Shear Bracing A Freestanding Roof System

And carried through to more recent versions is the use of blocking panels between roof trusses to connect the trusses to the braced wall panels below if the heel height is greater than 9.

Shear bracing a freestanding roof system.

The shear wall design guide published by the steel framing alliance in 1998 publication rg 9804 included dia gonal strap bracing as one of the lateral systems investigated. And 2 the re quired strength of bracing members. The latest addition to the strong wall family is our new strong wall site built portal frame system pfs. To ensure properly controlled ductility in the system.

Steel bracings can be used to strengthen or to retrofit the existing structure. For trusses with heel heights less than 15 this blocking can be made of solid sawn dimensional lumber as shown in figure 1a. The pfs is a kit of parts that provides designers engineers and builders in prescriptive markets with an easy way to meet code required wall bracing requirements for garage portal frames or other wide openings. The provision of bracing enhances the bases hear carrying capacity of frames and reduces roof displacement undergone by the structures.

Performances of the frames are carried out the parameters such as base shear roof displacement and the number of hinges formed. The design of bracing members entails two considerations.