Abstract
This paper adopts the method of steel tube wall thickness and strength reduction to simulate corrosion damage. The numerical model of the square concrete-filled steel tube long column (SCFST-LC) under eccentric compression after acid rain corrosion is established in the finite element software, ABAQUS. The reliability and accuracy of the model are verified by comparing it with published relevant experimental results. The failure mode, load-deformation curve, and ultimate compressive load were analysed. Following that, the impacts of section size, yield strength of the steel tube, axial compressive strength of concrete, steel ratio, slenderness ratio, and load eccentricity on its ultimate compressive load are comprehensively investigated. The results demonstrate that the ultimate compressive load of the SCFST-LC decreases significantly with the increase in corrosion rate. The corrosion rate increases from 10 to 40%, and the ultimate bearing capacity decreases by 37.6%. Its ultimate bearing capacity can be enhanced due to the increase in section size, material strength, and steel ratio. In contrast, the ascending slenderness ratio and load eccentricity has harmful effects on the ultimate compressive load of the specimens. Finally, a simplified formula for the axial compressive load of the SCFST-LC under eccentric compression after acid rain corrosion is proposed. The calculation accuracy is high and the deviation of the results is basically within 15%, which is in good agreement with the numerical simulation results.
Highlights
When the concrete-filled steel tube columns are exposed to an acid rain environment for a long time, the external steel tubes will be subjected to severe surface corrosion, which can result in a significant reduction in their mechanical properties [11]
The corrosion damage of concrete-filled steel tubular (CFST) eccentrically loaded long columns after acid rain corrosion was simulated by the method of steel tube wall thickness and strength reduction
The finite element simulation is in good agreement with the formula calculation, which verifies the reliability of the formula
Summary
When the concrete-filled steel tube columns are exposed to an acid rain environment for a long time, the external steel tubes will be subjected to severe surface corrosion, which can result in a significant reduction in their mechanical properties [11]. Those adverse environmental conditions will greatly threaten the safety and durability of concrete-filled steel tube columns. A simplified calculation formula for the bearing capacity of a concrete-filled steel tube short column, corroded by acid rain, was proposed. A parametric analysis is conducted to investigate the importance and effects of its main parameters on the ultimate bearing capacity of the SCFST-LC, under eccentric compression after acid rain corrosion
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