Revised TR55 for Strengthening Concrete Structures with FRP

14 January 2005

A major revision of Technical Report 55, Design guidance for strengthening concrete structures using fibre composite material, is published by the Concrete Society later this month. TR 55 was first published in December 2000, and is widely accepted as the industry standard on FRP strengthening.

Following the publication of TR 55 it became clear that some of the key aspects leading to the successful application of FRP strengthening included workmanship and the long-term performance of the materials. This led to a further project and the publication of Technical Report 57, Strengthening concrete structures using fibre composite materials: acceptance, inspection and monitoring in February 2003.

The use of fibre composites, using carbon, glass or aramid fibres, for the repair and strengthening of concrete structures has been growing rapidly over the past few years. Many types of structures have been strengthened, including bridges, commercial and industrial buildings, car parks and marine structures.

There has been further research and a number of significant developments since the publication of TR 55 in 2000 and hence it was decided that a Second Edition should be prepared. (It should be emphasised that there was no suggestion that the current design guidance was in any way unsafe.) As with the First Edition, the revision was carried out with financial support from major bridge owners and suppliers of strengthening materials. Technical input was supplied from across the industry, by academics, consultants, suppliers and specialist contractors.

It is intended that TR55 will be used in association with Technical Report 57 and thus does not include aspects of inspection and maintenance which are covered in TR 57.

The revised edition of TR55 includes an updated review of applications of FRP strengthening in the UK and abroad. It provides guidance on strengthening concrete structures, taking into consideration recent research and developments, and includes techniques such as near-surface-mounted reinforcement and shear strengthening. Reference is also be made to methods for strengthening other types of structures, such as masonry and metallic structures.

A NGCC Central Group Workshop will be held in Chesterfield, UK on Tuesday 16th November 2004 with Strengthening Concrete Structures with FRP as its central theme.

The event will examine in detail the second Edition of Concrete Society Technical Report 55: Design guidance for strengthening concrete structures using fibre composite materials with papers being given by John Clarke of The Concrete Society and others involved with the development of the new Edition.

The workshop, which will launch the new NGCC Central Group and outline its aims and objectives, will be of particular interest to contractors, designers, materials suppliers and the academic community.

A more detailed summary of the NGCC workshop along with a registration form for the event is available here

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