NSC 27
Apr 20
FROM
Packaged buildings for cash and carry
Butler Buildings (UK) Limited, London office
at 113 Upper Richmond Road, SW15, are at
present engaged in a program for Crest Cash
and Carry Stores (Gallaher’s Limited) which
provides an interesting example of steel
buildings into one of today's growth businesses.
The building pictured is the recently
completed Hull store. As with other Butler
Buildings for Crest the architects were
Boissevan and Osmond, Epsom, and
construction of the complete package was by
Geo Houlton and Sons Ltd of Hull, Butler Builderdealers
for the area. B.B. (UK) Ltd, the European
subsidiary of Butler manufacturing Co, Kansas
City, the world's largest manufacturers of
pre-engineered metal buildings, supplied the
primary and secondary structurals from their
plant at Kirkcaldy, Fife. Cladding was supplied
by Butlers Canadian plant, although production
of this has now commenced in the UK. The
building clad both in Monopanl 24/26G dual
skin with glass fibre infill and Butlerib single
skin sheeting backed with board insulation
shows the harmony achieved with burnished
gold walls and parchment Butlerib roof. The
roof is insulated throughout with Butler 25
insulation blanket.
Erection time for the building was 42 days,
the entire project being completed by Houltons
in 21 weeks. 85 tons of steel were used. The
primary structurals being plate steel, sheared
and welded with roll-formed secondary
structurals.
This Crest store is one of Butlers LRF range
120ft clear span 168ft along with 2ft x 24ft
width extensions to form a 168ft foot square
building. Canopy as shown is steel 26G
Butlerib and steel gutters and downpipes are
used throughout.
Crest Cash and Carry stores incorporate a
very high standard of shopfitting to provide an
attractive interior - at Hull this work was also
entrusted to Messrs Houltons using a variety of
materials which enhance the clean lines of its
steel frame.
Other projects to the same specification
have been completed at Morley near Leeds
where the Butler Builders were R.M. Thompson
Ltd of Leeds, and Butler are at present engaged
on the construction of the Clayton, Manchester,
store.
needed to achieve the required beam resistance.
Often, the design of composite beams is governed
by serviceability limits, and they are not designed
to achieve their full bending resistance. In such
cases the studs provided are needed in order to
satisfy the rules for minimum degree of shear
connection, which are associated with limiting slip
at the steel to concrete interface. So in terms of
beam resistance alone, fewer studs could be used,
and therefore less transverse reinforcement.
AD 241 therefore proposed applying a
reduction factor to the longitudinal shear force
that was a function of the applied moment
divided by the moment resistance.
As noted above, a big change since AD 241
was originally written has been the publication
of P405. Covering composite beams with both
transverse and parallel decking, and considering
a wider range of variables than EN1994-1-1, it
provides new rules for minimum degree of shear
connection. In many cases the number of studs
needed on a beam has dramatically reduced
compared to the EN1994-1-1 provisions. It is
worth noting that one of the variables considered
is the beam utilisation in bending, with minimum
degree of connection now varying according to:
MEd
MRd 2
Applying the original guidance given in
AD 241 alongside the guidance in P405 could
therefore result in a certain amount of double
counting. Moreover, when beams are designed
in accordance with P405 it is unlikely that the
‘old problem’ of being unable to accommodate
sufficient transverse reinforcement to provide a
resistance in excess of that of the shear connectors
will remain.
By applying the rules in P405 (which appear in
numerous design software packages) there is no
need for AD 241.
Contact: Eleftherios Aggelopoulos
Tel: 01344 636555
Email: advisory@steel-sci.com
Building
with Steel
May 1970
50 years ago
/Member_design#Bending
/Steel_construction_products#Decking_for_floors
/SCI_P405.pdf
/Design_software_and_tools#Composite_Beam_Checking_Tool
link