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SCI CONNECT – June 2019

Supported by Innovate UK, a BCSA led and primarily SCI delivered project commenced in April 2019 to investigate the opportunities to improve construction sector productivity through the use of integrated offsite steel modules. The project aims to realise this objective by providing the steel construction supply chain with the knowledge, confidence and incentives to include integrated offsite steel modules in the design, manufacture and construction of mainstream steel framed buildings.

The objectives within the project are to:

  • Develop and publish design exemplars of integrated modules which may be used by all construction disciplines,
  • Increase the degree of offsite manufacturing used in mainstream steel construction,
  • Facilitate collaboration between construction disciplines to develop modular solutions,
  • Contribute to Government objectives to reduce site construction time, increase productivity, improve site safety and address onsite skill shortages.

Now nearly three months into this 11 month project we have held a very successful workshop where key players from the sector discussed current state-of-the-art and identified solutions that we feel have the potential to realise the project objectives. These include options for floors, walls, roofs and structural cores that combine structure with services - combining trades offsite to achieve speed and quality onsite.

The proposed solutions were informed by a number of case studies, which show what offsite manufacture and integration can already achieve when there are certain constraints - congested site with restrictions on cranage, site access restricted by 'night time possessions', cellular building form with relatively short spans, etc.

The final outcomes from the project will be guidance for designers and clients that show how integrated offsite modules can be used in mainstream steel buildings - i.e. those that do not have such constraints.


Modular MEP

Image Courtesy of Severfield (UK) Ltd

Contents
Featured Article
Courses
Additional News Items
News In Brief
Member News
Publications
 
SCI Courses
Steel Connection Design Fire Resistance of Composite Slabs and Beams
09 July 19 - Webinar
Steel Connection Design Portal Frame Design course
11 July 19
Steel Connection Design UK Construction Day 2019: Innovative Steel Solutions
07 Nov 19
View all courses
Test on an 11.2m Span Cellular Beam for Demountable Construction

As part of the EU-research project, called REDUCE, a load test to failure on a demountable composite cellular beam was carried out at Bradford University on 18th June, which proved to be successful. The 11.2m span cellular beam used a 305 x 305 x 97 kg/m UC bottom Tee and a 305 x 165 x 46 kg/m UB top Tee, which had an asymmetry of 2.4:1 in its flange areas.

The cellular beam was 427mm deep and had regular 300mm diameter openings at 450mm centre-centre spacing. The span: depth ratio of the cellular beam was 26, which is typical of composite construction designed for optimum serviceability performance. The test beam at its maximum test load is shown in Figure 1.

The composite beam used 20mm diameter bolted shear connectors cast into a 150mm deep composite slab. The bolts were connected by nuts above and below the top flange and so could be detached with the slab by un-tightening from below. To facilitate re-use of the slab and the beam, a 120mm deep double edge trim was also cast into the slab along the centre-line of the beam and the bolted shear connectors were placed either side in a staggered pattern. The double edge trim provided a cut-line in the slab that could be demounted by being sawn into segments and unbolted, and then re-assembled for a second cycle of use as a composite beam of the same dimensions and properties.

The test objectives were to show that long span composite beams could be designed for a low degree of shear connection using this new type of demountable shear connector and also that local composite action could be achieved at the openings to resist Vierendeel bending. The test load at failure was an equivalent uniform load of 24.1 kN/m2 (760 kN total load) plus the self-weight of the slab and beam, which was 10% higher than the predicted load based on the steel strengths and a shear connector resistance obtained from push tests.

The test failure mode was in pure bending by tension yielding of the bottom Tee. The degree of shear connection was 38% based on measured material properties, which is less than to the minimum to Eurocode 4. The measured slip in the bolted shear connectors was 8.3mm at failure, which demonstrated their high deformation capacity and showed that their longitudinal shear resistance was achieved.

SCI will prepare guidance on demountable composite construction based on this and other tests performed under REDUCE. For more information on demountable composite construction, contact Ana Girao-Coelho at SCI.

Figure 1: 11.2m span composite cellular beam tested to failure at Bradford University

Figure 1: 11.2m span composite cellular beam tested to failure at Bradford University

SCI Assessed Scheme

Firth Steels expand their range of SCI Assessed Products

Firth Steels have expanded the range of their steel cladding sheets which are covered by the SCI Assessed independent verification scheme. Firth Steels already had several of their products and the associated load resistance data covered by the SCI Assessed scheme and have recently extended this to include the N14/3 sinusoidal profiles and the SR30+ roof decking profiles. Load span resistance tables are available in accordance with EN 1993-1-3 for a range of cold formed steel roof decking and cladding sheets.

For further details of the SCI Assessed scheme please contact Andrew Way.

Firth Steels expand their range of SCI Assessed Products

NHBC Stage 1 Certification for Osco Homes

The SCI has assessed the structural aspects of the Osco Homes panelised steel frame system for NHBC Stage 1 System Certification. This process has confirmed that the system is suitable for use in the construction of dwellings in accordance with NHBC Standards Chapter 6.10 "Light steel framing".

The system has been assessed for residential single occupancy dwellings up to four storeys high. As its basic components the system uses cold rolled galvanised C-sections for wall studs and floor joists designed in accordance with BS EN 1993-1-3.

SCI/NHBC Stage 1 System Certification considers the structural strength, stability and durability aspects of a light steel frame system in accordance with the 2019 version of NHBC Chapter 6.10. The scope of a system's certification may be extended, at the request of the manufacturer, using the new SCI Product Certification scheme to include additional aspects of performance:

  • Behaviour in relation to fire.
  • Acoustic performance.
  • Moisture control, including thermal performance, condensation risk and water ingress.
  • Wall construction.
  • Balconies, terraces and parapets.

Please contact Andrew Way for more information on SCI/NHBC Stage 1 System Certification for light steel framing.

NHBC Stage 1 Certification for Osco Homes
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Steel Bridge Group - Industry Consultation - Have your say.

Two years ago, SCI's Steel Bridge Group (SBG) conducted an industry consultation involving a wide range of clients, consultants, contractors, fabricators and other specialists in order to gain a better understanding of the areas on which the group should be focusing regarding the development of best practice guidance over the next few years. This consultation exercise clearly indicated that the whole-life performance of structures requires better consideration at the early stages of the design process in order to consider whole-life costs and minimise the need for expensive maintenance interventions in later life. The SBG has therefore initiated a 'Design for Operation & Maintenance' workstream in order to identify the main access and maintenance problems on steel bridges and subsequently develop relevant guidance for the future.

As a first step, the SBG has developed an online survey (mainly directed to railway, trunk road and local authorities, maintaining agents/contractors, PPP concessionaire with maintenance responsibility as well as other bridge asset owners/maintainers) to better understand problems encountered with steel bridges, maintenance regimes and design approval procedures for new bridges. As the survey covers a wide range of topics and has some in-depth questions, it will take approximately 35 minutes to complete. You may wish to preview the full range of questions first to understand what information is required before you complete the full online survey which can be found here.

The Steel Bridge Group is very grateful for your time spent answering this 'Operation and Maintenance' survey as it will form the basis of the future SBG guidance produced on this important subject.

If you have any questions regarding the survey, contact Guillaume Vannier, SBG Secretary, SCI.

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News in Brief

Eurocode training - in Africa!

Following an invitation by the Kenya Bureau of Standards, David Brown has travelled to Machakos, near Nairobi, to speak at an awareness workshop and then deliver a full week of in-depth technical training on steel design to the Eurocodes. SCI's association with Kenya goes back some years, starting with an initiative to consider how the market share for steel could be increased. More recently, a webinar series was delivered to Kenyan engineers, covering design to BS 5950 - the current Standard. To quite a short timescale, Kenya has decided to adopt the Eurocodes as the national Standard, so a recent webinar series introduced aspects of Eurocode design and this has been followed up by two weeks of training in Africa.

Like any country, Kenya must prepare a National Annex - whilst it is probable that for many design issues Kenya will follow the UK, the climatic actions are of course very different, and specific Kenyan documentation will need to be prepared. One advantage for Kenya in adopting the Eurocodes relatively late is that very many technical resources such as the Blue Book are already available for use, which will help the transition.


Eurocode training - in Africa!

SCI Advisory Questions and Answers

For SCI Sole Trader and Corporate members, SCI offers support through our Advisory Service. This month our published question is about Cover plates for long slotted holes;

Question: BS5950 clause 6.4.6.3 refers to long slots in the outer ply and an external cover plate. What is meant by an outer ply in this case? Why is a cover plate necessary?

If you are an SCI member please see the answer to all Advisory questions on the SCI Information Portal.

The Advisory Desk is for SCI Corporate and Sole Trader Members
advisory@steel-sci.com | +44 (0) 1344 636525


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Members in the News

Caunton Young Engineers awarded ICE Quest Scholarships

Earlier this year two of Caunton Engineering's trainee structural engineers were each awarded a QUEST Technician Scholarship by the East Midlands Branch of the Institution of Civil Engineers. Both young engineers, Adam Jameson and Matthew Waterhouse, are studying on part time BSc courses at Nottingham Trent University. The scholarship requires the candidate to assist the ICE with an event which promotes civil engineering, the ICE or the QUEST Technician awards, and Adam was asked to assist at the ICE East Midlands Merit Awards and Dinner in Nottingham. Adam was rewarded with meeting the speaker Rory Underwood -see the photograph. Caunton warmly congratulates our two trainee engineers, and hopes they will enjoy this valuable experience.

Adam Jameson & Rory Bremner
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Courses, Webinars and events

Please see all of our Courses, Webinars and Event listings on our website.

NEXT SCI Member Webinar

Fire Resistance of Composite Slabs and Beams - Webinar
Tuesday 9 July 2019

This webinar provides a solid introduction to the design of composite slabs and beams at elevated temperatures.

SCI members only
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Webinar

Portal Frame Design course
Thursday 11 July 2019, Nottingham

This course aims to provide in-depth coverage of the major issues surrounding the analysis, design and (crucially) the detailing of portal fames.

Having attended this course you will be able to;
Properly assess the loading on a portal frame structure
Understand the underlying principles of portal frames
Confidently check the analysis, design and details of a portal structure.

SCI Members: £220.00 + VAT
Non Members: £280.00 + VAT
Register for this course


Portal Frame Design Course
Publications
Minimum degree of shear connection rules for UK Construction to Eurocode 4 (P405)

Minimum degree of shear connection rules for UK Construction to Eurocode 4 (P405) Developments in decking products and UK construction practice have, in some cases, resulted in shear stud resistances dropping below the values that were traditionally used in design. This publication takes into accounts a number of variables which results in less onerous requirements for the minimum degree, thereby enabling composite solutions that according to the code would be inadmissible.

Steel Bridge Group: Completion of Appendix 18/1 (P418)

Steel Bridge Group: Completion of Appendix 18/1 (P418) This document provides guidance on the completion of an 'Appendix 18/1' document, to supplement the requirements of the Highways England and Network Rail client specifications for highway works and for railway steelwork. This is an Electronic Document only.

Brittle Fracture Selection of Steel Sub-Grade To BS EN 1993-1-10 (P419)

Brittle Fracture Selection of Steel Sub-Grade To BS EN 1993-1-10 (P419) This guide explains how an approach based on fracture mechanics, which is a method permitted in BS EN 1993-1-10, may be used to determine the required steel sub-grade. Application of the procedures in this guide should be limited to quasi-static structures, where fatigue is not a design consideration.

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