Test study on seismic behavior of single-sided corroded RC columns

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (5) : 197-206.

EARTHQUAKE SCIENCE AND STRUCTURE SEISMIC RESILIENCE

Test study on seismic behavior of single-sided corroded RC columns

LIU Xiaojuan1,2, HUANG Zhexuan2, LIU Yang*1,2, GUO Zixiong1,2, JIANG Huanjun3, CHEN Yujie2

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Abstract

Due to the influence of external environment, the steel corrosion ratio in the reinforced concrete (RC) column is often inconsistent, and the influence mechanism of tensile and compressive longitudinal reinforcement corrosion on the compressive-flexural performance of RC columns is also different. Quasi-static loading tests were carried out on 1 uncorroded RC column and 5 corroded RC columns to investigate the effect of longitudinal reinforcement corrosion on the seismic performance of RC columns. The effect of corrosion ratio of steel reinforcement, corrosion location and axial compression ratio on the seismic behavior of RC columns were analyzed. The results show that the damage distribution and mechanical properties of RC columns with corroded longitudinal reinforcements in single side are asymmetrical. For the RC column with axial compressive ratio of 0.1, the fracture of corroded tensile longitudinal reinforcement is the main reason for the mechanical degradation of the column, while for RC columns with large axial compressive ratio, the compressive damage of corrosive concrete and the buckling of corroded compressive longitudinal reinforcement are the main causes of mechanical performance deterioration of the column. Compared with the uncorroded RC column, the positive loading capacity of the columns corroded with corrosion ratio of longitudinal reinforcement in single side not exceeding 15% decreased by less than 10%, the reverse loading capacity decreased by less than 5%, and the cumulative energy consumption at ultimate limit state decreased by about 6.48% to 15.21%. In comparing with the load-carrying capacity and energy dissipation capacity, the deformation capacity of RC columns is effected by the reinforcement corrosion the most significantly. With the increase of steel corrosion ratio, the proportion of bending deformation of RC columns decreases, and the proportion of shear deformation and slip deformation increases. For the column with tensile longitudinal reinforcement premature fracture due to corrosion, the positive limit deformation decreased by about 30% to 37%, while the reverse limit deformation is reduced by about 10%~17%. The seismic evaluation of corroded RC columns should properly consider the non-uniformity corrosion of tensile and compressive longitudinal reinforcement in the column.

Key words

corroded RC column / seismic behavior / steel corrosion in single side / corrosion ratio / axial compressive ratio

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LIU Xiaojuan1, 2, HUANG Zhexuan2, LIU Yang1, 2, GUO Zixiong1, 2, JIANG Huanjun3, CHEN Yujie2. Test study on seismic behavior of single-sided corroded RC columns[J]. Journal of Vibration and Shock, 2025, 44(5): 197-206

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