STATIC BEHAVIOR OF CORRODED CONCRETE-FILLED STEEL TUBULAR MEMBERS BY SIMULATING ACID RAIN SOLUTION

It discusses the static performance deterioration of corroded concrete-filled steel tubular members by simulating acid rain solution, including:the mechanical properties of corroded steel materials; the axial compressive behavior of corroded concrete-filled steel tubular members; the pure bending mechanical properties of corroded concrete-filled steel tubular members; the eccentric compressive mechanical properties of corroded concrete-filled steel tubular members. The impact of corrosion ratio on the yield strength, elastic modulus, ultimate tensile strength, and ultimate elongation of corroded steel are analyzed. By using wall thickness reduction and wall thickness coupling with material property reduction method to simulate corrosion damage in conjunction with finite element commercial software ABAQUS and design code formulas, the relationships between load and displacement as well as the bearing capacity of corroded concrete-filled steel tubular members are computated. The computational solutions are compared with the test results, implying that the wall thickness reduction method is superior to the wall thickness coupling with material property reduction method, and that the local design code is stricter to the state code.