. Sukumar

Authors
  1. P. Manikandan
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  2. S. Sukumar
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  3. T. U. Balaji
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Correspondence to P. Manikandan.

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Manikandan, P., Sukumar, S. & Balaji, T.U. Effective Shaping of Cold-Formed Thin-Walled Built-up Beams in Pure Bending. Arab J Sci Eng 39, 6043–6054 (2014). https://doi.org/10.1007/s13369-014-1261-x

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  • DOI: https://doi.org/10.1007/s13369-014-1261-x

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