Steel Buildings in Europe

Part 2: Concept Design 2 - 33 by using long span composite slabs and pr imary beams directly attached to the columns. 130 450 450 - 600 300 - 450 9 - 15 m 6 - 9 m Figure 4.7 Typical long span secondary beams (span of slab is indicated) 130 300 2400 500 - 700 600 - 900 9 - 15 m 6 - 9 m Figure 4.8 Typical long span primary beams and shorter span secondary beams (span of slab is indicated) Integrated b eams are a special case in which beam s span directly be tween columns and secondary beam s are eliminated. These beams are generally used in square grids, as illustrated in Figure 4.9. The slab is supported by the bottom flange or extended bottom plate of the b eam and may be in the form of a deep composite slab or a hollow core concrete slab.