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U-Frame action design according to Eurocodes
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Ricardo Pimentel of the SCI discusses the consideration of U‐Frame action to restrain members susceptible to flexural and lateral torsional buckling according to Eurocodes.
Buckling phenomena frequently govern the design of steel members under compression or for elements partially compressed. To achieve a good compromise between steel tonnage and performance, discrete restraints along the compressed member (or along the compressed part of the member) can be used. However, for certain cases, introducing restraints as part of an orthodox bracing system is not feasible and designers must use other options to achieve a capable structural solution. The use of U-frame action offers this opportunity.
https://www.newsteelconstruction.com/wp/wp-content/uploads/2021/01/NSCJan2021tech.pdf
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Ricardo Pimentel of the SCI illustrates the different methods provided by EN 1993-1-1 to
address the topics of member stability, global frame stability and second order effects.
Fundamental structural mechanics relating to stability was covered in Part 1.
NSC - News Steel Construction (http://www.newsteelconstruction.com)
https://www.newsteelconstruction.com/wp/stability-and-second-order-effects-on-steel-structures-part-2-design-according-to-eurocode-3/
Ricardo Pimentel of the SCI introduces the topics of buckling phenomenon, second
order effects and the approximate methods to allow for those effects. In part 2, the
various methods will be compared to the results from a rigorous numerical analysis.
News Steel Construction (http://www.newsteelconstruction.com)
https://www.newsteelconstruction.com/wp/stability-and-second-order-effects-on-steel-structures-part-1-fundamental-behaviour/
The buckling conditions are derived for an I-section column supported laterally by uniformly spaced side-rails which provide rigid lateral support and elastic torsional restraint, the column being subjected to any combinations of axial load and uniform or non-uniform moment about the major axis. Criteria are developed to determine, for any loading condition and given spacing of lateral supports, the minimum torsional restraint which causes buckling to occur between supports rather than in an overall mode.
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