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Issue No. 50


AUGUST 2002 PROMOTING THE APPLICATION OF RESEARCH IN BUILDING AND CIVIL ENGINEERING


IN THIS ISSUE Buildings


U-values for light steel frames 5 Design


Light Earth Construction 4


Sewer rehabilitation guidance 7 Drainage


Promoting sustainable drainage 3 Sewer rehabilitation guidance 7


Environment


Adapting infrastructure to climate change


Aggregate from non-ferrous waste 2 Biomimetic coatings CEEQUAL Phase 2 Natural stone streets


Highways


Alternative road surfacing Materials


Alternative road surfacing Biomimetic coatings


2


2 8


Capturing concrete knowledge 6 Concrete durability guide Light Earth Construction


6 4


Non-destructive corrosion testing 4 Sewer rehabilitation guidance 7 U-values for light steel frames 5


River engineering


Humber Estuary realignment 3 Structures


Concrete durability guide Natural stone streets 6


Capturing concrete knowledge 6 Urban design


3


7 8


6 3


Promoting sustainable drainage 3 U-values for light steel frames 5


Tyred of waste?


Waste materials are both an embarrassment and a liability. HR Wallingford has just won a DTI Partners in Innovation (PII) contract to reduce both problems by examining potential uses for scrap tyres in coastal and river engineering.


A


bout 60% of the rubber consumed worldwide is used to produce tyres. Around 40 million tyres are scrapped each year in the UK alone and about 10 million of these end up in landfill. A European Directive will ban the disposal of whole tyres in this way by 2003 and of ‘tyre shred’ by 2006. There is therefore a looming problem of tyre disposal. ‘There is now technology that allows us to compress large numbers of tyres into cuboid bales,’ explains Jonathan Simm, HR’s Project Manager for the work. ‘These could be useful as void fillers in sea defences and bank protection.’ During the PII programme, researchers at Wallingford will work with partners from the Environment Agency, local authorities, recycling organisations, contractors and universities. ‘We will review current knowledge and look at case studies in the UK and overseas where scrap tyres have been used in engineering projects,’ says Simm.


DESIGN & MATERIALS


BS 5950–1: 2000’s amendments guide BS 5950–1: 2000, the major code for structural steelwork design, became effective


on 15 August 2001. A new publication from the Steel Construction Institute based on its research – Guide to the major amendments in BS5950–1: 2000 – eases designers’ transition to the new code.


T


he Guide gives short descriptions of each important change and simple worked examples illustrate the revised design procedures. The major changes are:


• revised rules for checking frame stability; • changes to the method for selecting an appropriate steel sub-grade;


• the introduction of the effective-area method for Class 4 slender sections;


• lateral-torsional buckling, where the n- factor method has been removed;


• changes to the clauses on shear buckling, stiffener design, tension members, compression members, combined axial load and bending and the design of column bases;


Research Focus Issue 50 AUGUST 2002


• in-plane stability of portal frames, prying forces;


• transverse strength of fillet welds.


The project was funded by Corus and the former DETR. The Guide (P-304, ISBN 1 85942 131 8) is available from Publications, The Steel Construction Institute at £40 for non-members or £20 for corporate members.


For further information please contact Dr Martin Heywood at Steel Construction Institute (01344 623345; fax: 01344 622944; E-mail:


m.heywood@steel-sci.com). www.steelbiz.org/shop


1


Enviro-Block tyre bales in use as part of an embankment dam (Photo courtesy of Anglo Environmental and Mackley Construction)


Laboratory scale tests will be carried out on the new rubber cuboids at Wallingford and there are plans to organise pilot studies of these at three UK sites.


For further information please contact Jonathan Simm at HRW (01491 822355; fax: 01491 825539; E-mail: jds@hrwallingford.co.uk).


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