By Thomas Sputo & Jennifer Turner (editors)
Bracing Cold-Formed metal buildings: A layout consultant records the present practices concerning bracing cold-formed metal constitution parts and platforms. for plenty of engineers the layout of buildings utilizing cold-formed metal is noticeable as a frightening activity. This document seeks to take away a few of the perceived secret via delivering without problems worthwhile details for bracing those buildings. Heavy on purposes and examples, this e-book includes layout examples illustrating bracing layout for varied kinds of cold-formed metal constructions, in addition to an in depth checklist of basic reference assets. This record is gifted as a layout consultant and may support the working towards engineer in designing cold-formed metal buildings with larger degrees of reliability, safeguard, and economic system. themes contain: • creation to Bracing layout • Cold-Formed Framing • Cold-Formed metal in steel development structures • Miscellaneous Cold-Formed metal parts and platforms
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Extra resources for Bracing Cold-Formed Steel Structures
The basis for the bridging design is to limit weak-axis lateral and torsional displacements so that the long-wave buckling design capacity predicted by the unbraced length may be attained. LGSEA Technical Note 559 (LGSEA 200 Ic) provides one method of determining the required lateral brace force demand using the method of discrete bracing found in the Guide to Stability Design Criteria for Metal Structures (Galambos 1998). Where: P= L= n= Axial load in the stud Unbraced length Number of intermediate braces BRACING COLD-FORMED STEEL STRUCTURES Figure 2-8 Stud with Brace Note that as n approaches infinity, 2/n goes to zero.
LGSEA Technical Note 558b-l (LGSEA 1998c) provides current design guidance on the proper application of mechanics to the design of diaphragms. The transfer of shear forces from a roof diaphragm into the shearwalls is a greater concern in cold-formed framed construction than it is in wood-framed construction. 45 46 BRACING COLD-FORMED STEEL STRUCTURES While the mechanics are the same, the rollover resistance of cold-formed steel truss seats is lower than that of an equivalent wood truss. Additionally, wood trasses are initially installed to the wood top plate using (2) 12d common nails, which provide a substantial amount of in-plane force transfer, where these nails are not present with steel trusses.
5. Bridging - Bracing that connects the top chord of one truss to the bottom chord of an adjacent truss. 6. Blocking - A diagonal strap, brake formed shape or truss (Figure 2-12) used to transfer loads from the sheathing or roof deck to the walls below (LGSEA 2002b). Figure 2-12 Blocking Types (LGSEA 2002b) Bracing design is complex and time consuming if the designer is new to bracing design. Not only is the design detailed, but specifications for the design of truss bracing have yet to become standardized making it difficult to know what procedure to follow.