Carbon fibre strengthening of precast reinforced concrete inverted U bridge beams

Main Roads Western Australia has a number of bridges constructed from precast reinforced concrete inverted U beams. Concern has been expressed about their shear capacity and moment capacity at the location of curtailment of the main flexural reinforcement, particularly with loads from dual and tri axle groups. Recently three bridges were removed from service and replaced with new construction. This provided the opportunity to test the ultimate capacity of the removed beams. A series of laboratory tests was conducted as the initial phase of research into the strength characteristics of these beams. The testing utilised 13 standard internal beams, 7 non-standard internal beams with external strengthening by 100 mm by 10 mm steel plate, and six standard internal beams which had 80 mm by 1.2 mm carbon fibre straps applied to the bottom of both webs as part of the testing program. The strengthening with carbon fibre straps increased the stiffness of the beams and resulted in strength increases of between 20 per cent to 30 per cent when compared with the standard beams. (a) For the covering entry of this conference, please see ITRD abstract no. E211602.


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  • Accession Number: 01011232
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0855886986
  • Files: ITRD, ATRI
  • Created Date: Dec 19 2005 2:55PM