Meso numerical study on dynamic anti-bending performance of corroded RC beam

ZHANG Renbo1,2, YANG Hongshen1, JIN Liu1, DENG Xiaofang1, DU Xiuli1

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 77-85.

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 77-85.

Meso numerical study on dynamic anti-bending performance of corroded RC beam

  • ZHANG Renbo1,2, YANG Hongshen1, JIN Liu1, DENG Xiaofang1, DU Xiuli1
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Abstract

In order to explore the corrosion effects on the dynamic behavior of reinforced concrete (RC) beams, a two-stage three-dimensional mesoscale numerical model considering rebar corrosion, strain rate effects and the heterogeneity of concrete materials was established. The non-uniform radial displacement was applied to concrete around the rebar to simulate the expansion of the corrosion products, and the “final state” of concrete cover is taken as the “initial input condition” for the dynamic loading simulation,so as to obtain the dynamic flexural behavior of the corroded RC beams. After verifying the rationality of the numerical model, the cracking behavior of the cover and the mechanical performance of corroded RC beams subjected to dynamic loading with different strain rates were analyzed. The results indicate that rebar corrosion causes the longitudinal cracks on protective layer and the reduction of the bearing capacity. The punching-shear failure occurs and the bearing capacity is also significantly improved for the beams under high strain rate. The loss of bearing capacity is approximately linear with the reduction of frequency (stiffness loss) of corroded beams, and the bearing capacity of beams under low strain rate is more sensitive to the variation of frequency. Finally, based on the regression analysis of the data, a prediction formula was developed for the dynamic flexural capacity of RC beams considering the coupling effects of corrosion and strain rates.

Key words

RC beam / rebar corrosion / flexural capacity / dynamic loading / mesoscopic simulation

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ZHANG Renbo1,2, YANG Hongshen1, JIN Liu1, DENG Xiaofang1, DU Xiuli1. Meso numerical study on dynamic anti-bending performance of corroded RC beam[J]. Journal of Vibration and Shock, 2023, 42(9): 77-85

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