Long-term characteristics of damping ratio of the Z24 bridge influenced by different factors

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (14) : 287-295.

SHANG Zhiqiang1,2, XIA Ye3, SUN Limin3,4,5, XIN Gongfeng1,2

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Abstract

To investigate long-term characteristics of damping ratio of Z24 bridge influenced by different factors, a time series semantic segmentation method was introduced to extract free attenuation data segments from monitored acceleration of Z24 bridge. Then, about 10-month damping ratio of 1st vibration mode was calculated using exponential attenuation method. Based on the calculated damping ratio, influences of three factors including temperature, vibration intensity, and structural damage were analyzed. The results show that there exists a strong correlation between the damping ratio of Z24 bridge and temperature variation. Specifically, the damping ratio exhibits an increasing trend followed by a decreasing trend after the temperature drops below 0℃, while the damping ratio exhibits a linearly decreasing trend after the temperature goes beyond 0℃, in which time the correlation coefficient even reaches 0.98. The vibration intensity presents little impact on the damping ratio under both of the excitation of vehicles passing below the bridge and the excitation of drop weight on the bridge. The structural damage also exhibits very limited influences on the damping ratio, thus further investigation is still required in the future to obtain effective damage features based on the identified damping ratio. The influences of the above factors should be considered in damping ratio-related applications including structural control and damage detection to achieve reasonable and reliable results.

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Z24 bridge / bridge structural health monitoring / exponential attenuation method / damping ratio / influencing factors

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SHANG Zhiqiang1,2, XIA Ye3, SUN Limin3,4,5, XIN Gongfeng1,2. Long-term characteristics of damping ratio of the Z24 bridge influenced by different factors[J]. Journal of Vibration and Shock, 2023, 42(14): 287-295

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