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Web Crippling Behaviour of Cold-Formed High-Strength Steel Unlipped Channel Beams Under Interior-Two-Flange Load Case

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Abstract

Cold-Formed Steel (CFS) sections are vulnerable to certain local and global failures, especially web crippling failures. CFS beams are generally employed in construction practices mainly as floor joists or bearers. The design standards, AISI S100, AS/NZS 4600 and Eurocode 3 Part 1–3 predict the web crippling capacity of CFS sections according to the experimental studies conducted in previous years. In most of the cases, the predictions of the equations were unsafe and hence innovative concepts of CFS should be examined undergoing web crippling. Therefore, the web crippling behaviour of the unlipped channel sections with high-strength material under Interior-Two-Flange (ITF) loading condition was investigated in this study by following the AISI S909 standard test method defined for web crippling. Numerical simulations using Finite Element Analysis (FEA) software (ABAQUS) were conducted on 243 parametric studies to replicate the loading conditions of ITF following a proper validation. Parametric study data were then taken into account to determine the accuracy of existing equations for web crippling capacity in the design standards and existing literature. Since the available design equations were conservative or unsafe and considering the empirical nature of CFS sections in terms of web crippling capacity, new modified equations were proposed to predict the ultimate web crippling capacity of high-strength unlipped channel sections and a new design approach based on the Direct Strength Method (DSM) was also developed.

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Abbreviations

d1 :

Flat portion of web

d:

Depth of the section

N:

Bearing length

t:

Section thickness

ri :

Inside corner radius

E:

Young’s modulus

fy :

Material yield strength

C:

Coefficient

CR :

Coefficient of inside bend radius

CN :

Coefficient of bearing length

Ch :

Coefficient of slenderness

(φw):

Capacity reduction factors

Cf :

Strength factor

Rb :

Web crippling strength

λ:

Slenderness of the section

Rb,cr :

Critical buckling load

Cb,l :

Coefficient of bearing length to thickness ratio

Cb,b :

Coefficient of flange width to thickness ratio

Nm :

Yield mechanism length

rm :

Inside bent radius measured along the middle of the section

rext :

External bent radius

bf :

Flange width

θ:

Angle between the plane of the web and the bearing surface

FE:

Finite Element

COV:

Coefficient of Variation

k:

Buckling coefficient

v:

Poisson’s ratio

Cb :

General coefficient

Cb,r :

Coefficient of inside bent radius to thickness ratio

Cb,w :

Coefficient of web slenderness ratio

Rb,y :

Yield load

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Acknowledgements

The authors are grateful to Northumbria University, The Home Engineers and European Research Council for massive support to conduct this research study.

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Authors and Affiliations

  1. Department of Mechanical and Construction Engineering, Northumbria University, Newcastle upon Tyne, UK

    Elilarasi Kanthasamy, Keerthan Poologanathan, Marco Corradi, Muhammad Rahman & Kajaharan Thirunavukkarasu

  2. Department of Civil Engineering, School of Engineering, Al-Hussein Bin Talal (AHU) University of Ma’an, Ma’an, Jordan

    Husam Alsanat

  3. School of Computing, Engineering, and Digital Technologies, Teesside University, Teesside, UK

    Perampalam Gatheeshgar

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  1. Elilarasi Kanthasamy
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Correspondence to Elilarasi Kanthasamy.

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Kanthasamy, E., Alsanat, H., Poologanathan, K. et al. Web Crippling Behaviour of Cold-Formed High-Strength Steel Unlipped Channel Beams Under Interior-Two-Flange Load Case. Int J Steel Struct 23, 914–928 (2023). https://doi.org/10.1007/s13296-023-00739-x

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