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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) 560 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Problem Subject Chapter ref. ROOF TRUSS Design code Made by RT Sheet no. BS 5950: Part 1 Checked by GWO Design the roof trusses for an industrial building with two 25 m spans, 120 m long. The roofing is insulated metal sheeting with purlins at node positions. The building is 9 m to the eaves. Structural form: For 25 m span a pitched roof will not be economical as the height at the apex would be in the order of 5.5 m. Ideal solutions would either be a Mansard truss or a parallel chord Pratt, Howe or Warren truss. For the prupose of this design example a Mansard truss will be adopted. Economical span to depth ratio beteween 7 and 8 For 3.5 m depth span depth Truss spacing should be in the region of 1/4 to 1/5th of the span For 6 m truss centres = = 25 35 . 714 . acceptable spacing/span = 6/25 = 1/4.17 acceptable A truss spacing of 6 m conveniently suits the length of the building. 19 1
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 Number of bays = 120/6 = 20 No. Truss dimensioning: Subject Chapter ref. ROOF TRUSS Design code Made by RT Sheet no. BS 5950: Part 1 12 equal bays 25000 Checked by GWO Worked examples 561 Loading: kN/m 2 BS 648 Dead load – Steel sheeting = 0.075 for 6 m bays Insulation = 0.020 Fixings = 0.025 Services etc = 0.100 Total = 0.22 ——— — Roof dead load = 0.22 ¥ 25 ¥ 6 = 33.0 kN Allow for purlins = 11.8 kN kN/m 2 Allow for own weight = 30.0 kN Total load = 74.8 — kN —— 74. 8 nodal load = = 6.2 kN 12 19 2
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