Research On Reinforcing Bridges Strengthened With Carbon Fiber Reinforced Plastic

With the rise on the highway and railway of traffic discharge, the raising of vehicle variety and the growth of wheel load, a higher demand was presented on intensity, rigidity and durability of the existing bridges, and so forth.In our country, most of bridges were built in 1960s or 1970s, which were based on that time traffic discharge and development planning, so design criterion of these bridges were very lower. In addition, it was inevitable to bring about cracks; concrete rupture, steel rust, honeycomb and water proof layer failure, because some established bridges were built by poor construction and maintenance during the course of operating period. All above mentioned lead to durability and bearing capacity couldn't gain to design standard. Maintenance and strengthening must be done on these bridges.Carbon fiber reinforced plastic (CFRP) is used in structure strengthening because of its high strength, low weight, resisting corrupts. Compared with other strengthening method, Carbon fiber reinforced plastic has such benefit as easy to construction, high efficiency, low engineering cost and resisting corrupts and so on. And techniques flow and construction method, which concrete beams strengthened with CFRP are establish.