EXPERIMENTAL RESEARCH AND FINITE ELEMENT ANALYSIS ON ASEISMIC BEHAVIORS OF CORRODED STEEL FRAME COLUMNS

In order to further study the aseismic behaviors of corroded steel frame columns, considering different loading histories and axial compression ratios, the low cyclic loading tests for 6 steel frame column specimens of identical degree corrosion were implemented. The mechanical process and failure pattern of the specimens were observed, and the influence of loading histories and axial compression ratio on aseismic performance of the specimens from the hysteresis curves, skeleton curves, strength and stiffness degradation, energy dissipation perspectives were analyzed. Based on the experiments, nonlinear finite element analyses were conducted on these columns using ABAQUS. The results showed that: the calculation results totally correspond with experimental results; these columns were destroyed with better ductility, and the hysteretic curves were relatively full, indicating good energy dissipation capacity and ductility; loading histories had a greater influence on the development of plastic deformation and energy dissipation capacity of the specimens; with the increase of axial compression ratio, the ultimate bearing capacity and energy dissipation capacity decreased, and the degeneration of the strength and stiffness of the specimens aggravated.