A Displacement-Based Fiber Element to Simulate Interactive Lateral Torsional and Local Buckling in Steel Members
Publication: Journal of Structural Engineering
Volume 149, Issue 5
Abstract
Collapse in steel structures is often controlled by loss of load carrying capacity of steel columns due to interactive buckling, which involves interactions between local and global (i.e., lateral and lateral torsional) buckling. Commonly used concentrated plastic hinge or fiber-based elements do not simulate the physics of this response, potentially leading to inaccuracy in performance assessment. A nonlinear fiber-beam-column element [termed the Torsion Fiber Element (TFE)] to simulate monotonic interactive buckling in steel beam-columns is presented. The element, implemented in the OpenSees platform, incorporates St. Venant as well as warping torsion through enrichment of strain interpolation functions, in addition to axial and flexural deformation modes. Local buckling is represented through a softening multiaxial constitutive relationship. The efficacy of this approach is examined by comparing its results against those obtained from continuum finite element simulations as well as experimental data on beam-columns subjected to monotonic loading. The comparisons indicate that the element can functionally represent the physics underlying interactive buckling, resulting in effective prediction of the overall monotonic load-deformation response, as well as internal deformation and stress fields. Limitations of the element in its current form are summarized, along with prospective improvements.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work was supported by the US National Science Foundation (Grant # CMMI-1926202) and by the Suisse National Science Foundation (Award Number: 200021_188476), and an internal research grant from École Polytechnique Fédérale de Lausanne. The findings and opinions presented in this paper are entirely those of the authors.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 5 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jul 25, 2022
Accepted: Nov 30, 2022
Published online: Mar 9, 2023
Published in print: May 1, 2023
Discussion open until: Aug 9, 2023
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