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SCI CONNECT – June 2020

SCI are leading a European working group to draft a CEN Technical Specification giving recommendations for the design of steel-concrete composite (SC) structures. SC structures are typically used in two forms:

  • Two steel plates with shear stud connectors joined by a grid of tie bars with structural concrete between the plates (referred to as double skin composite or DSC), and commonly used for walls.
  • A single steel plate with shear stud connectors and T stiffeners welded to the plate (referred to as single skin composite or SSC), commonly used for floors.

The recommendations, which will ultimately come under EN1994-1-1, will be largely based on the outcomes of a European (RFCS) project coordinated by SCI which studied the behaviour of these structural forms both experimentally and numerically.

SC structures are suitable for buildings and other structures whose structural system comprises shear walls, floor slabs (or decks) or a combination of shear walls and slabs/decks. SC lends itself to offsite fabrication and modularisation using standardised components, leading to schedule and cost efficiency. It has proved particularly attractive where project economics are sensitive to speed of construction such as in the nuclear sector and for the core walls of high rise buildings.

In parallel, SCI is currently leading a major European project to quantify the cost and time benefits of SC construction and to build European fabrication and site construction expertise in this structural form.

For further information, contact Bassam Burgan:

SCI have formed a European working group to draft a CEN Technical Specification
Featured Article
NEW AISC Standard
NEW Presentation Available
Bespoke 'blind' Connectors
Members in the News
Members Advisory Desk
SCI Advisory Q&A
SCI Webinars, Courses
& Events
New Members
SCI Courses
Steel Connection Design Second Order Effects
7 & 9 July
10:00-12:00 - Both days
New Online Course
Steel Connection Design Connection Stiffness
14 Jul 20
Member Only webinar
Steel Connection Design Nominally Pinned Connections
21 & 23 July
10:00-12:00 - Both days
New Online Course
Steel Connection Design Steel Design at Elevated Temperatures
5 Aug
FREE for all to view
View all courses

We would like to thank all those that took part in the questionnaire for European Research project STROBE (Stronger steels in the built environment) about current practice for deflection checks, this is much appreciated. Currently the results from the survey are being analysed and will be published together with all the research information later in the year.


New Structural Stainless Steel Standard Available for Public Review

A new AISC standard, Specification for Structural Stainless Steel Buildings (AISC 370), is available for public review from June 8, 2020, to July 10, 2020.

AISC 370 will encompass the design, fabrication, and erection of austenitic and duplex structural stainless steels: sections made from annealed sheet, strip, and plate that have not been subsequently cold-formed or rolled; hollow structural sections; round and square bar, annealed and cold-finished; and hot-rolled or extruded shapes. It also applies to precipitation hardening stainless steel bar.

The standard is available for download on the AISC website at along with the review form. Nancy Baddoo and Francisco Meza of SCI lead the drafting process of this standard.

New Structural Stainless Steel Standard Available for Public Review

Presentation now available to view on-line.

Following the North American Steel Construction Conference in April this year, the one hour webinar presented by Nancy Baddoo entitled Structural Stainless Steel for Corrosive Environments, Resilience and Aesthetic Applications is now available to view here

Presentation now available to view on-line.
Testing of bespoke 'blind' connectors designed for thin material

For many years SCI has completed testing work and analysis of 'blind' fasteners (access is only possible from one side) for the Blindbolt company. In addition to data for the UK, this has included determining design resistances for the Blindbolt - a bolt with a gravity operated toggle - in accordance with AC437, which is an accreditation specification used across North America.

More recently, TW bolts ("Thin Wall") have been tested in tension, shear and bearing to determine design resistances for use with either BS 5950 or the Eurocodes. TW bolts have "legs" which deform on the "blind" side of the assembly as the fixing is tightened, clamping the two plies together. With a maximum connected thickness of 16 mm, the TW bolt is - as the name suggests - designed to be used with relatively thin material. Shear and bearing resistance is enhanced because of the larger diameter of the body of the connecter which participates in shear and presents a large diameter in bearing.

TW Bolt

Although testing in shear is straightforward, and followed ECCS guidance, testing in tension demanded some careful thinking to develop a test rig. The ECCS guidance shows a rig arrangement in principle, but reality is rather different. The rig had to be designed to allow repeat tests, pulling the sacrificial plates apart to introduce tension in the fixing, and being able to assemble the connection before testing. After some head-scratching, a design was developed and a prototype 'fabricated' in cardboard before commissioning the final design.

TW Bolt

In addition to testing the resistance of the fixings, SCI also wanted to investigate the behaviour in tension with thin plate, and examine any possibility of pull-through. A range of thin plates was tested for each fixing diameter. With thin plate, there is no pull-through, and there is no failure of the fixing itself. The thin plates were pulled apart until huge deformation was achieved - generally as much as 10 times the plate thickness, without failure. This is usual - the design criterion for tension forces applied to thin elements is not the resistance of the fixing itself or pull through, but limiting the local deformation of the supporting member.

The testing has now been completed, and results analysed in accordance with BS EN 1990. Design resistances for both carbon steel and stainless steel TW bolts are available on the Blindbolt website.

Members in the News

EOS Launch New Case Study Videos

EOS Launch New Case Study Videos The team at EOS are proud of their award-winning achievements and to showcase the outstanding projects they have been involved with - have launched a series of case study videos featuring:

  • Advanced Manufacturing Building
  • Sarah Swift Building, University of Lincoln
  • Travelodge, London
  • Wembley Park Regeneration

EOS Video Vault Bringing projects to life, these case study videos demonstrate what can be achieved using advanced fast-track steel framing systems. The EOS Video Vault also offers in-depth insight into not only their award-wining projects, but viewers can also take a virtual tour of their advanced light steel framing manufacturing facility together with a site study tour of Gardiner Place, a prestigious mixed-use development. The team at EOS are well regarded for the company's partnership ethos and are very proud of the relationships they develop - their video testimonials offer an independent view of the company's award-winning products and services.

EOS Video Vault

To view the EOS case study videos, take a virtual site study tour or discover more about advanced manufacturing go to:

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Members Advisory Desk Service email alerts

The new Advisory Desk service emails sent this month included;

  • Advisory Desk Note - AD 444 - Designing for access to facilitate cost effective operation and maintenance of steel buildings.
  • Advisory Desk Note - AD 445 - Corrosion protection of steel and composite bridges.pdf

If you are an SCI Sole Trader or Corporate Member and not receiving these emails alerts go to the SCI Information Portal and in your Profile click on notifications/alerts and select the notifications you require.

All the Advisory Desk Notes and Questions and Answers together with other technical resources are all available at all times on the SCI Information Portal.

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SCI Advisory Questions and Answers

For SCI Sole Trader and Corporate members, SCI offers support through our Advisory Desk Service. For questions asked which we feel are pertinent to the wider member audience we publish anonymously the questions and answers.

Where some questions relate to SCI Publications we publish the question and answers in Connect.

This month our published question is about; Limiting the area of disproportionate collapse

Question: The guidance covering the avoidance of disproportionate collapse includes the option of limiting the area of collapse. The rules generally refer to "floor areas". Do the same rules apply to roofs?

Please see the answers to this Advisory Question/Answer - Ref No 7147-20 and all Advisory questions on the SCI Information Portal.

The Advisory Desk Service is for SCI Corporate and Sole Trader Members | +44 (0) 1344 636525

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SCI Courses, Webinars and Events

New SCI Training Online

Due to the current situation with social distancing SCI has taken the decision to move its public training on-line for the time being. We are currently offering three new training courses, they include;

Second-order effects and frame stability

A four hour course taken in 2 x two-hour sessions
Tuesday 7 July - session 1 - 10:00-12:00
Thursday 9 July - session 2 - 10:00-12:00

This course will demonstrate that second-order effects are always present, and how they are managed in design. Starting with members and then moving on to entire frames. Read more

£120.00 SCI Members
£150.00 Non-Members

Nominally Pinned Connections
A four hour course taken in 2 x two-hour sessions
Tuesday - 28 July - session 1 - 10:00-12:00
Thursday - 30 July - session 2 - 10:00-12:00

These two sessions will cover the design of nominally pinned connections, based around the rules in the Green Book. In addition to the standardised connections, the course will address the more involved situations. Read more

£120.00 SCI Members
£150.00 Non-Members

For a description of each course and to book a place go to our events calendar.

Realising the Steel Design,  10 December 2019.

Next SCI Member webinar is;

Connection Stiffness
Tuesday 14 July - 12:30-13:30

Common UK practice has been to use intuition and experience to assess the stiffness of a connection - nominally pinned or nominally rigid. Previous satisfactory experience is one approach permitted in the Eurocode, but calculation processes are presented and software often has the facility to calculate connection stiffness. The webinar will look at the principles, the calculations and some software to draw comparisons.

Register to view this webinar.

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Next Free Webinar for all to view.

Steel design at elevated temperatures
Wednesday 05 Aug 11:00-12:00

Often, designers simply design for resistance at normal temperatures and expect the structure to be fire protected. But a little engineering can be used to calculate more realistic behaviour and to demonstrate the adequacy of the structure under fire conditions. Complex calculations can be avoided by the use of freely available design tools. This webinar will discuss the behaviour of steelwork at elevated temperature and the simple calculation models in the Eurocode.

Register to view this webinar.

We may have to postpone courses and we will contact you if the course you have registered for is running on the date advertised or provide you with a new date in the future.

For a list of webinars, online public courses visit the SCI Information Portal

Free Member Webinar
SCI Publications

Our bookshop is once again open for any hard copies of SCI Publications visit the SCI WebShop.

Guidance on Demountable Composite Construction Systems for UK Practice (P428))

Guidance on Demountable Composite Construction Systems for UK Practice (P428) This publication presents guidance and design data on demountable shear connection systems which can enable the steel beams and the potentially floor slabs, to be reused in composite construction. In this way, the benefits of composite construction can be achieved in the first and subsequent cycles of use.

Offsite Modular Steelwork - Design Advice (P430)

Offsite Modular Steelwork - Design Advice (P430) Increased offsite integration of structural steelwork with complementary building components and building services offers the opportunity of shorter site programmes, higher quality, reduced waste and a safer construction environment. This publication examines technical solutions that may be used to deliver benefits in multi-storey construction.

Offsite Modular Steelwork - Client Advice (P431)

Offsite Modular Steelwork - Client Advice (P431) This short information guidance has been prepared to alert clients, architects and constructors of multi-storey steel buildings to the opportunities of moving more of the construction offsite. The guide will illustrate where possible solutions which might be considered by the professional teams developing the design.




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New Members

SCI would like to welcome new members;

Bentley Systems (UK) Ltd
Aspire Consulting Engineers LLP

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