Sheet1Carriageway = 6.0m wideDeck span = 4.6m (centre to centre of wall support for a simply supported single span)Design for a metre width of deck :Cl. 3.2.9.3.1.Number of notional lanes = 2Notional lane width = 6/2 =3mCl. 6.2.1.Loaded length =4.6mW = 336(1/L)0.67 kN/m (per notional lane)W =120.86kN/mW = 31.6 kN/m (per notional lane)Cl. 6.2.2.Knife Edge Load = 120 kN (per notional lane)Cl. 6.4.1.1.2 = 0.0137[bL(40-L)+3.65(L-20)]2 = 0.0137[3.00 x (40-4.6)+3.65 x (4.6-20)] =a2 =0.685Note: For loaded lengths less than 20m the load is proportioned to a standard lane width of 3.65m, i.e. 0.274bL = bL/3.65.For a metre width of deck :W = (120.86 x 0.685)/3.65 =W =22.7kN/mKEL = (120 x 0.685)/3.65 =KEL=22.52kN/mCl. 6.2.7.fL = 1.50 (Ultimate limit state - combination 1)Design HA loading for a metre width of deck :W = 1.5 x 22.7 = 34.05 kN/mKEL = 1.5 x 22.52 = 33.8 kNMaximum mid span Bending Moment with KEL at mid span = MultMult = (34.05 x4.62)/8 + (33.8 x 4.6)/4Mult = 128.93 kNmNote: Use of f3BS 5400 Pt.3 & Pt.5 - f3 is used with the design strength so Mult = 2300 kNm.BS 5400 Pt.4 - f3 is used with the load effect so Mult = 1.1 x 2300 = 2530 kNm.

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