Abstract
The finite element model used for analyzing the rotational restraint rigidity of standing seam roof systems was developed. The influences of different factors on the rotational restraint rigidity provided by two types of standing seam roof systems were studied. The variables include local deformation of standing seam roof panels, panel thickness, clip tab thickness, and the relative sliding of clip tab and clip base. The restraint mechanism of standing seam roof systems to the purlins was studied. It is shown that the rotational restraint rigidity provided by the two types of researching standing seam roof systems mainly depends on the slide tab thickness and the roof panel thickness. Finally, formulae for calculating rotational restraint rigidity of the LSIII and SS360 standing seam roof systems were also proposed based on parametric analysis results.
Highlights
Cold-formed purlins are widely used in metal buildings due to their economy, ease of fabrication, and high strength-toweight ratios
In order to accurately calculate the uplift capacity of purlins with top flange through-fastened to roof panels, a series of tests were conducted by several scholars [1,2,3,4,5,6,7,8,9,10,11] to determine the rotational restraint to purlins provided by the purlin-panel systems, and the test set-up and procedure were proposed by Celebi et al [1], improved by Pekoz et al [3], and adopted by Eurocode 3-1-3 [12]
To determine the rotational restraint that sheathing provides to the flange of a cold-formed steel floor joist or stud, a series of cantilever tests on joist/ stud-sheathing assemblies were conducted by Schafer [15, 16]. e tests demonstrated that the rotational stiffness may be decomposed into two parts: connector and sheathing. e connector stiffness was due to the rotation of the fastener in the flange of the cold-formed steel member and was most significantly influenced by the thickness of the cold-formed steel member itself. e sheathing stiffness was due to bending of the sheathing itself and may be highly variable. e results formed the basis for a new design method adopted in American standards (AISI-S210-10) [17] for incorporating restraint into design strength predictions for the distortional buckling mode
Summary
Cold-formed purlins are widely used in metal buildings due to their economy, ease of fabrication, and high strength-toweight ratios. In recent years, standing seam roof systems are very prevalent since they are well adapted to the thermal expansion and contraction deformation caused by temperature changes In these roof systems, standing seam roof panels are fastened to purlins through sliding clips, so that movement of roof panels relative to the purlins is permitted. Liu et al [20] studied the rotational restraint to purlins provided by standing seam roof systems through 28 groups of tests, and it was confirmed that the total rotational rigidity of standing seam roof systems is formed by connecting the rotational rigidity of roof panels, clips, and purlins in series. Us, in this paper, the rotational restraint to purlins provided by two types of standing seam roof systems widely used in China was analyzed using finite element models, and the influence factors were investigated and formulae for calculating rotational restraint rigidity were proposed and verified The rotational restraint rigidity to purlins provided by the LSIII and SS360 standing seam roof systems has not been specially studied. us, in this paper, the rotational restraint to purlins provided by two types of standing seam roof systems widely used in China was analyzed using finite element models, and the influence factors were investigated and formulae for calculating rotational restraint rigidity were proposed and verified
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