TrusSteel - Cold Formed Steel Trusses

Steel Truss Design Manual 2017

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1 2 3 4 5 6 7 8 3.24 FLOOR TRUSS SYSTEMS Bearing Options Multiple bearing options offer the building designer flexibility in assigning bearing elevations and coordinating with other structural systems. While the majority of floor trusses bear directly on the truss bottom chord, top chord bearing can be an option to reduce the overall building height. Mid-height bearing at both exterior and interior beams can eliminate the need for boxed framing and deliver a flat ceiling throughout. Dynamic Response The dynamic response of a TrusSteel open web truss floor system is greatly reduced by requiring the installation of strongback bridging (generally a 5-1/2" cee stud attached to vertical webs) at a maximum of 10'-0" on-center. This load distribution mechanism converts individual truss components into a rigid floor system. Strongback bridging may be attached to the truss web members with standard single shear screws. Deck Connections Whether using a plywood sub-floor in residential framing or metal deck with concrete in commercial construction, deck attachment can be achieved with screws or proprietary ring shank pneumatically installed nails. TrusSteel recommends a minimum steel thickness of 33 mils (20 GA) for the truss top chord in all floor truss applications. The application of acoustical and thermal gasket materials to the top chord can reduce sound and thermal transmission. Strongback splice - overlap one truss as shown. Standard strongback installed on vertical webs. ENGINEERED BY ALPINE S P E C I F Y I N G / D E S I G N I N G

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