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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) 790 Worked examples Subject Chapter ref. No. 2 FIN PLATE CONNECTION Design code Made by DBM Sheet no. BS 5950 Checked by BD Check 8 – Structural integrity – connecting elements The basic requirement is that the tension capacity of the fin plate must be greater than the tie force. Tension capacity of fin plate ≥ Tie force Tie force The minimum tying force is 75 kN. 2.4.5.3 Note that in certain cases the tie force will be greater than 75 kN and it may be necessary to check for a tying force equal to the end reaction of the supported beam. Tension capacity of fin plate The following two checks should be considered: • capacity of gross section • capacity of net section Capacity of the gross section The tension capacity of the gross section is given by: Pt = pyAe py = 275 N/mm 2 26 15 4.6.1 At the gross section an is given by the following expression: 3.4.3 an = ag = L ¥ tf = 320 ¥ 10 = 3200 mm 2 275 ¥ 3200 Pt = kN 1000 = 880 kN Capacity of net section The tension capacity of the net section is given by: Pt = pyAe 4.6.1 Ae = kean 3.4.3 ke = 1.2 an = A - nDh = 3200 - 4 ¥ 22 = 3112 mm 3.4.4.1 2
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) 275 ¥ 1. 2 ¥ 3112 \ Pt= kN 1000 = 1026. 9 kN The tension capacity of the fin plate is 880 kN. 880 kN > 75 kN Worked examples 791 Subject Chapter ref. No. 2 FIN PLATE CONNECTION Design code Made by DBM Sheet no. BS 5950 Checked by BD Therefore the tension capacity of the fin plate is adequate. Bearing capacity The bearing capacity of each bolt hole is given by: but P bs = k bsdt fp bs P bs £ 0.5k bset fp bs 26 16 6.3.3.3 kbs = 1.0 d = 20 mm tf = 10 mm pbs = 460 N/mm2 (S275) Table 32 e = 50 mm 1. 0 ¥ 20 ¥ 10 ¥ 460 \ Pbs £ kN 1000 = 92 kN but 0. 5 ¥ 1. 0 ¥ 50 ¥ 10 ¥ 460 Pbs £ kN 1000 = 115 kN Capacity of fin plate = npbs = 4 ¥ 92 kN = 360kN 360kN > 75kN \ The bearing capacity of the fin plate is adequate.
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