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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) 564 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Load factors & combinations: Subject Chapter ref. ROOF TRUSS Design code Made by RT Sheet no. BS 5950: Part 1 Checked by GWO For Dead + Imposed BS 5950: 1.4 ¥ DL + 1.6 ¥ IL Part 1 Table 2 For Dead + Wind 1.0 ¥ DL + 1.4 ¥ WL For Dead + Imposed + Wind not critical as wind loads act in opposite direction to Dead and Imposed loads Member forces (factored) Member Dead + Imposed Dead + Wind kN kN A-B -299.4 66.8 B-C -276.3 69.7 C-D -254.6 67.7 D-E -291.8 78.0 E-F -291.8 81.7 F-G -253.1 76.2 A-a 275.6 -77.2 a-b 275.6 -77.2 b-c 282.4 -87.1 c-d 282.4 -87.1 d-e 273.3 -76.4 e-f 273.3 -76.4 B-a 0 0 C-b 48.3 -8.4 D-c 0 0 E-d -23.6 10.5 F-e 0 0 G-f 70.7 -33.8 B-b -28.1 5.9 b-D -48.6 12.1 D-d 6.5 -2.2 d-F 23.6 -14.7 F-f -43.8 19.9 19 5
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 Member Design: (A) Top Chord – member A-B Subject Chapter ref. ROOF TRUSS Design code Made by RT Sheet no. BS 5950: Part 1 Maximum compressive force = 299.4 kN Checked by GWO Worked examples 565 Effective length L E = 1.0 L = 2311 mm Table 22 Try 90 ¥ 90 ¥ 5RHS S275 l = LE ry = = 66. 8 p y = 275 N/mm 2 pc = 228 N/mm 2 19 6 Table 24(a) Allowable compressive force P c = AgPc 4.7.4 A g = 16.9 cm 2 2311 34. 6 Pc = 16.9 ¥ 10 2 ¥ 228 ¥ 10 -3 � Use 90 ¥ 90 ¥ 5 RHS Grade 43 (B) Bottom Chord – Member b-c Maximum tensile force = 282.4 kN Maximum compressive force = 87.1 kN For welded connections allowable tensile force, P t = 385 kN > 299.4 kN OK Pt = AePy Ae = gross area in this case Assume the same size section as the top chord � Try 90 ¥ 90 ¥ 5 RHS Grade 43 Allowable tensile force = 16.9 ¥ 10 2 ¥ 275 ¥ 10 -3 = 464.8 kN > 282.4 kN OK 4.6.1
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