Design of built-up steel beam-columns composed of two-channel sections

• Published in: Canadian journal of civil engineering Vol. 48; no. 11; pp. 1508 - 1522
• Main Authors: Iskander, G, Soliman, E, Sayed-Ahmed, E
• Format: Journal Article
• Language: English
• Published: 1840 Woodward Drive, Suite 1, Ottawa, ON K2C 0P7 NRC Research Press 01.11.2021; Canadian Science Publishing NRC Research Press
• Subjects: Analysis; battened columns; Beam-columns; Civil engineering; colonnes combinées; colonnes groupées; colonnes lacées; Columns; combined columns; Defects; Design; Design and construction; Design techniques; Eccentric loads; Finite element method; laced columns; Mathematical analysis; Mathematical models; Mechanical properties; modélisation numérique; Nonlinearity; numerical modelling; Numerical models; Steel beams; Structural dynamics; Testing; Canada
• ISSN: 0315-1468; 1208-6029
• DOI: 10.1139/cjce-2020-0151

Built-up columns composed of two chords present an ideal design for long columns subject to high straining actions. The objective of this paper is to investigate the capacity of built-up columns composed of two-channel sections subjected to eccentric loading and propose a design method for them. A nonlinear numerical finite element model is developed for these columns and verified against experimental investigation available from literature; the model includes both the geometric and material nonlinearities along with the effect of initial imperfections. The model is used to perform a parametric study to investigate the effect of different factors on the built-up columns’ capacity. The results of the parametric study are also used to propose a design method for these columns. A limited experimental investigation is performed on two eccentrically loaded built-up columns, the results of experimental work showed good agreement with the numerical model results and the proposed design method.