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Full letter here [PDF] For now we hope that Building Control checking engineers will continue to accept the use of BS for structures such as loft conversions that involve an intimate mix of steel and timber structural elements, and not unreasonable to use this code for simple steelwork calculations in domestic scale structures.
For other work we would agree that BS, on which our ProSteel program is based, is the better code to use.
As familiarity with Eurocodes builds it will become increasingly possible to use them with confidence. Note in particular that for unrestrained steel beams EC3 often shows a much higher resistance to lateral torsional buckling than the earlier codes; since the steel has got no stronger, the Eurocode approach is delivering a lower factor of safety but hopefully still adequate than the older codes, so using them is not risking building safety, rather the opposite.
Implementation of Eurocodes changes The proposed changes to Approved Document A are intended to come into force in As the Impact Assessment accompanying this consultation document recognises, there are one-off, transitional costs to business associated with a move to a structural design approach based on the Eurocodes.
A proportion of industry has already incurred this cost wholly or to some extent. However, a significant proportion of industry has not and Government accepts that many of the firms that might potentially be impacted upon are smaller businesses.
It is important to remember, however, that the proposed Eurocodes-related changes affect only the guidance contained in the Approved Document and not the functional requirements contained in the Building Regulations themselves. Further, the functional nature of the Building Regulations means that this guidance does not necessarily need to be followed, that is, alternative approaches may well be acceptable, subject to them being shown to satisfy the functional requirements of the Regulations.
In order to ensure this flexibility of approach is properly understood by business and building control bodies, we therefore propose to supplement guidance in the Approved Document with additional advice, perhaps through an accompanying Circular with the final changes, that clarifies: that until withdrawn British Standards become significantly outdated, probably some time after , use of currently-referenced structural design standards could still be used to demonstrate compliance with the Building Regulations that beyond use of these withdrawn standards may in some circumstances still be acceptable and that building control bodies should accept an approach where a designer is able to demonstrate it is appropriate for the particular building structure proposed.
This is likely to be particularly appropriate for smaller-scale building development.
This will assist business, and small firms in particular, in two ways. Firstly, it will provide at least an additional two years for firms to prepare for, and spread the costs over, the switch to a regime based on Eurocodes-based structural design.
Secondly, it will also allow certain types of firm, principally those very small firms whose work is made up of smaller-scale buildings in the domestic sector, to continue to use the currently referenced withdrawn British Standards, thereby avoiding the additional costs associated with a switch to Eurocodes-based British Standards. As expected, Eurocodes are now the codes listed for structural design. To quote the DCLG's circular letter of 30 July The main change to Approved Document A Structure has been updating of the references to structural design standards, so these refer to the current British Standards for structural design, replacing references to standards withdrawn by the British Standards Institution BSi on 31 March The current British Standards are based on a suite of common European design standards, the Eurocodes, which provide a unified approach to structural design across the European Union.
Fabrication and erection55 Inspection 53 H.
Work off site56 Straightness Clearances Cutting Holing Assembly Riveting Bolting Welding Qualification and testing of welders Flattened ends of tubes Machining of butts, caps and bases Slab bases and caps Solid round steel columns Marking Painting 55 J. Work on site71 Plant and equipment Storing and handling Setting out Security during erection Painting after erection Bedding of stanchion bases, bedding and encasing of grillage beams and bearings of beams and girders 56 Chapter 6.
It was reset and reprinted in February incorporating amendments Nos. When a programme of Codes of Practice for Buildings was drawn up in under the aegis of the Ministry of Works, a Code of Practice for the structural use of steel in buildings was included in a series for all types of building construction: this was later issued as CP Much of the information given in BS and in CP was the same and with the formation of the Codes of Practice Council within BSI it was decided that the two documents should be amalgamated and issued as a single publication under the main reference BS Part 2 of this standard has been prepared, in accordance with the change to the metric system in the construction industry, giving values in terms of SI units.
The values given in Part 2 represent the equivalents of the values in imperial units in BS , rounded to convenient numbers. Although the values are not exact equivalents of the imperial ones, Part 2 does not constitute a technical revision of the standard and is substantially similar in content to BS Amendment Slip No. This amendment slip also noted the future insertion of grade 55 steel.
Part 2 has now been expanded to include the use of this steel, and also includes an amendment to Subclause 3 a. This subclause on brittle fracture has now been further extended to be in parity with BS Because of the extent of the amendments made necessary by the publication of BS it has been found more practical to reissue the imperial edition of this standard incorporating these amendments rather than to publish a further amendment slip.
For the purpose of compliance with this standard designers may use the values given in either BS or this part, provided that one set of values is used consistently throughout the design of each part of a structure.
A revision of this standard is currently in hand and the revised standard will be written in terms of SI units only.
Users of this British Standard should satisfy themselves that effective compliance is secured with local bye-laws and regulations and, for insurance purposes, with any requirements of insurance companies. The attention of users is also called to the importance of making provision, where necessary, for water, gas, electricity and other services, having particular regard to condition 5 in Clause 21 for cased beams and to condition 4 in Subclause 30 b for cased struts.
This standard reflects the revised increased yield strength of grade 43 steels included in BS It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people, for whose guidance it has been prepared, and that construction and supervision is carried out by capable and experienced organizations.
BS vi BSI Economy in designThis British Standard stipulates limits of stress and gives rules for design, with the twofold purpose of ensuring normal safety and economy in the use of structural steel. While the stresses and other requirements are to be regarded as limiting values, the purpose in design should be to reach these limits in as many parts of the structure as possible and to adopt a layout such that maximum structural efficiency is attained for a minimum use of steel.
Careful consideration should therefore be given to the semi-rigid basis and fully rigid basis of design.