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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) 802 Worked examples Subject Chapter ref. No. 3 WEB CLEAT CONNECTION Design code Made by DBM Sheet no. BS 5950 Checked by BD Check 4 – Shear and bearing capacity of supporting beam Shear The basic check is that the shear capacity of the beam (Pv) must be greater than the reaction at the end of the beam (Fv) Pv ≥ Fv For shear the following checks should be considered: • shear capacity of the gross section • shear capacity of the net section • block shear (notched beams only) Shear capacity of the gross section The shear capacity of the gross section is given by the following expression: Pv = 0.6pyAv where py is the design strength of the beam = 275 N/mm2 Av is the shear area The shear area of a rolled I-section is given by: 26 8 4.2.3 Av = tD = 6.9 ¥ 352.0 mm 2 4.2.3 = 24288 mm 2 0. 6 ¥ 275 ¥ 24288 \ Pv= kN 3 10 = 4007. 52 kN 4007.52 kN > 185 kN The shear capacity of the gross section of the beam is adequate. Shear capacity of the net section The effect of bolt holes on the shear capacity of the section need not be considered provided that: A v, net . Av ≥ K 085 e 6.2.3
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) Worked examples 803 Subject Chapter ref. No. 3 WEB CLEAT CONNECTION Design code Made by DBM Sheet no. BS 5950 Checked by BD where Ke is the effective net area coefficient = 1.2 for S275 Av,net is the shear area after deducting bolt holes 3.4.3 Av,net = tD - nDht where n is the number of bolts Dh is the diameter of the bolt hole t is the thickness of the web Av,net = 6.9 ¥ 352 - 4 ¥ 22 ¥ 6.9 = 24288 - 607.2 = 23680.0 mm 2 085 . Av 0. 85 ¥ 24288 = = 17204 mm K 12 . e 23680.0 > 17204 Therefore the effect of bolt holes does not need to be considered. Bearing The basic check for bearing is that the bearing capacity of the beam web per bolt (Pbs) must be greater than the resultant force on the outermost bolt (Fs) P bs ≥ Fs For bearing the following checks should be considered: • bearing capacity of the bolt • bearing capacity of the web Bearing capacity of the bolt The bearing capacity of the bolt is given by the following expression: P bb = d tp pbb where 26 9 6.3.3.2
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