Proceedings of CICE 2012 6th International Conference on FRP Composites in Civil Engineering - Rome, Italy, 13-15 June 2012
This paper mentions the corrosion progress profile of the steel plate girder bridges under chloride attack and a rational method that prevents the attack by using FRP plates smartly. At first, it is confirmed by the laboratory tests and the bridge monitoring that the steel corrosions are promoted remarkably by existing of the surface chloride contents. The wind tunnel tests are also performed in order to confirm the wind flow in the inside of the bridge structure.
From the monitoring and the wind-tunnel-testing, the corrosion damage parts of the bridge girders and the transfer path of the aerosol chloride particles carried by wind between the girders become clear. Based on the clarified results, a construction measure to protect the girder system from the corrosion damage by closing the bridge cross section between the girders with FRP plates is proposed. Moreover, the FRP plates can be used as the inspection way. This smart FRP usage is applied to a steel girder bridge erected in Okinawa, Japan. The monitoring on the prevention effect obtained by the FRP cover plate is continued.
Keywords: FRP application, steel girder bridge, corrosion, monitoring, chloride attack