BEHAVIOR AND DESIGN OF AXIALLY LOADED BUILT-UP COLD-FORMED STEEL LACED COLUMNS | ||||
| International Journal of Advances in Structural and Geotechnical Engineering | ||||
| Volume 04, Issue 01, February 2020, Page 115-125 PDF (628.22 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/asge.2020.271122 | ||||
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| Abstract | ||||
| This paper presents a nonlinear 3-D finite element model highlighting the structural performance and strength of built-up cold-formed steel section laced columns. The pin-ended columns were axially loaded and consisted of two cold-formed steel (CFS) channels placed back-to-back at different center-to-center distances. The built-up columns had different geometries and different slenderness ratios. The nonlinear material properties of cold-formed steel, initial geometric imperfections and built-up section column components were considered in the finite element models. The finite element models were verified against tests conducted on built-up laced and battened columns collected from the literature. The column strengths, load-axial shortening, deformed shapes at failure, failure modes, load-axial shortening, load-lateral displacement and load-axial strain relationships were predicted from the finite element analysis and compared well against the test results. The verified finite element model was used to perform parametric studies investigating the effects of different parameters affecting the built-up column strength and behavior. The column strengths predicted numerically were compared with design strengths calculated using current codes of practice. The column strengths measured in the parametric study were compared against design strengths calculated using the North American Specification, Australian/New Zealand Standard and European Code for cold- formed steel columns. | ||||
| Keywords | ||||
| Built-up; Laced column; Finite element; Design strength; Buckling | ||||
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