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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 2c+t D Worked examples 837 Subject Chapter ref. FOUNDATION EXAMPLE 12 Design code Made by HB HB Sheet no. BS5950: BS 5950: Part Part 1 Checked by GWO GWO Design a simple base plate for a 219 ¥ 6.3 CHS to carry a factored axial load of 1010 kN Design by the effective area method 4.13.2 Area of shaded annulus = (2c + t) (D - t) p = 42083 (2c + 6.3) (219 - 6.3) = 13395, hence c = 28.3 mm 05 . tp = ¥ È 3¥ 24 28. 3 ˘ = 14. 62 mm ÎÍ 270 ˚˙ 219 ¥ 6.3 CHS 3 1010 ¥ 10 Area required = = 42083mm 06 . ¥ 40 27 1 Factored axial load = 1010 kN Assumed bedding material f cu = 40 N/mm 2 \ Use 280 ¥ 280 ¥ 15 plate 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) 838 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Problem Subject Chapter ref. FOUNDATION EXAMPLE 13 Design code Made by HB Sheet no. BS5950: BS 5950: Part Part 1 Checked by GWO Design a simple base plate for a 273 ¥ 25 CHS to carry a factored axial load of 6340 kN Strength of bedding material = 40 N/mm 2 3 6340 ¥ 10 Area required = = 264167 mm 06 . ¥ 40 Design by the effective area method 4.13.2 (2c + 25) (273 - 25) p = 264167 from which c = 157 mm D - 2t When c > 2 the bearing area is a circle of (D + 2c) diameter. Then: (D + 2c) 2 (273 + 2c) 2 p 4 = 264167 = 336348 4c 2 + 1092c + 74529 = 336348 c t p = = = = 2 - 1092 ± 1092 - 16 ¥ ( -261819) 8 153 mm È 3 ¥ 24 153 ˘ ÎÍ 270 ˚˙ 79 mm [ ] 05 . 05 . \ Use 600 ¥ 600 ¥ 80 plate 2 27 1 4.13.2.2
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