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Steel Designers' Manual - 6th Edition (2003)
to direct compression or tension. In BS 5950-1: 2000 this rule has been deleted, and
designers must use the design strengths given in Table 24.2. These values are significantly
lower than the design strengths of the parent material (pw = 220 N/mm 2 for
S275 and pw = 250 N/mm 2 for S355). This reduction in capacity has been partly offset
by the allowance in BS 5950-1: 2000 for the higher transverse strength of fillet welds,
which may be taken into account using the directional method when determining
the weld capacity (see clause 6.8.7.3). For the case of two plates connected at right
angles by symmetrical welds, transverse strengths of 1.25 ¥ 220 = 275 N/mm 2 and
1.25 ¥ 250 = 312.5 N/mm 2 are achieved for grade S275 and S355 respectively. Clearly,
where S275 steel is used, the transverse strength is still equal to that of the parent
metal, but for S355 the strength is significantly lower.
The Appendix Capacities of fillet welds shows fillet weld capacities using appropriate
strengths for S275 and S355 steel.
References to Chapter 24
References 709
1. British Standards Institution (1993) Structural steels with improved atmospheric
corrosion resistance. BS EN 10155, BSI, London.
2. British Standards Institution (2000) Structural use of steelwork in building. Code
of practice for design – rolled and welded sections. BS5950-1, BSI, London.
3. British Standards Institution (2000) Steel, concrete and composite bridges. Code
of practice for design of steel bridges. BS5400-3, BSI, London.
4. British Standards Institution (2001) Welding. Recommendations for welding of
metallic materials. Arc welding of ferritic steels. BS EN 1011-2, BSI, London.
5. British Standards Institution (1995) Welded, brazed and soldered joints. Symbolic
representation on drawings. BS EN 22553, BSI, London.
6. British Standards Institution (1994) Specification for metal-arc welding with
covered electrode, gas-shielded metal-arc welding and gas welding. Joint preparation
for steel. BS EN 29692, BSI, London.
7. British Standards Institution (1993) Hot rolled products of non-alloy structural
steels. BS EN 10025, BSI, London.
8. British Standards Institution (1993) Hot rolled products in weldable fine grained
structural steels. BS EN 10113, BSI, London.
9. British Standards Institution (1996) Plates and wide flats made of high strength
structural steels in the quenched and tempered or precipitation hardened conditions.
BS EN 10137, BSI, London.
10. British Standards Institution (1994) Hot finished structural hollow sections of
non-alloy and fine grain structural steels. BS EN 10210, BSI, London.
11. British Standards Institution (1997) Cold formed structural hollow sections of
non-alloy and fine grain structural steels. BS EN 10219, BSI, London.
12. British Standards Institution (1994) Specification for weldable structural steels –
Hot finished structural steels in weather resistant steels. BS 7668, BSI, London.
13. British Standards Institution (1995) Welding consumables. Wire electrodes and