Research Article

Lateral-Torsional Instability and Biaxial Bending of Imperfect FRP I-Beams

Jodi Knorowski
WPD Consulting Engineers & Associates, USA.
Stella B. Bondi
Naval Sea Systems Command, USA.
Zia Razzaq
Old Dominion University, USA.
* Corresponding author
DOI icon 10.24018/ejeng.2022.7.6.2687

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Submitted 2021-12-01
Published 2022-11-10

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Article Main Content

This paper presents the outcome of a theoretical and experimental study of the behavior of Fiber Reinforced Polymer (FRP) I-beams exposed to lateral-torsional instability or when subjected to biaxial bending. Laboratory experiments involved the application of vertical and horizontal static loads to a 4 x 4 x ¼ in. I-beam with various lengths and the resulting deflections were recorded. Governing biaxial flexure and torsion differential equations were modified to account for the presence of initial imperfections and subsequently solved using a central finite-difference scheme. The theoretical predictions of the beam behavior were found to be in good agreement with what was observed in the laboratory.

Keywords: Biaxial, Fiber Reinforced Polymer, I-beam, Imperfect, Lateral-Torsional Instability.

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