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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) BS 5950: Part 1: 2000: Section three Table 9. Design strength py Extracts from BS 5950: Part 1 1221 Steel grade Thickness a less than or equal to Design strength py mm N/mm 2 S 275 16 275 40 265 63 255 80 245 100 235 150 225 S 355 16 355 40 345 63 335 80 325 100 315 150 295 S 460 16 460 40 440 63 430 80 410 100 400 a For rolled sections, use the specified thickness of the thickest element of the cross-section.
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) 1222 Extracts from BS 5950: Part 1 BS 5950: Part 1: 2000: Section three Table 11. Limiting width-to-thickness ratios for sections other than CHS and RHS Compression element Ratio a Limiting value b Class 1 Class 2 Class 3 plastic compact semi-compact Outstand element of Rolled section b/T 9e 10e 15e compression flange Welded section b/T 8e 9e 13e Internal element of Compression due b/T 28e 32e 40e compression flange to bending Axial compression b/T Not applicable Web of an I-, Neutral axis at mid-depth d/t 80e 100e 120e H- or box Generallyd section If r1 is negative: d/t c If r1 is positive: d/t but ≥40e but ≥40e but ≥40e Axial compressiond 100e 1+ r1 80e 100e 120e 1+ r1 1+ 1. 5r1 1+ 2r2 d/t Not applicable Web of a channel d/t 40e 40e 40e Angle, compression due to bending b/t 9e 10e 15e (Both criteria should be satisfied) d/t 9e 10e 15e Single angle, or double angles with the b/t 15e components separated, axial compression d/t Not applicable 15e (All three criteria should be satisfied) (b + d)/t 24e Outstand leg of an angle in contact back-to-back b/t 9e 10e 15e in a double angle member Outstand leg of an angle with its back in continuous contact with another component Stem of a T-section, rolled or cut from a rolled D/t 8e 9e 18e I- or H-section a Dimensions b, D, d, T and t are as defined in Figure 5 of BS 5950-1. For a box section b and T are flange dimensions and d and t are web dimensions, where the distinction between webs and flanges depends upon whether the box section is bent about its major axis or its minor axis: see clause 3.5.1. b The parameter e = (275/py) 0.5 . c For the web of a hybrid section e should be based on the design strength pyf of the flanges. d The stress ratios r1 and r2 are defined in clause 3.5.5.
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