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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) 946 Tolerances Table 31.5 (contd ) 9.6.15 Profile Steel Floor Decking Deviation of dimension between deck edge trim and peñmeter beam Actual beam Note: Deviation (as shown) beveen actual beam centre line and intended beam _______________ centre line arises from other permitted tolerances (e.g. 9.6.4) Generic profile deck may span either direction L±1Omm in steps not exceeding the permitted deviation. No more than three layers of shims should be used at any point, and preferably only one or two. The shims (and the lengths of columns) may be held in place by means of a partial penetration butt weld extending over the shims (see Fig. 31.5(a)). In bolted compression splices, bolted ‘finger’ shims (shaped as indicated in Fig. 31.5(b)) can be used. In some cases shims can be driven in, but if so they need to be fairly robust (usually over 2 mm thick), so shims of various thicknesses are needed throughout the joint. Driven shims are best limited to vertical joints e.g. between a beam end plate and a column. More commonly the joint must be jacked or wedged open (or else the upper portion lifted by a crane) so that the shims can be inserted. Tapered shims are particularly difficult to insert; as they are not necessary they are best avoided. 31.5.7 Values for erection tolerances The values for erection tolerances are given in Table 31.5. Each of the specified criteria should be considered and satisfied separately. The permitted deviations should not be considered as cumulative, except to the extent that they are specified relative to points or lines that also have permitted deviation. These values represent current practice and are taken from the fourth edition of the NSSS. ©BCSA
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) Further reading 947 The clause numbers referred to in Table 31.5 are clause numbers in the NSSS, which should be referred to for further information. Further reading for Chapter 31 British Standards Institution (1993) Specification for hot rolled sections. BS 4: Part 1: 1993, BSI, London. British Standards Institution (1993) Specification for hot rolled products of non-alloy structural steels and their technical delivery conditions. BS EN 10025: 1993, BSI, London. British Standards Institution (1986) Equal and unequal angles. BS 4848: Part 4: 1986, BSI, London. British Standards Institution (1990) Guide to accuracy in building. BS 5606: 1990, BSI, London. British Standards Institution (2001) Specification for materials fabrication and erection: hot rolled sections. BS 5950: Part 2: 2001, BSI, London. British Standards Institution (1991) Specification for tolerances and dimensions, shape and mass for hot rolled steel plates 3 mm thick and above. BS EN 10029: 1991, BSI, London. British Standards Institution (1998) Execution of steel structures Part 1: General rules and rules for buildings: DD ENV 1090-1: 1998, BSI, London. The British Constructional Steelwork Association (2002) National structural steelwork specification, 4th edition, BCSA/SCI. Acknowledgement Extracts from the National structural steelwork specification 4th Edition are reproduced with the kind permission of the British Constructional Steelwork Association.
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