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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) 466 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN 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 Since section is larger than before, Pv and d will also be satisfactory \ Adopt 610 ¥ 229 ¥ 125UB However, for a UDL, MLT = 0.925 Table 18 Refer to member capacities section for values of M b directly, noting Steelwork S275 material. Design Guide Vol 1 Value of Mb required is 369 kNm; interpolating for MLT = 0.925 & LE = 7.2 m suggests as possible sections: 533 ¥ 210 ¥ 122 UB M b OK 610 ¥ 229 ¥ 113 UB M b OK Since both are larger than that checked for shear capacity and serviceability deflection in the previous example, either may be adopted. \ Adopt 533 ¥ 210 ¥ 122UB or 610 ¥ 229 ¥ 113UB Grade S275 2
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 kiV A 4,116 D >( 3O,n 3.Onz 3.Om The crossbeams may reasonably be assumed to provide full lateral and torsional restraint at B and C; assume further that ends A and D are similarly restrained. Thus the actual level of transfer of load at B and C (relative to the main beam’s centroid) will have no effect, the lateral-torsional buckling aspects of the design being one of considering the 3 segments AB, BC and CD separately. From Vm statics the BMD and SFD are BMD 406 kNm SFD 135 kN 126 kN Worked examples 467 Subject BEAM EXAMPLE 3 Chapter ref. UNIVERSAL BEAM SUPPORTING POINT LOADS 16 Design code Made by DAN Sheet no. BS 5950: Part 1 Checked by GWO Select a suitable UB section in S275 steel to carry the pair of point loads at the third points transferred by crossbeams as shown in the accompanying sketch. Design to BS 5950: Part 1. 1
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