Codes & Standards/50 Years Ago
NSC 31
February 18
BRITISH STANDARDS UNDER
REVIEW
BS ISO 16160:2012
Hot-rolled steel sheet products.
Dimensional and shape tolerances
DRAFT BRITISH STANDARDS FOR
PUBLIC COMMENT - ADOPTIONS
17/30332299 DC
BS EN ISO 11125-5 Preparation of
steel substrates before application
of paints and related products. Test
methods for metallic blast-cleaning
abrasives. Part 5. Determination of
percentage defective particles and of
microstructure
Comments for the above document
were required by 21 December 2017
CEN EUROPEAN STANDARDS
EN 10263-4:2017
Steel rod, bars and wire for cold
heading and cold extrusion. Technical
delivery conditions for steels for
quenching and tempering
EN 10263-5:2017
Steel rod, bars and wire for cold
heading and cold extrusion. Technical
delivery conditions for stainless steels
NEW WORK STARTED
EN 10139:2016/A1
Cold rolled uncoated low carbon
steel narrow strip for cold forming.
Technical delivery conditions
EN 10283
Corrosion resistant steel castings
Will supersede BS EN 10283:2010
ISO PUBLICATIONS
ISO 544:2017
Welding consumables. Technical
delivery conditions for filler materials
and fluxes. Type of product,
dimensions, tolerances and markings
Will be implemented as an identical
British Standard
ISO 12944-1:2017
Paints and varnishes. Corrosion
protection of steel structures by
protective paint systems. General
introduction
Will be implemented as an identical
British Standard
ISO 12944-2:2017
Paints and varnishes. Corrosion
protection of steel structures
by protective paint systems.
Classification of environments
Will be implemented as an identical
British Standard
ISO 12944-3:2017
Paints and varnishes. Corrosion
protection of steel structures by
protective paint systems. Design
considerations
Will be implemented as an identical
British Standard
ISO 12944-4:2017
Paints and varnishes. Corrosion
protection of steel structures by
protective paint systems. Types of
surface and surface preparation
Will be implemented as an identical
British Standard
ISO 12944-7:2017
Paints and varnishes. Corrosion
protection of steel structures by
protective paint systems. Execution
and supervision of paint work
Will be implemented as an identical
British Standard
ISO 12944-8:2017
Paints and varnishes. Corrosion
protection of steel structures by
protective paint systems.
Development of specifications for
new work and maintenance
Will be implemented as an identical
British Standard
ISO 13887:2017
Steel sheet, cold-reduced, of higher
yield strength with improved
formability
Will be implemented as an identical
British Standard
ISO 20805:2017
Hot-rolled steel sheet in coils of
higher yield strength with improved
formability and heavy thickness for
cold forming
Will be implemented as an identical
British Standard
ISO 22825:2017
Non-destructive testing of welds.
Ultrasonic testing. Testing of welds
in austenitic steels and nickel-based
alloys
Will be implemented as an identical
British Standard
New and revised codes & standards
From BSI Updates December 2017 and January 2018
Reprinted from Volume 5 No. 1
February1968
‘A’ frame fabricated from mild steel plate and
standing externally above the roof line.
The ‘A’ frame is anchored back by two circular
hollow sections (CHS) to the lift tower
which acts as a counterweight on the axis of
the building, thus providing a tied cantilever
from which the auditorium roof is hung. The
two CHS front ties each pick up two raking
main trusses placed, on plan, on the bisectors
of the auditorium splays forming the hips of
the roof and spanning on to tubular columns
placed at the perimeter of the auditorium.
In a similar manner main trusses span
from the feet of the ‘A’ frame legs to the perimeter
of the auditorium, on-line with the
stage wing walls. Secondary trusses at 6 ft
9 in centres span between the main trusses,
reflecting the pattern of the seating below.
Channel-reinforced woodwool spans directly
onto the secondary trusses, the channel being
bolted to tees on the top booms to provide
lateral restraint.
A glazed lantern is incorporated between the
two front ties and their respective compression
tubes, the depth being used to span the
rectangle formed by the feet of the ‘A’ frame
and the intersection points of the main
trusses. Horizontal wind bracing is provided
across the lantern opening and between the
secondary perimeter trusses, and vertical
bracing to the pin jointed perimeter stanchions.
The main trusses are cantilevered
beyond the perimeter stanchions to form a
canopy to the external access balcony. Access
to the roof structure and the projection box is
by a continuous walkway around the auditorium
perimeter.
The lower booms of secondary trusses carry
stage lighting equipment: the main auditorium
lighting consists of tungsten fittings fixed
direct to the soffit above the roof structure.
All structural members of the auditorium
roof are constructed from CHS. Secondary
truss-to-main-truss connections were made
by site welding via a split cup and main connections
were bolted through flange plates.
The ‘A’ frame was erected in one piece, the
back ties and respective compression tubes
anchored to the lift shaft and the lantern
structure front ties and main trusses then
erected in sequence. Steelwork erection was
completed in six weeks. Roof cladding consists
of snaprib aluminium on felt, insulation
board, a vapour barrier and 2-in thick
woodwool.
Architects and structural engineers – Robert
Mathew, Johnson-Marshall and Partners.