Study on Full-scale Bending Experiment of Concrete Girder Reinforced by Steel Plate and Concrete Composite Strengthening Method

摘要

Concrete bridges often have damages after opening to traffic for several years, it is necessary tornreinforce the bridges in order to ensure the safety and extend the service life of the bridges. Thernsteel plate and concrete composite strengthening (SPCCS) is a new retrofit technique, it worksrnthrough welding studs on the reinforcing steel plates, planting steel bars in the original concrete,rnand casting concrete between the original structure and the steel plates, thus the new and existingrnconcrete can work together. The strengthened structure has the advantages of high bearingrncapacity, large stiffness and long term durability. In order to investigate the mechanicalrnperformance of the strengthened bridge, a full-scale damaged box girder released from an actualrnbridge was reinforced by SPCCS technique. The bending resistance test was carried out and therntest results were analyzed in this article. On the basis of the test, the SPCCS technique was appliedrnto reinforce a damaged bridge. From the field test data, it showed that the bend resistance of thernbridge was increased a lot after reinforcement. The SPCCS technique is an effective method tornreinforce the concrete bridge, which can help realizing the sustainable maintenance of the bridge.