New and revised codes & standards
From BSI Updates September 2019
BS EN PUBLICATIONS
BS EN ISO 945-1:2019
Microstructure of cast irons. Graphite classification
by visual analysis
Supersedes BS EN ISO 945-1:2018
BS EN ISO 7053:2019
Fasteners. Hexagon washer head tapping screws
Supersedes BS EN ISO 7053:2011
BS EN ISO 15480:2019
Fasteners. Hexagon washer head drilling screws
with tapping screw thread
Supersedes BS EN ISO 15480:1999
AD 434:
Validity rules for hollow section joints
40 NSC
October 19
BS IMPLEMENTATIONS
BS ISO 945-4:2019
Microstructure of cast irons. Test method for
evaluating nodularity in spheroidal graphite cast
irons
No current standard is superseded
BRITISH STANDARDS WITHDRAWN
BS EN ISO 7053:2011
Hexagon washer head tapping screws
Superseded by BS EN ISO 7053:2019
BS EN ISO 15480:1999
Hexagon washer head drilling screws with tapping
screw thread
Superseded by BS EN ISO 15480:2019
CEN EUROPEAN STANDARDS
EN ISO 945-1:2019
Microstructure of cast irons. Graphite classification
by visual analysis
(ISO 945-1:2019)
EN 1993-1-5:2006/A2:2019
Eurocode 3. Design of steel structures. Plated
structural elements
Codes & Standards/Advisory Desk
This AD note concerns a significant typographical
error in Table 7.8 of BS EN 1993-1-8. The table
presents validity limits for welded joints between
hollow section brace members and RHS chord
members.
For the common case of a K or N overlap,
there is a limitation under the “Gap or overlap”
column expressed as:
bi /bj ≤ 0.75
where bi is the width of the overlapping
bracing member, and bj is the width of the
overlapped member. Thus the limit precludes
bracing members of the same size, for which
bi /bj = 1 , and this is clearly wrong.
In fact, the limit should be expressed as:
bi /bj ≥ 0.75
which prevents a narrow overlapping bracing
being welded to a wide overlapped brace, but
permits bracing of the same width to be used.
This limit is correctly expressed in literature
published by Tata Steel, and has been corrected
in the draft revisions to EN 1993-1-8.
As an aside, it may assist designers to note
that definitions of some factors that appear in
the joint verification expressions, such as β, λov, n
and γ are found in Section 1.5 of BS EN 1993-1-8,
not in Section 7 as might be expected. Similarly
the definition and dimensions of gap and
overlap joints are found in Figure 1.3, rather than
in the section concerned with hollow section
joints.
Contact: Richard Henderson
Tel: 01344 636555
Email: advisory@steelconstruction.org
Search for Advisory Desk
articles on newsteelconstruction.com
Use the search bar at the top of every
page of newsteelconstruction.com
to search out Advisory Desk articles
by name, number or subject, or list
them (most recent first) by hovering
over Technical in the main menu and
selecting Advisory Desk from the
resulting pop-up menu.
/Steel_construction_products#Structural_hollow_sections
/Welding
/newsteelconstruction.com
/newsteelconstruction.com
link