A study on the life prediction of time-varying vehicle-bridge coupling vibrationof reinforced&nbsp; concrete (RC) bridge structures in Salt Lake Area

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (12) : 9-16.

A study on the life prediction of time-varying vehicle-bridge coupling vibrationof reinforced concrete (RC) bridge structures in Salt Lake Area

LI Shuangying1,2,ZHAO Jianchang1

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Abstract

The time-dependent vehicle-bridge coupling vibration of reinforced concrete (RC) bridge structures corroded by chloride attack is a complex multi-factor and seriously non-linear process in Salt Lake regions.The characteristic is gradually enhanced with wind speed and train speed, which results in higher requirement prediction model for life prediction assessment of RC bridge structures.A vehicle-bridge vertical coupled vibration model of RC bridge was established based on the secondary active suspension system.Based on the pseudo-excitation method, the vertical vibration displacement of the train at different running speed was solved, and the influence factors of load f(δ) were determined by the displacement and the energy conservation law.Based on the theory of the Fick second diffusion law, the time dependence of chloride diffusivity of concrete, the influence of track irregularity excitation and the running speed of high-speed train on the vertical vibration of RC railway bridge members were fully considered.Therefore, a modified model for the chloride diffusion of RC bridge was established, which considers both the influence factor of load f(δ) and the chloride binding capacity.The simulation results show that compared with the traditional chloride diffusion model without considering the influence factors of train running speed, the modified chloride diffusion model of the RC railway bridge is more reasonable.It is more practical for predicting structural service life of existing RC bridges in the Saline Lake regions.

Key words

Salt Lake regions / RC bridge structure / Chloride / Vertical vibration / Influence factor of load

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LI Shuangying1,2,ZHAO Jianchang1. A study on the life prediction of time-varying vehicle-bridge coupling vibrationof reinforced concrete (RC) bridge structures in Salt Lake Area[J]. Journal of Vibration and Shock, 2019, 38(12): 9-16

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