Codes & Standards / Advisory Desk
NSC 29
Jun 20
New and revised codes & standards
From BSI Updates May 2020
BS EN PUBLICATIONS
BS EN ISO 21904-1:2020
Health and safety in welding and allied processes.
Equipment for capture and separation of welding
fume. General requirements
supersedes BS EN ISO 15012-4:2016
BS EN ISO 23386:2020
Building information modelling and other digital
processes used in construction. Methodology
to describe, author and maintain properties in
interconnected data dictionaries
no current standard is superseded
BS IMPLEMENTATIONS
BS ISO 4992-1:2020
Steel castings. Ultrasonic testing. Steel castings for
general purposes
supersedes BS ISO 4992-1:2006
BS ISO 4992-2:2020
Steel castings. Ultrasonic testing. Steel castings for
highly stressed components
supersedes BS ISO 4992-2:2006
BS ISO 21455:2020
Mobile elevating work platforms. Operator’s
controls. Actuation, displacement, location and
method of operation
no current standard is superseded
BRITISH STANDARDS REVIEWED AND
CONFIRMED
BS EN ISO 15609-4:2009
Specification and qualification of welding
procedures for metallic materials. Welding
procedure specification. Laser beam welding
BS EN 1011-1:2009
Welding. Recommendations for welding of
metallic materials. General guidance for arc
welding
BRITISH STANDARDS WITHDRAWN
BS EN ISO 15012-4:2016
Health and safety in welding and allied processes.
Equipment for capture and separation of welding
fume. General requirements
Superseded by BS EN ISO 21904-1:2020
BS ISO 4992-1:2006
Steel castings. Ultrasonic examination. Steel
castings for general purposes
Superseded by BS ISO 4992-1:2020
BS ISO 4992-2:2006
Steel castings. Ultrasonic examination. Steel
castings for highly stressed components
Superseded by BS ISO 4992-2:2020
BRITISH STANDARDS UNDER REVIEW
BS EN 14399-1:2015
High-strength structural bolting assemblies for
preloading. General requirements
BS EN 14399-2:2015
High-strength structural bolting assemblies for
preloading. Suitability for preloading
BS EN 14399-3:2015
High-strength structural bolting assemblies for
preloading. System HR. Hexagon bolt and nut
assemblies
BS EN 14399-4:2015
High-strength structural bolting assemblies for
preloading. System HV. Hexagon bolt and nut
assemblies
BS EN 14399-5:2015
High-strength structural bolting assemblies for
preloading. Plain washers
BS EN 14399-6:2015
High-strength structural bolting assemblies for
preloading. Plain chamfered washers
BS EN 10034:1993
Structural steel I and H sections. Tolerances on
shape and dimensions
NEW WORK STARTED
EN ISO 9606
Qualification test of welders. Fusion welding
will supersede BS EN ISO 9606-1:2017
ISO 21928-2
Sustainability in buildings and civil engineering
works. Sustainability indicators. Framework for the
development of indicators for civil engineering
works
will supersede None
AD 443: The use of fully threaded bolts
SCI has been surprised to hear of the use of
fully threaded bolts being questioned, as these
have been in common use – and have been the
standard bolt used – for very many years.
The potential advantage of partially threaded
bolts is that they obviously have a slightly
higher shear resistance if the shear plane is in
the unthreaded length. The disadvantages of
calculating precise unthreaded lengths, which
must be neither too long nor too short, and
relating each bolt length to specific connections,
far outweigh the increased resistance. On site,
multitudinous bags of different bolt lengths give
ample opportunity to install the wrong bolts. In
contrast, a standard M20 x 60 mm fully threaded
bolt may be used in the vast majority of site
connections.
The use of fully threaded bolts was
recommended in the first “Green Book” of 20021
and the Eurocode version of 20142.
Concerns with fully threaded bolts may
relate to the supposed increased in bearing
deformation, if the threads engage with the steel
rather than the unthreaded shank. Investigations
of the behaviour of fully threaded bolts were
reported by Graham Owens in 19923. Although
fully threaded bolts in bearing show a lower
initial stiffness, the bearing strength actually
increases slightly, due to the constraint offered
when the threads dig into the plate material. The
deformation in bearing of a fully threaded bolt is
slightly more than that of a plain shank, but the
increase is not relevant when bolts are already in
2 mm oversize holes.
If designers are concerned about deformation
in a joint, the issue does not concern whether
fully threaded or unthreaded bolts are specified
– the difference in performance is insignificant.
If deformation in the joint must be avoided,
preloaded assemblies must be specified.
It should be noted that shear and tension
resistances quoted (in the Blue Book, for
example) always use the cross section in the
threaded length as the basis of the resistance
calculations – and are therefore safe.
Contact: SCI Advisory
Tel: 01344 636555
Email: advisory@steel-sci.com
1. Joints in steel construction. Simple connections
(P212), SCI and BCSA, 2002
2. Joints in steel construction. Simple joints to
Eurocode 3 (P358), SCI and BCSA, 2014
3. Owens, G, W., The use of fully threaded bolts for
connections in structural steelwork for buildings.
The Structural Engineer, Volume 70, September
1992
/Construction#Site_bolting
/Preloaded_bolting
/The_Blue_Book
/The_Green_Books#Simple_connections
/The_Green_Books#Simple_connections
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