Flexural property of damaged steel-concrete composite girders strengthened with CFRP sheet

This paper presents the flexural property of damaged steel-concrete composite girders strengthened with CFRP sheet or prestressed CFRP sheet. Test and numerical analysis were used in the girders. The test findings indicated that the damage level had a substantial impact on the stiffness, yield strength, and ultimate load. And because of the CFRP sheet or prestressed CFRP sheet, the ultimate bearing capability could increase. The findings of the numerical analysis indicated that the increase of concrete strength would improve the stiffness and bearing capability. Increasing the web’s thickness and the steel beam’s flange by 1 mm would result in an approximate increase in the carrying capacity of roughly 4% and 3.8%, respectively. The damage level had a substantial impact on the stiffness and ultimate bearing capability. The bearing capacity would increase by about 2.8% with each additional 0.05 mm of thickness in the CFRP sheet. When the prestressed degree increased by per 5%, the bearing capacity would experience a 1.4% rise and the CFRP sheet’s stress would increase.