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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 464 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Subject BEAM EXAMPLE 1 Chapter ref. LATERALLY RESTRAINED UNIVERSAL BEAM 16 Design code Made by DAN Sheet no. BS 5950: Part 1 Checked by GWO Check serviceability deflections under imposed load 4 5 ¥ ( 7. 0 ¥ 3. 6) ¥ 7200 d = 4 384 ¥ 205000 ¥ 32400 ¥ 10 2.5.1 = 13. 3mm = span/ 541 From Table 5, limit is span/360 \ d OK \ Use 457 ¥ 152 ¥ 67UB Grade 43 3
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Problem Worked examples 465 Subject BEAM EXAMPLE 2 Chapter ref. LATERALLY UNRESTRAINED UNIVERSAL BEAM 16 Design code Made by DAN Sheet no. BS 5950: Part 1 Checked by GWO For the same loading and support conditions of example 1 select a suitable UB assuming that the member must be designed as laterally unrestrained. It is not now possible to arrange the calculations in such a way that a direct choice is possible; a guess and check approach must be adopted. Try 610 ¥ 229 ¥ 125 UB u = 0.873 ry = 4.98 cm Steelwork Design Guide x = 34.0 Sx = 3680 cm 3 Vol 1 l = LE / ry = 7200 / 49. 8 = 145 l/x = 145/34 = 4.26 1 4.3.7.5 v = 0.85 Table 19 l LT = u v l \ l LT = 0.873 ¥ 0.85 ¥ 145 = 108 P b = 116 N/mm 2 Table 20 M b = Sxpb = 3680 ¥ 10 3 ¥ 116 4.3.7.3 = 427 ¥ 10 6 Nmm = 427kN m > 369kN m OK
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