DANIEL RODRIGUEZ AMATON

CFRP repair for connections in steel structure (鋼構造物継手部のCFRP補修)

TAKESHI MIYASHITA

In recent years, the maintenance of civil engineering structures has turned into a problem in Japan due to aging of the infrastructure, those maintenance works include inspections in steel bridge?fs joints, which in many cases tend to present corrosion damage in most cases. 
Welding and splice plate application are the common reparation methods, but they require heavy machinery and compromise the member?fs performance. In these situations, the repair method with Carbon Fiber Reinforcement Plastic (CFRP) in steel joints is proposed due to its low weight, high strength resistance, high elasticity and high anti-corrosive features. Recently, CFRP repair has been applied to the web and lower flange of actual bridges, so obtaining data on cases where CFRP reinforcement is applied to steel joints such as splice plates of steel beams is of interest.
This research focus on CFRP repair and reinforcement for connections in steel structures. There were conducted four-point bending tests on three different experimental cases of steel girder beams with corrosion near the splice plates in order to get new data such as the stress reduction and the maximum load capacity and confirm the repair effect by CFRP.
After conducting the bending experiments, principally we obtain the next results on this research:
1.We can appreciate that the maximum load reached for a healthy specimen before slipping is obtained over the 650 kN point. 
2.As for the damaged specimen by corrosion, it barely obtained its maximum load on the range of 630 kN. Making clear the effect that a specimen suffers when having its cross section reduced and damaged by corrosion.
3.As for the CFRP reinforced specimen the maximum load was reached at a point near 680 kN surpassing the maximum load of the healthy specimen.