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Behaviour of cold-formed steel built-up closed columns composed by angle profiles

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Abstract

This paper presents the experimental investigation of cold-formed built-up closed sections with intermediate web stiffeners under axial compression with hinged end conditions. The specimens were formed using two angle sections with edge and intermediate stiffeners, connected by self-tapping screws. Three series of tests were conducted by varying the width of the intermediate web element.   Twelve columns were tested by varying the column length. The specimens were failed by local, flexural, and interaction of these buckling modes. Non-linear Finite-element Analysis (FEA) was carried out using ANSYS. FEA results were compared with the experimental results. It is observed that FEA results closely resemble to experimental results. An extensive parametric study was carried out using validated finite-element model by varying the cross-sectional geometries of cold-formed built-up closed section with intermediate stiffeners. The column strengths predicted from the FEA was compared with the design strengths calculated using the AISI specification of cold-formed steel structures. The reliability of the current design method was assessed by reliability analysis.

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Abbreviations

W f :

Width of the flange element

W 1 :

Width of the top and bottom of the web element

W 2 :

Width of the inclined web element

W 3 :

Width of the intermediate stiffener of the web element

W w :

Width of the web

W l :

Width of the lip

θ :

Angle of inclination

f y :

Yield stress

f u :

Ultimate stress

E :

Young’s modulus

P n :

Nominal axial strength

A e :

Effective area

F n :

Critical buckling stress

λ c :

Non-dimensional slenderness ratio

Fe :

Least of the elastic flexural torsional and flexural–torsional buckling stress

σ FEA :

Ultimate compressive stress obtained by experiment

σ AISI :

Ultimate compressive stress obtained by AISI

β :

Safety index (Reliability index)

ϕ :

Resistance (Capacity) factor

DL:

Dead load

LL:

Live load

M m :

Mean value of the material factor

F m :

Mean value of the fabrication factor

V m :

Coefficient of variation of the material factor

V F :

Coefficient of variation of the fabrication factor

P m :

Mean value of σFEA to σAISI ratio

V p :

Coefficient of variation of σFEA to σAISI ratio

C p :

Correction factor in reliability analysis

FEA:

Finite Element Analysis

AISI:

American Iron Steel and Institute

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Authors and Affiliations

  1. Department of Civil Engineering, CMR Institute of Technology, Hyderabad, India

    G. Aruna

  2. Department of Civil Engineering, Paavai College of Engineering, Namakkal, Tamil Nadu, India

    S. Sukumar

  3. Department of Civil Engineering, Jai Shriram Group of Institution, Tiruppur, Tamil Nadu, India

    V. Karthika

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  1. G. Aruna
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  2. S. Sukumar
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  3. V. Karthika
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Correspondence to G. Aruna.

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Aruna, G., Sukumar, S. & Karthika, V. Behaviour of cold-formed steel built-up closed columns composed by angle profiles. Asian J Civ Eng 20, 1037–1048 (2019). https://doi.org/10.1007/s42107-019-00164-8

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