Steel Buildings in Europe

Part 4: Detailed Design 4 – 52 1 1 Reinforcement in core with concrete infill Figure 6.5 Ties between hollow precast units Special measures may be needed where precast planks are placed on shelf angles, as shown in Figure 6.6. When it is not possible to use reinforcement in the screed, straight reinforcement bars tying the precast units together are usually detailed to pass through holes drilled in the steel beam. 1 1 Reinforcing bar Figure 6.6 Precast units on shelf angles Tying to edge beams Anchorage is best accomplished by exposing the voids in the plank and placing U-shaped bars around studs welded to the steelwork, as shown in Figure 6.7. In this Figure, the studs have been provided in order to achieve adequate anchorage; not for composite design of the edge beam. Figure 6.7b is a more complicated solution involving castellation of the plank edge (often on site) so that the plank fits around the stud and similar U-bars located in the voids prior to concreting. However, this does allow a narrower steel beam to be used. 1 1 2 a) b) 1 U-bar 2 Plank castellated around shear studs Figure 6.7 Tying of precast planks to edge beams Minimum flange width of: (a) 180 mm, (b) 120 mm