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Strengthening a steel bridge with CFRP composites

Strengthening a steel bridge with CFRP composites
Strengthening a steel bridge with CFRP composites
The present paper reports the successful strengthening of Acton Bridge on the London Underground system using carbon fibre reinforced polymer (CFRP) plates. The adhesive used to bond the plates to the steel had to cure while trains continued to run over the bridge. Concerns arising from this were the effect of cyclic load during curing on the final bond strength and whether adhesive flexibility affected the reinforced section
properties. Tests to investigate these concerns are also reported.
These tests involved reinforced beams subjected to cyclic loading of different intensities in bending during adhesive cure and tested statically at intervals to determine the build up of stiffness. The tests showed that, generally, adequate bond develops but at higher load intensities the strength of the bond is reduced and above limiting values of slip or developed shear stress at the steel/CFRP interface no bond will develop. A further
conclusion was that adhesive flexibility does reduce section properties but by less than about 7%.
Lap-shear tests conducted on specimens cut from the reinforced beams confirmed the bending test results. These showed that the biggest reductions in bond strength were at the ends of the beams where slip and shear stress were greatest
beams & girders/rehabilitation, reclamation & renovation/research & development/resins & plastics
0965-0911
81-93
Moy, S.S.J.
d1b1f023-d32a-4b00-8a3f-17c89f91a51e
Bloodworth, A.G.
08ac0375-0691-41d4-937d-d7d643dc8ddb
Moy, S.S.J.
d1b1f023-d32a-4b00-8a3f-17c89f91a51e
Bloodworth, A.G.
08ac0375-0691-41d4-937d-d7d643dc8ddb

Moy, S.S.J. and Bloodworth, A.G. (2007) Strengthening a steel bridge with CFRP composites. Proceedings of the Institution of Civil Engineers - Structures and Buildings, 160 (2), 81-93. (doi:10.1680/stbu.2007.160.2.81).

Record type: Article

Abstract

The present paper reports the successful strengthening of Acton Bridge on the London Underground system using carbon fibre reinforced polymer (CFRP) plates. The adhesive used to bond the plates to the steel had to cure while trains continued to run over the bridge. Concerns arising from this were the effect of cyclic load during curing on the final bond strength and whether adhesive flexibility affected the reinforced section
properties. Tests to investigate these concerns are also reported.
These tests involved reinforced beams subjected to cyclic loading of different intensities in bending during adhesive cure and tested statically at intervals to determine the build up of stiffness. The tests showed that, generally, adequate bond develops but at higher load intensities the strength of the bond is reduced and above limiting values of slip or developed shear stress at the steel/CFRP interface no bond will develop. A further
conclusion was that adhesive flexibility does reduce section properties but by less than about 7%.
Lap-shear tests conducted on specimens cut from the reinforced beams confirmed the bending test results. These showed that the biggest reductions in bond strength were at the ends of the beams where slip and shear stress were greatest

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Published date: 2007
Keywords: beams & girders/rehabilitation, reclamation & renovation/research & development/resins & plastics

Identifiers

Local EPrints ID: 46317
URI: http://eprints.soton.ac.uk/id/eprint/46317
ISSN: 0965-0911
PURE UUID: 3fa3107c-7106-4da3-9da1-25939be0af5c

Catalogue record

Date deposited: 15 Jun 2007
Last modified: 15 Mar 2024 09:20

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Contributors

Author: S.S.J. Moy
Author: A.G. Bloodworth

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