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In my first feature comparing CP32 and BS 6399: Part 23 I focused on misapplication of
the CP3 rules for changes of roughness as the principal reason that BS 6399: Part 2 is erroneously perceived to give larger loads than CP3. However, there is one change between the two Codes that does tend to increase structural loads and that is the modification of the ‘division by parts’ rule - clause 5.5.2 of CP3 and clause 22.214.171.124 of BS 6399: Part 2.
The paper describes the design and construction of the Trafford Centre, a major regional shopping and leisure centre on the outskirts of Manchester. It contains 140 OOO m² of shops and related facilities set within a landscaped site adjacent to the M63
motorway. Parking for 10 000 cars is provided. The superstructure contains over 16 OOOt of structural steel. There are simply supported beam and column arrangements, with
complex lateral bracing to provide free access to malls and shops. Fast-track parallel working between the client, the design team, the management contractol; and the subcontractors, is an essential feature. The ability to control and accommodate change,
sometimes after the structure was complete, occurred as the design developed and tenant needs were clarified. Over 30M persons will visit the centre each year.
D.A. Woodward and I.B. Povall
The comments by Mike Heath, Director General of the Engineering Council referred to in ‘Structural news ’ for 4 November 1997, has raised more correspondence. Mr E. N.
Carmichael has written from Bridgnorth in Shropshire in response to the anonymous letter published in Verulam, 20 January 1998:
I am moved to respond to the question raised by Verulam as a result of an anonymous correspondent on the validity of average salaries claimed to be £40 131 p.a.