By Thomas Sputo & Jennifer Turner (editors)
Bracing Cold-Formed metal constructions: A layout consultant files the present practices relating to bracing cold-formed metal constitution components and platforms. for plenty of engineers the layout of buildings utilizing cold-formed metal is obvious as a frightening job. This file seeks to take away a number of the perceived secret through delivering with ease worthwhile info for bracing those constructions. Heavy on purposes and examples, this publication includes layout examples illustrating bracing layout for numerous different types of cold-formed metal buildings, in addition to an intensive checklist of basic reference assets. This document is gifted as a layout consultant and may help the training engineer in designing cold-formed metal buildings with larger degrees of reliability, defense, and economic system. subject matters contain: • advent to Bracing layout • Cold-Formed Framing • Cold-Formed metal in steel development platforms • Miscellaneous Cold-Formed metal parts and platforms
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Extra info for Bracing Cold-Formed Steel Structures
For a truss spacing no greater than 24 inches on-center, structural sheathing attached directly to the top chord and gypsum board sheathing attached directly to the bottom chord will typically provide adequate lateral support. Examples of structural sheathing include plywood, corrugated metal deck, or any rigid system that is delivered in sheets and directly attached to the truss top chord. Standing seam roofs typically do not provide sufficient lateral bracing of the top chord (LGSEA 2004). If the trusses are spaced greater than 24 inches on-center or if structural sheathing is not used, purlins need to be designed to provide lateral bracing for the roof.
1 Introduction Currently the use of cold-formed roof trusses is increasing. One reason for this increased is the development of custom truss web and chord profiles. Also, the specification of steel trusses has become very similar to wood trusses (Allen 2004). 2 Cold Formed Truss Bracing Truss bracing is required for two general purposes. First, it is used to hold the truss upright, straight and in place, and second, to transfer loads through the structure. Truss bracing that is used to provide temporary stability to the trusses during construction is referred to as erection, construction, or temporary bracing.
Because of possible failure of the purlins or the girts due to wind uplift or increased gravity loads due to snow or ponding, it is essential that lateral bracing be provided to ensure stability of C or Z sections. Figure 3-1 Gravity Load not Concentric with Shear Center Figure 3-2 Purlin "Rolling" under Gravity Load BRACING COLD-FORMED STEEL STRUCTURES Purlins and girts may be braced by a through-fastened metal roof or by installing angles or flat straps that run between eaves and attach to each purlin and eave girt, as shown in Figures 3-3 and 3-4.
Bracing Cold-Formed Steel Structures by Thomas Sputo & Jennifer Turner (editors)
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