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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) The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Problem 0.2 in -4- -+- I 12 mm gusset /plate 0.5 m L 1.2 m 828 kN 350 kN Ehk 1.5m 0.2 m 0.Sm — I Worked examples 839 Subject Chapter ref. FOUNDATION EXAMPLE 14 Design code Made by HB HB Sheet no. BS5950: BS 5950: Part Part 1 Checked by GWO GWO Design a built-up base for the valley stanchion of a double bay crane shed that is shown belon. The stanchion comprises twin 406 ¥ 178 UB. Taking moments about the tensile bolt, with n, the trial neutral axis as 0.4 m depth, and taking 2 2 f = 0. 6 f = 12 N/ mm ( assumin g f = 20 N/ mm ) c cu cu Loading 828 ¥ 1.5 - 350 ¥ 0.3 = C (2.0 - 0.2) 828 ¥ 1. 5 - 350 ¥ 0. 3 C = = 632 kN 18 . 100 430 100 27 1 4.13.1
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) 840 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN 3 632 ¥ 10 fc = = 263 . N/ mm 6 04 . ¥ 06 . ¥ 10 Subject Chapter ref. FOUNDATION EXAMPLE 14 Design code Made by HB Sheet no. BS5950: BS 5950: Part Part 1 Checked by GWO Taking n as 0.2 m, C becomes 598 kN and fc is 4.98 N/mm 2 T is then: 598 + 350 - 828 = 120 kN To check, take moments about C 828 ¥ 0. 4 - 350 ¥ 1. 6 19 . The relative stiffness of the base plate and channels will determine the point of application of the compressive force. As an alternative therefore assume the lever arm to be equal to the bolt centres and the centre of compression at the bolt line with appropriate stiffening added at this point. C = 828 ¥ 1. 5 - 350 ¥ 0. 3 17 . = 669 kN T = 669 + 350 - 828 = 191kN n = 3 669 ¥ 10 2 630 ¥ 12 N/ mm = 88 mm This is the minimum value of n for concrete strength of 20 N/mm 2 . Design of channels & gusset 120. 4 kN M = 669 ¥ 300/10 3 = 200.7 kNm Use 2/229 ¥ 89 ¥ 32.76 RSCs, M cx = 95 kNm = These are satisfactory by inspection since the gussets and base plate acting compositely would also make a contribution. The internal stiffener and base plate would similarly be designed as a composite member taking the maximum outstand given in Table 11 of BS 5950. 2 27 12
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