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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) 762 Design of connections tw is the thickness of the column or beam web py is the design strength of the steel in the column or beam 26.3.2.2 Compression zone The checks in the compression zone are similar to those traditionally adopted for web bearing and buckling and include the following: • Column web in bearing • Column web buckling • Beam flange in compression Column web in compression In many designs it is common for the column web to be loaded to such an extent that it governs the design of the connection. However, this can be avoided either by choosing a heavier column or by strengthening the web with one of the compression stiffeners shown in section 26.3.2.4. The resistance of an unstiffened column web subject to compressive forces, Pc,is given by the smaller of the expressions for column web bearing and column web buckling. Column web bearing The resistance of the column web to bearing is based on an area of web calculated by assuming the compression force from the beam’s flange is dispersed over a length shown in Fig. 26.29. From this the resistance of the column web to crushing is given by the following expression: P = ( b + nk)¥ t ¥ p bw 1 c yw where b1 is the stiff bearing length based on a 45° dispersion through the end-plate from the edge of the welds n except at the end of a member n = 5 k is obtained as follows: – for a rolled I- or H-section k = Tc + r – for a welded I- or H-section k = Tc Tc is the column flange thickness r is the root radius tc is the thickness of the column web pyw is the design strength of the column web
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) Column web buckling a- + N) j4 a- ____ Fig. 26.29 Distribution of compressive force Moment connections 763 The resistance of the column web to buckling is based on bearing capacity of the column web and is given by the following expression in clause 4.5.3.1 of BS 5950: Part 1: P x 25e tc = ( b + nk)¥ d [ ] 1 where b 1, n, k and t are defined above d is the depth of the web P bw is the bearing capacity of the unstiffened web at the web-to-flange connection given in the section above. P = min ( P , P ) c bw x 05 . P bw Beam flange in compression Two approaches are presented for checking the resistance of the beam flange in compression. In the first method it is assumed that only the compression flange carries the compression in the beam and that the centre of compression acts at the centre of this flange. In the second approach the compression zone is allowed to spread up the beam and into the beam web. In this method the centre of compression will move towards the web. This latter approach is usually used in cases with either high moments or combined high moment and axial load.
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