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Effective material model for cold-formed rectangular hollow sections in beam element-based advanced analysis.
- Source :
-
Journal of Constructional Steel Research . Nov2022, Vol. 198, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- This study develops and validates an effective material model for cold-formed rectangular hollow sections. Advanced design methods utilize non-linear finite element analysis in design. An accurate calculation model, which is usually beam element-based, is crucial such that the design outcome is safe but economical. Unfortunately, cold-formed sections have non-linear residual stress distribution over the material thickness, that cannot be explicitly modelled in general-purpose beam elements. Additionally, corner regions of cold-formed sections have higher material strength compared to flat regions. This beneficial feature is usually disregarded by assuming the flat region properties for the entire cross-section. This study develops an effective material model that replicates a stress-strain curve that would be obtained if the tensile test was made for the entire cross-section instead of a separate tensile coupon. Consequently, the effects of residual stresses and corner strength enhancements are included in the effective material model such that their consideration in beam element-based advanced design method is effortless. The effective material model is validated for the steel grade S700 against numerical shell element buckling tests and excellent modelling accuracy is achieved. • Nonlinear material model with effects of residual stresses and cold-forming • Proposed model is applicable to nonlinear finite element analysis with beam elements • Material model facilitates implementing material imperfections in advanced analysis • Accurate prediction of global member buckling capacity • The model is validated for cold-formed tubular sections made of high-strength steel [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0143974X
- Volume :
- 198
- Database :
- Academic Search Index
- Journal :
- Journal of Constructional Steel Research
- Publication Type :
- Academic Journal
- Accession number :
- 159569712
- Full Text :
- https://doi.org/10.1016/j.jcsr.2022.107569