Frequency modification of continuous beam bridges based on co-integration theory under effects of temperature and humidity

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (7) : 23-31.

HE Hao-xiang1,2, ZHANG Xiao-fu1, WANG Xiao-bing1

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Abstract

Although there are many literatures about effects of temperature on bridge structures’ frequencies and related statistical methods, few studies reflect dynamic performance and time-varying frequency characteristics of bridge structures under the combined action of multi-environmental factors. Adopting the co-integration theory with the ability to quantify the long term balance relationship among multiple non-stationary sequences, a 3-span RC bridge model under natural environment were monitored and analyzed continuously, a model for long-term balance of temperature-humidity-frequency based on the co-integration theory was established to study the comprehensive effects of temperature and humidity on the bridge’s frequencies. The results demonstrated that the established model has a better fitting precision and a predictive ability, it can fully reflect essential characteristics of influences of temperature and humidity on bridge frequencies; based on this co-integration model, the bridge frequency modification model considering effects of multi-environmental factors is proposed to effectively eliminate effects of temperature and humidity on bridge frequencies, and accurately reveal bridge’s dynamic feature variation due to structures’ internal causes, it can provide effective information for bridge damage diagnosis and safety assessment.

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frequency / co-integration theory / temperature / humidity / reinforced concrete (RC) bridge / structural health monitoring

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HE Hao-xiang1,2, ZHANG Xiao-fu1, WANG Xiao-bing1. Frequency modification of continuous beam bridges based on co-integration theory under effects of temperature and humidity[J]. Journal of Vibration and Shock, 2018, 37(7): 23-31

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