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The Structural Engineer

Tests carried out on 20 150 x 150 x 200 mm concrete corbels are reported. The corbels were reinforced with either fibres, or main bars and fibres. The volume fraction of steel or polypropylene fibres, or main bars, was kept constant at nearly 0.7%. Plain concrete corbels were also made and tested for comparative purposes. Parameters varied included fibre type, two shear span-to-depth ratios, and a limited range of compressive strengths of concrete. Only vertical loading was used during testing. Test results indicated that the addition of fibres improved both flexural and shear strengths of the corbels. When fibres with improved bond characteristics were used, the failure mode of some corbels changed from being diagonal splitting to flexure. The service loads were also increased by the addition of all types of fibre. Professor B.P. Hughes and N.I. Fattuhi

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The Structural Engineer

Composite concrete slab bridges formed from inverted, precast, pretensioned T-beams, pitioned with their bottom flanges almost touching and with in situ concrete around and above their webs and top flanges, have proved to be an economical and popular form of construction in the UK for spans up to about 18m. For design purposes, this form of construction is assumed to behave as an orthotropic slab. To determine the actual response to high load, overall factors of safety and the suitability of analytical methods, two 1:3.5 scale models were tested and analysed. The results are of particular interest to structural engineers messing this form of Construction. Professor R.J. Cope and M. Cope

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The Structural Engineer

An informal presentation will be made to a meeting of the lnstitution on Thursday 9 March of the organisation and some of the design aspects of the Channel Tunnel terminal works. J.H. Armstrong

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The Structural Engineer

Quality assurance Mr J. S. Scott has sent us this comment on the use of ‘peer review’ in North America: ‘Peer review’, as used in North America, is a procedure, supported by several professional engineering institutions, which for consultants seems much quicker and easier to organise than ‘quality assurance’, as well as demanding less paperwork, being simpler, effective and approved by assurers. Verulam

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