Guide to the major amendments in BS 5950-1:2000 (SCI by M Heywood

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This has always been the case, but was not made clear in BS 5950-1:1990. However, a 35 P304: Guide to the major amendments in BS 5950-1:2000 Discuss me ... separate member stability check is required for the internal columns of multibay portals and the rafters of tied portals. 4) has been extended significantly to include guidance on members with non-uniform cross sections. It is now stated that the compression flange adjacent to a plastic hinge location should be class 1 plastic for a distance along the member of at least twice the depth of the web or the distance to the point at which the bending moment has fallen to 80% of the plastic moment capacity, whichever is greater.

12. In other respects, the technical content of this Clause is unchanged. Created on 30 March 2011 This material is copyright - all rights reserved. e. the length that cannot deform appreciably in bending) was calculated by taking the angle of load dispersion through the steel to be 45° (see Figure 8 of BS 5950-1:1990). BS 5950-1:2000 also assumes a load dispersion of 45°, but there is no longer a need to analyse the geometry of the section, because b1 may be obtained directly from the formulae given in Figure 13.

2. BS 5950-1:1990 presented three alternative methods of analysis. The first option was to assume that the moment and axial load are resisted by the flanges alone, leaving the web to resist only the shear force. 3. The third method was a combination of the first two. 20 P304: Guide to the major amendments in BS 5950-1:2000 Discuss me ... The methods presented in BS 5950-1:2000 are similar, except that there is now an additional option for low shear. 5. 3 to design the web for the applied shear plus any moment beyond the “flanges only” moment capacity.