6.7 -Transverse reinforcement for composite beams

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Transverse reinforcement is required in the concrete flange of composite beams to resist splitting forces. This will usually be in the form of mesh and/or additional bars running perpendicular to the beam centre line. In locations where the decking spans perpendicular to the beam centre line, the deck can also be considered, providing it is either continuous across the beam flange or securely anchored with thru-deck welded studs at butt joints. Where the deck is considered as transverse reinforcement at butt joints in the deck sheets, the shear studs should be welded a minimum of 30mm from the end of the sheet and 30mm from the toe of the beam, resulting in a minimum bearing required of 120mm – Refer to Fig 6.6e (based on TR+ profiles, but similar detail applies for all floor deck products).


For beams where the deck spans parallel to the beam centre line, it is recommended to neglect any contribution of deck to the transverse reinforcement requirement as this can introduce impractical limits on sheet lap positions and flashings in deck sheets.


Perimeter beams designed as composite may require additional 'U' bars depending on the slab edge dimension, refer BS EN 1994-1-1 (Clause 6.6.5.3) or BS5950-3 Section 3.1:1990+A1 2010 (Clause 5.6.5)


SCI P300 REVISED EDITION. Composite slabs and beams using steel decking: Best practice for design and construction




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