Journal article
Lateral-Torsional Buckling of Singly Symmetric I-Girders with Stepped Flanges
Journal of structural engineering (New York, N.Y.), v 146(10), 04020203
01 Oct 2020
Abstract
Guidance for the lateral-torsional buckling behavior of singly-symmetric, nonprismatic (stepped flanges) sections are often absent from design specifications or are overly simplified. This paper presents simplified design procedures that estimate the buckling capacity of these complex systems that commonly face designers. The results of a robust parametric finite-element study that included 14,040 unique prismatic and nonprismatic beam sections are detailed. The study specifically examines the effects of common span-to-depth ratios, intermediate bracing schemes, degrees of monosymmetry, variable flange transitions, and moment gradients on the buckling response. A proposed weighted-average section approach as well as traditional moment gradient expressions are evaluated based on their ability to accurately approximate the finite-element solutions of these singly-symmetric and/or nonprismatic beams. The computational study and proposed design expressions focus on elastic buckling behavior, midheight loads, and stiffened web elements, such that distortional effects that may limit the beam capacity are precluded. This approach matches the assumptions used to derive the classic analytical solutions adopted in most design specifications. For a broad range of conditions, the proposed methods are shown to produce reasonable and reliable estimates of the buckling capacity obtained from the finite-element models. (C) 2020 American Society of Civil Engineers.
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Details
- Title
- Lateral-Torsional Buckling of Singly Symmetric I-Girders with Stepped Flanges
- Creators
- Matthew C. Reichenbach - The University of Texas at AustinYangqing Liu - Tongji UniversityTodd A. Helwig - The University of Texas at AustinMichael D. Engelhardt - Texas Department of Transportation
- Publication Details
- Journal of structural engineering (New York, N.Y.), v 146(10), 04020203
- Publisher
- Asce-Amer Soc Civil Engineers
- Number of pages
- 18
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000561743900011
- Scopus ID
- 2-s2.0-85088585643
- Other Identifier
- 991021959040804721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Construction & Building Technology
- Engineering, Civil