Steel Buildings in Europe

Part 2: Concept Design 2 - 44 5.2.4 Fire protection Beams (typically): Intumescent coating 1,5 mm thick for up to 90 minutes fire resistance Board protection 15-25 mm thick for up to 90 minutes fire resistance Columns (typically): Board protection 15 mm thick for up to 60 minutes fire resistance Board protection 25 mm thick for 90 minutes fire resistance Table 5.1 Sizes of composite secondary beams using IPE or HE sections (S235 steel) in a floor grid Maximum span of secondary beam Rolled steel beam 6 m 7,5 m 9 m 10,5 m 12 m Minimum weight IPE 270A IPE 300 IPE 360 IPE 400 IPE 500 Minimum depth HE 220A HE 240A HE 280A HE 320A HE340B Variable action = 3 kN/m 2 plus 1 kN/m 2 for partitions Slab depth = 130 mm; Beam spacing = 3 m Table 5.2 Maximum spans of composite secondary beams for typical office loading IPE Span (m) HEA Span (m) HEB Span (m) 200 5,0 200 5,8 200 6,7 220 5,6 220 6,5 220 7,7 240 6,2 240 7,3 240 8,6 - - 260 8,0 260 9,3 270 7,0 280 8,7 280 9,9 300 7,9 300 9,6 300 10,9 330 8,4 320 10,3 320 11,6 - - 340 11,3 340 12,3 360 9,4 360 11,9 360 12,9 400 10,4 400 13,1 400 13,8 450 12,2 450 14,2 450 14,7 500 13,6 500 15,1 500 15,6 550 14,7 550 15,9 550 16,4 600 15,7 600 16,6 600 17,1 Variable action = 3 kN/m 2 plus 1 kN/m 2 for partitions Slab depth = 130 mm; Beam spacing = 3 m Table 5.3 Sizes of composite primary beams (S235 steel) in a floor grid Maximum span of primary beam Span of secondary beams 6 m 7,5 m 9 m 10,5 m 12 m 6 m IPE 360 IPE 400 IPE 450 IPE 550 IPE 600R 7,5 m IPE 400 IPE 450 IPE 550 IPE 600R IPE 750  137 9 m IPE 450 IPE 500 IPE 600 IPE 750  137 IPE 750  173 Variable action = 3 kN/m 2 plus 1 kN/m 2 for partitions Slab depth = 130 mm; Beam spacing = 3 m