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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) Information on assemblies of matching bolts, nuts and washers is given is BS 5950-2. [1] (1) Non-preloaded bolts, Ordinary (Grades 4.6, 8.8 and 10.9) and HSFG (General and Higher Grade): (a) The tensile stress area (At) is obtained from the above standards. (b) The tension capacity of the bolt is given by: Pnom = 0.8ptAt Nominal 6.3.4.2 Pt = ptAt Exact 6.3.4.3 where pt is the tension strength of the bolt. Table 34 (c) The shear capacity of the bolt is given by: Ps = psAs 6.3.2.1 where ps is the shear strength of the bolt Table 30 As is the shear area of the bolt. In the tables, As has been taken as equal to At. The shear capacity given in the tables must be reduced for large packings, large grip lengths, kidney shaped slots or long joints when applicable. (d) The effective bearing capacity given is the lesser of the bearing capacity of the bolt given by: 6.3.2.2 6.3.2.3 6.3.2.4 6.3.2.5 Pbb = dtppbb and the bearing capacity of the connected ply given by: Pbs = kbsdtppbs assuming that the end distance is greater than or equal to twice the bolt diameter to meet the requirement that Pbs £ 0.5 kbsetppbs Bolts and welds 1161 6.3.3.2 6.3.3.3 where d is the nominal diameter of the bolt tp is the thickness of the ply. For countersunk bolts, tp is taken as the ply thickness minus half the depth of countersinking. Depth of countersinking is taken as half the bolt diameter based on a 90° countersink. 6.3.3.2 pbb is the bearing strength of the bolt Table 31 pbs is the bearing strength of the ply Table 32
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) 1162 Bolts and welds e is the end distance kbs is a coefficient to allow for hole type. 6.3.3.3 Tables assume standard clearance holes, therefore kbs is taken as 1.0. For oversize holes and short slots, kbs = 0.7. For long slots and kidney shaped slots, kbs = 0.5. (2) Preloaded HSFG bolts (general grade and higher grade): 6.4 (a) The proof load of the bolt (Po) is obtained from BS 4604. [19] The same proof load is used for countersunk bolts as for non-countersunk bolts. For this to be acceptable the head dimensions must be as specified in BS 4933. [20] (b) The tension capacity (Pt) of the bolt is taken as: 6.4.5 1.1 Po for non-slip in service 0.9 Po for non-slip under factored load (c) The slip resistance of the bolt is given by: 6.4.2 PSL = 1.1 KsmPo for non-slip in service PSL = 0.9 KsmPo for non-slip under factored load where Ks is taken as 1.0 for fasteners in standard clearance holes 6.4.2 m is the slip factor. Table 35 (d) The bearing resistance is only applicable for non-slip in service and is taken as: Pbg = 1.5 dtppbs assuming that the end distance is greater than or equal to three times the bolt diameter, to meet the requirement that Pbg £ 0.5 etppbs. where d is the nominal diameter of the bolt tp is the thickness of the ply 6.4.4 pbs is the bearing strength of the ply. Table 32 (e) The shear capacity of the bolt is given by: 6.4.1(a) Ps = psAs 6.3.2.1 where ps is the shear strength of the bolt Table 30 As is the shear area of the bolt In the tables, As has been taken as equal to At.
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