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Journal of Structural Engineering / Volume 137 / Issue 12 / TECHNICAL PAPERS

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Numerical Modeling of LiteSteel Beams Subject to Shear

J. Struct. Eng. 137, 1428 (2011); http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000391 (12 pages)

Poologanathan Keerthan1 and Mahen Mahendran2

1Ph.D. Researcher, Faculty of Built Environment and Engineering, Queensland Univ. of Technology, Brisbane, QLD 4000, Australia. E-mail: keeds123@qut.edu.au
2Professor, Faculty of Built Environment and Engineering, Queensland Univ. of Technology, Brisbane, QLD 4000, Australia (corresponding author). E-mail: m.mahendran@qut.edu.au

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(Submitted 8 April 2010; accepted 10 February 2011; posted ahead of print 12 February 2011)

A LiteSteel beam (LSB) is a new cold-formed steel hollow flange channel beam produced by using a patented manufacturing process involving simultaneous cold-forming and dual electric resistance welding. It has the beneficial characteristics of torsionally rigid closed rectangular flanges combined with the economical fabrication processes from a single strip of high-strength steel. Although the LSB sections are commonly used as flexural members, no research has been conducted on the shear behavior of LSBs. Therefore, experimental and numerical studies were conducted to investigate the shear behavior and strength of LSBs. In this research, finite-element models of LSBs were developed to investigate their nonlinear shear behavior, including their buckling characteristics and ultimate shear strength. They were validated by comparing their results with available experimental results. The models provided full details of the shear buckling and strength characteristics of LSBs and showed the presence of considerable improvements to web shear buckling in LSBs and associated postbuckling strength. This paper presents the details of the finite-element models of LSBs and the results. Both the finite-element analysis (FEA) and experimental results showed that the current design rules in cold-formed steel codes are very conservative for the shear design of LSBs. The ultimate shear capacities from FEAs confirmed the accuracy of proposed shear strength equations for LSBs on the basis of the North American specification and direct strength method (DSM) design equations. Developed finite-element models were used to investigate the reduction to shear capacity of LSBs when full-height web side plates were not used or when only one web side plate was used, and these results are also presented in this paper.

© 2011 American Society of Civil Engineers

Acknowledgments

The writers would like to thank Australian Research Council and OneSteel Australian Tube Mills for their financial support and the Queensland University of Technology for providing the necessary facilities and support to conduct this research project. They would also like to thank Mr. Ross Dempsey, Manager of Research and Testing, OneSteel Australian Tube Mills, for his technical contributions and his overall support to the many different phases of this research project.

Article Outline

  1. Introduction
  2. Finite Element Analyses of the Shear Behavior of LSBs
    1. Model Description
    2. Material Model and Properties
    3. Loads and Boundary Conditions
    4. Initial Geometric Imperfections
    5. Residual Stresses
    6. Analysis Methods
    7. Comparison of FEA and Experimental Results
    8. Shear Yielding
    9. Inelastic Shear Buckling
    10. Elastic Shear Buckling
    11. Validation of Finite-Element Model Using Experimental Results
    12. Proposed Design Formulas for the Shear Strength of LiteSteel Beams
    13. Direct Strength Method
    14. Effect of Web Side Plate Height on the Shear Behavior and Strength of LSBs
    15. Effect of One Web Side Plate on the Shear Behavior and Strength of LSBs
  3. Conclusions

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ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000391

PUBLICATION DATA

ISSN

0733-9445 (print)  
1943-541X (online)

Publisher

American Society of Civil Engineers

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