Aseismic performance and damage index of pier after chloride ion erosion

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (15) : 263-272.

ZHOU Mi1, ZHANG Yang1, JIANG Yongcun2, ZHU Guoqiang1, LIU Yang1, LAN Fangyan1, WU Jiang3

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Abstract

In order to study the effect of erosion on the performance of steel bar and concrete and the seismic performance of bridge piers. Three groups of 6 large-scale reinforced concrete pier models were designed. And electrochemical accelerated erosion was carried out on the specimens in each group to be eroded by the pier model. Pseudo-static loading tests were carried out on all specimens to compare the seismic performance indexes of pier models with different pier heights and reinforcement ratios before and after erosion. And two two-parameter models, Park-Ang and M-Park, were used to evaluate the seismic damage of piers. The results show that the displacement ductility, lateral load capacity and cumulative hysteretic energy of the corroded specimens are significantly lower than those of the uncorroded specimens. The equivalent viscous damping coefficient of the corroded specimens are greater than that of the non-corroded specimens before the ultimate displacement. erosion significantly increases the seismic damage of piers, increasing to twice that of uneroded piers at the ultimate displacement. Meanwhile, the greater the reinforcement ratio is, the greater the influence of erosion on the seismic damage of piers is.
Keywords：Seismic performance; Earthquake damage; Quasi-static test; Bridge pier; Cumulative dissipated energy; erosion

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Seismic performance / Earthquake damage / Quasi-static test / Bridge pier / Cumulative dissipated energy / erosion

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ZHOU Mi1, ZHANG Yang1, JIANG Yongcun2, ZHU Guoqiang1, LIU Yang1, LAN Fangyan1, WU Jiang3. Aseismic performance and damage index of pier after chloride ion erosion[J]. Journal of Vibration and Shock, 2022, 41(15): 263-272

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