The Study Of Corrosion On The Performance Of CFST

Corrosion would impact deformation, capacity and other performance of Concrete-filled Steel Tubular (CFST) structure. Currently there are more research about corrosion of reinforced concrete structures for performance degradation, while the corrosion of Concrete-filled Steel Tubular (CFST) structure is carried out less. In order to more clearly understand regular pattern of Corrosion of the steel tube structure for performance degradation, we use the reduced stiffness of steel, and built steel corrosion model to discuss the impact of the model of two corrosion properties of Concrete-filled Steel Tubular (CFST) structure. The main contents of this article are :Describes the structural characteristics and work of CFST, and summarizes corrosion factors of CFST structures, and generalizes the current commonly used methods of rust and shortcomings of their own. On this basis, it carried out the general corrosion properties of steel members and the law of degradation.Discusses impacts of the corrosion on steel and concrete constitutive relationship and ultimate bearing capacity, and proposes a reduction of elastic modulus to simulate corrosion of steel concrete.Carries out the aspect ratio of the three specifications of steel corrosion in CFST column model (L/D=2, L/D=4, L/D=6) calculated, and obtained the uniform corrosion and corrosion pits two modes Deformation, ultimate bearing capacity.Establishes CFST arch finite element model of the steel corrosion, and combines with corrosion level and its location to carry out the study of corrosion on Arch linear and its ultimate bearing capacity.