UK Building Regulations and Supporting Standards Dr David Moore Director of Engineering BCSA

Transcription

1 Russian Delegation, BCSA 26 th Sept 2011 UK Building Regulations and Supporting Standards Dr David Moore Director of Engineering BCSA

2 Content Building Regulations Approved Document A Eurocodes Design guides Execution Standards

3 The Building Regulations 1965

4 The Building Regulations 1965 The building shall be constructed so that the combined dead, imposed and wind loads are sustained and transmitted by it to the ground: a) Safely; and b) Without causing such deflection or deformation of any part of the building, or such movement of the ground as will impair the stability of any part of another building.

5 Approved Document A

6 What are they? EN 1990, Eurocode - Basis of structural design EN 1991, Eurocode 1 - Actions on structures EN 1992, Eurocode 2 - Design of concrete structures EN 1993, Eurocode 3 - Design of steel structures EN 1994, Eurocode 4 - Design of composite steel & concrete structures EN 1995, Eurocode 5 - Design of timber structures EN 1996, Eurocode 6 - Design of masonry structures EN 1997, Eurocode 7 - Geotechnical design EN 1998, Eurocode 8 - Design of structures for earthquake resistance EN 1999, Eurocode 9 - Design of aluminium structures

7 What are they? Each Eurocode has several parts: EN , General & rules for buildings EN , Steel bridges EN , Towers, masts & chimneys EN , Silos, tanks & pipelines EN , Piling EN , Crane supporting structures And each part can have several sub-parts

8 What are they? EN , General rules EN , Fire design EN , Cold-formed EN , Stainless steels EN , Plated structures EN , Shell structures EN , Trans. loaded plates EN , Joints EN , Fatigue EN , Toughness EN , Tension components EN , High strength steels And each sub-part has its own National Annex!

9 What are they? EN 1990 Safety, serviceability and durability EN 1991 Actions on structures EN 1992 EN 1993 EN 1994 Design and detailing EN 1995 EN 1996 EN 1999 EN 1997 EN 1998 Geotechnical and seismic design

10 What are they? Product Standards Designation Materials Elements Testing Design Rules Manufacture Assembly Installation Testing Execution Standards

11 What are they? Published by BSI a) BSI title page b) BSI National Foreword c) EN title page d) EN text e) EN Annex(es) f) BSI National Annex (May be a separate document) NB. The EN parts are reproduced without any alterations a b c d e f

12 What are they? The criticality of the National Annex Allows for differences in: Geography, climatic conditions Level of safety, durability, economy NA contains: Nationally determined parameters Country specific data (e.g. wind maps ) Decisions on application of informative annexes References to NCCI It cannot modify the content of the EN Eurocode text in any way

13 What are they? NCCI Non Contradictory Complementary Information Fills in the gaps in the Eurocodes: Steel NCCI all on www.

14 Why have they been developed? To: Eliminate technical obstacles to trade Harmonise technical specifications Improve functioning of EU market Increase EU competitiveness

15 When will they have to be used? Estimated programme: All Eurocodes & NAs are published BS 5950 etc withdrawn in March 2010 Government policy is still unclear: PPD for public works after 2010 UK Building Regulations? No update of AD A until 2013 BS 5950 still referenced Letter from Secretary of State?

16 How are they different? Code drafting by committee! Cultural changes: Greater use of first principles Greater use of FE analysis Better knowledge of maths Increased number of documents E.g. Steel composite bridge design 5 to BS to Eurocodes

17 How are they different? Principles & Application Rules: Principles: General statements for which there is no alternative Identified by the letter P, & Use the word shall Fundamental requirements Application Rules: Generally recognised rules that comply with the Principles Use words such as should, may, can Alternative rules are permitted (But must offer equivalent safety, serviceability & durability)

18 How are they different? Terminology: Action - load or imposed displacement Verification - check Resistance - capacity (in terms of strength) Execution - construction / fabrication Notation (Subscripts): Ed = design value of effect of actions (e.g. N Ed = axial force) Rd = design value of the resistance (e.g. N Rd = resistance to axial force)

19 How are they different? Member sign convention: As per software packages less potential for error! x-x axis along the member z z z y y y y v u y y z z u z v

20 Where can I find help? From the steel construction industry Involved in drafting the Eurocodes Published ENV guidance documents Involved in drafting the UK NAs Started latest guides over 5 years ago A lot of history A lot of expertise

21 Where can I find help? Initial suite of technical guidance from Corus / BCSA / SCI: Steel Building Design: Introduction to the Eurocodes Concise Eurocodes Design Data Medium Rise Braced Frames Worked examples Open sections Worked examples Hollow sections

22 Where can I find help? Steel Building design: Introduction to the Eurocodes

23 Where can I find help? Steel Building Design: Concise Eurocodes

24 Where can I find help? Steel Building Design: Design Data

25 Where can I find help? Steel Building Design: Medium Rise Braced Frames

26 Where can I find help? Steel Building Design: Worked examples Open sections

27 Where can I find help? Steel Building Design: Worked examples Hollow sections

28 Execution/Fabrication Standards Old Standards BS 5950 Part 2 National Structural Steelwork Specification 5 th ed New European standards BS EN National Structural Steelwork Specification 5 th ed( CE Marking)

29 Principles EN Constructor responsibility Manufacturer s declaration of conformity Warranty that product meets the specification Safety critical products Must have suitable FPC FPC needs to be certified by a Notified Body Linked to Execution Classes [EXC] Welding is a special process Reliance on the system and the personnel Competent welders and inspectors required Competent welding coordinator

30 Scope EN Covers all fabricated steelwork from Purlins to Portal Frames including Bridges Components made from: Hot-rolled steel Cold-formed steel Flat products (plates, sheet and strip) Bars, castings and forgings Applies to: Series production (Purlins, sheets, decking etc) Bespoke structures Components made from kits of parts

31 Execution Classes Execution class is at the heart of: BS EN Execution Class is a design issue Can apply to the whole structure, part of the structure or specific details A single structure may include several Execution Classes

32 Execution Classes Recommendations for determining Execution Class are given in BS EN There are four Execution Classes: Execution Class 1 Lowest Execution Class 2 Execution Class 3 Execution Class 4 Highest

33 Selection of Execution Classes Execution Class should be selected on the following three conditions: The consequence of a structural failure (Consequence Class) The type of loading (Service Category) The processes used for the work and the required quality level of the component (Production Category)

34 Execution Classes Consequence Class CC1 CC2 CC3 Service categories SC1 SC2 SC1 SC2 SC1 SC2 Production categories PC1 EXC1 EXC2 EXC2 EXC3 EXC3 a EXC3 a PC2 EXC2 EXC2 EXC2 EXC3 EXC3 a EXC4 EXC4 should be applied to special structures or structures with extreme consequences of a structural failure as required by national provisions

35 Determination of Execution Classes - Example Example 10 storey office Subject predominantly to static loading S275 steel Some welded components Consequence Class CC2 Service Category SC1 Production Category PC1

36 Execution Classes - Example Consequence Class CC1 CC2 CC3 Service categories SC1 SC2 SC1 SC2 SC1 SC2 Production categories PC1 EXC1 EXC2 EXC2 EXC3 EXC3 a EXC3 a PC2 EXC2 EXC2 EXC2 EXC3 EXC3 a EXC4 EXC4 should be applied to special structures or structures with extreme consequences of a structural failure as required by national provisions

37 Russian Delegation, BCSA 26 th Sept 2011 UK Building Regulations and Supporting Standards Dr David Moore Director of Engineering BCSA