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PD6547:2004 + A1:2009, Guidance on the use of BS EN 40-3-1 and BS EN 40-3-3 Corrections.
For some while it has been known that there are errors within the current PD6547 document. The proposal has been to correct these when the document comes up for review but at the last review this opportunity was lost. Since then there has been desire to carry out a more extensive review and include other aspects of design such as flanges. This rather more extensive review requires a business case to be put forward which is currently being considered.
Until the business case for the update of PD6547 is approved by The British Standards Institute the following should be considered when using the document.
Annex A.
Table A.1. Rationalised wind loading factor Rwf and maximum altitude.
1.Please note: For the following administrative areas-
Carmarthenshire; Clackmannanshire; Conwy; Cumbria; Dundee; Durham; East Dunbartonshire; East Renfrewshire, Falkirk; Glasgow; Wwynedd; Merthyr Tyfil; North Lanarkshire; Rhondda Cynon Taff; South Lanarkshire and Tyne & Wear -
that have a maximum altitude of 250m and Rwf of 576N/m^2 the BSEN1991-1-4 10 minute mean wind velocity needs adjusting to 25.56m/s to achieve the value associated with an Extra Heavy Loading Region.
2. Coventry is included under the West Midlands and should therefore be removed from the Warwickshire & Coventry administrative area.
Table A.2.
Mean Hourly wind Speed Vref should read 10 minute mean wind speed Vref.
Fatigue Requirements - only if applicable - Recommendation - use CD354
Updated Bibliography:
BSEN1991-1-4:2005 + A1: 2010 - Eurocode 1 Actions on Structures;
N.A. to BSEN1991-1-4:2005:2008 UK National Annex to Eurocode 1 Actions on Structures. General actions - wind actions(+A1-2010) (Incorporating National amendment No 1);
BSEN1999-1-3:2007 + A!:2011- Eurocode 9 Design of Aluminium;
BSEN1993-1-9:2005- Eurocode 3 Design of Steel structures - Part 1-9 Fatigue.
Design Manual for Roads and Bridges - Highway Structures & Bridges Design - CD354 Design of Minor Structures (Formerly BD94/17) Revision 1.