By S J Hicks, R M Lawson
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Extra info for SCI P287: Design of Composite Beams using Precast Concrete Slabs
B. Members with low section factors will heat up more slowly than members with high section factors). For the required fire resistance of the construction, the choice of the type of fire protection that is to be applied to the steel section is established as follows: Spray coating This is applied around the profile, and the section factor for determining the thickness of protection uses the perimeter of the profile, excluding the top flange in contact with the slab. Boards This is applied as a box around the section, and the section factor for determining the thickness of protection uses twice the beam depth plus the width of the bottom flange.
However, in practice, tolerances exist in manufacture and in installation of the units. The minimum bearing distance should not be less than 40 mm, when measured on site. The maximum bearing length of 75 mm is dictated by tolerances on installation and by ease of the later concreting operation (see 2, below). The nominal length of the units should therefore be the distance between the tips of the bottom plate plus 120 mm. , not inter-connected. 2. It may be necessary to chamfer the ends of deeper precast units in order to facilitate: • the installation of the precast units safely • placement of concrete around the Slimflor section (which is required for fire resistance).
95 mm for 19 mm diameter shear connectors. For wide flange beams, it may be possible to place shear connectors in pairs, in which case, their minimum transverse spacing is 4d (or approximately 80 mm for 19 mm diameter studs). 2). For solid planks with shop-welded shear connectors, the minimum width becomes 260 mm for thin planks, and 270 mm for planks of 100 mm depth. 5 Transverse reinforcement Transverse reinforcement should be placed within the depth of the shear connectors so that longitudinal splitting of the concrete is controlled.