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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