New modeling strategies for analyzing lateral-torsional buckling in class-4 steel structural members at elevated temperatures using beam-type elements
نویسندگان
چکیده
Fire is one of the main hazards that can affect steel buildings and bridges was responsible, e.g., for collapse Plasco building in Tehran, Iran, I-65 bridge Birmingham, Alabama, USA. This vulnerability has motivated development advanced computational models to predict response structures fire accurately. The mechanical slender members especially important because they fail prematurely by buckling at load values below their elastic strength. However, structural analysis these typically requires complex FE with shell elements, including initial geometric material imperfections. These are computationally expensive, complicating carrying out parametric probabilistic studies. Therefore, there a need develop simple, accurate, low-cost as reliable shell-type models. To overcome this knowledge gap, paper presents two new modeling strategies simulate class-4 subjected lateral-torsional using Timoshenko beam-type finite which significantly simplify modeling. called Fiber Beam Model (FBM) Cruciform Frame (CFM) include imperfections thermal strains. In FBM, member represented single fiber I-section beam whereas CFM, cruciform arrangement rectangular element fibers idealizes it, making CFM more build than FBM. Both were satisfactorily validated experimental numerical results Test-1 Test-3 carried “Fire design welded or hot-rolled cross-section” (FIDESC4) research project on section. Although both FBM correctly captured LTB resistance tested beam, can, addition, adequately reproduce local failure reduced time. That means engineering problems such optimization analyses thin-walled beams be addressed easily accurately, representing an step towards applying performance-based approaches under fire.
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ژورنال
عنوان ژورنال: Structures
سال: 2021
ISSN: ['2352-0124']
DOI: https://doi.org/10.1016/j.istruc.2021.09.087