Numerical Study of Buckling Behaviour of Cold-formed C-channel Steel Purlin with Perforation☆

Abstract Cold-formed C-channel steel purlins are widely used in construction industry. Since the cost of the steel is the main consideration in design, the concept of introducing web opening has been applied in the construction. A numerical study was undertaken to investigate the lateral-torsional buckling behaviour of cold-formed C-channel purlin with web opening. For this purpose a finite element model was developed using LUSAS software. It was then used in a detailed parametric study to simulate the lateral-torsional buckling and capacity of cold-formed steel purlins under varying perforated conditions. Five different shapes of opening were established to investigate the shape that gives the least reduction in buckling moment. Opening in the form of C-hexagon opening shape was used to develop models with different edge distance, different numbers of openings, different opening spacing and also different size of openings. For 3 m span, 0.5D opening size, where D is 175 mm, 750 mm edge distance with a total number of 13 openings with spacing 125 mm is found to reduce buckling moment by 3.56% but at the same time reducing the volume of the section by 5.16%. For the same span, edge distance, number of openings and spacing with 0.75D opening size, buckling moment reduced significantly by 9.16% while volume reduction by 11.61%. For all different size of openings, spacing and edge distance, the deformation pattern are similar. In conclusion, perforation do affects the buckling moment capacity of the C-channel purlin.

[1]  Benjamin W. Schafer,et al.  Simplified models for cross-section stress demands on C-section purlins in uplift , 2010 .

[2]  Manolis Papadrakakis,et al.  Optimum design of steel structures with web openings , 2008 .

[3]  Haiming Wang,et al.  Experimental and numerical investigation on cold-formed steel C-section flexural members , 2009 .

[4]  Xiao-ting Chu,et al.  Lateral-torsion buckling analysis of partial-laterally restrained thin-walled channel-section beams , 2004 .

[5]  Martin Macdonald,et al.  Investigation of cold-formed steel structural members with perforations of different arrangements subjected to compression loading , 2013 .

[6]  Nirosha Dolamune Kankanamge.  Structural behaviour and design of cold-formed steel beams at elevated temperatures , 2010 .

[8]  Martin Macdonald,et al.  Load capacity of cold-formed column members of lipped channel cross-section with perforations subjected to compression loading – Part I: FE simulation and test results , 2014 .

[9]  K S Sivakumaran,et al.  Flexural strength of cold-formed steel joists with reinforced web openings , 2006 .

[10]  Konstantinos Daniel Tsavdaridis,et al.  Finite element investigation of perforated steel beams with different web opening configurations , 2009 .

[11]  K. S. Sivakumaran.  Some Studies on Cold-formed Steel Sections with Web Openings , 1988 .

[12]  H. Estrada,et al.  Cost Analysis in the Design of Open-Web Castellated Beams , 2006 .

[13]  Long-Yuan Li,et al.  Lateral–torsional buckling of cold-formed zed-purlins partial-laterally restrained by metal sheeting , 2004 .

[14]  Konstantinos Daniel Tsavdaridis,et al.  Vierendeel Bending Study of Perforated Steel Beams with Various Novel Web Opening Shapes through Nonlinear Finite-Element Analyses , 2012 .

[15]  Kwok-Fai Chung,et al.  Steel beams with large web openings of various shapes and sizes: finite element investigation , 2003 .