Techno Press

Steel and Composite Structures   Volume 30, Number 2, January25 2019, pages 171-183
Square CFST columns under cyclic load and acid rain attack: Experiments
Fang Yuan, Mengcheng Chen and Hong Huang

Abstract     [Full Text]
    As China's infrastructure continues to grow, concrete filled steel tubular (CFST) structures are attracting increasing interest for use in engineering applications in earthquake prone regions owing to their high section modulus, high strength, and good seismic performance. However, in a corrosive environment, the seismic resistance of the CFST columns may be affected to a certain extent. This study attempts to investigate the mechanical behaviours of square CFST members under both a cyclic load and an acid rain attack. First, the tensile mechanical properties of steel plates with various corrosion rates were tested. Second, a total of 12 columns with different corrosion rates were subjected to a reversed cyclic load and tested. Third, comparisons between the test results and the predicted ultimate strength by using four existing codes were carried out. It was found that the corrosion leads to an evident decrease in yield strength, elastic modulus, and tensile strain capacity of steel plates, and also to a noticeable deterioration in the ultimate strength, ductility, and energy dissipation of the CFST members. A larger axial force ratio leads to a more significant resulting deterioration of the seismic behaviour of the columns. In addition, the losses of both thickness and yield strength of an outer steel tube caused by corrosion should be taken into account when predicting the ultimate strength of corroded CFST columns.
Key Words
    concrete filled steel tubular (CFST) columns; acid rain attack; experiments; cyclic load; seismic performance
Department of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, China.

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