Ground motion identification of bridge site based on acceleration response monitoring

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (7) : 89-94.

CHEN Taicong, HONG Huihuang

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Abstract

In health monitoring practice of bridge structures, using structural dynamic responses to identify bridge-site’s ground motion is very important for structural safety evaluation. Here, firstly, according to characteristics of bridge site, a non-stationary random process model was chosen to describe ground motion, and the corresponding variance function was derived. Then, a mathematical model was established for the ground motion identification problem. Based on the principle of maximum likelihood estimation, a progressive identification algorithm of real ground motion time history was deduced, in which the sensitivity of acceleration response corresponded to the discretized impulse response function. Taking a 3-span rigid frame bridge subjected to lateral earthquake as a numerical example, the identification effect of the proposed method was examined from two aspects of number of sensors and influence of observation noise. The results showed that the proposed identification method does not require a large number of sensors and has good anti-noise performance. Finally, shaking table tests of structural model was conducted to further verify the effectiveness of the proposed method.

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health monitoring / ground motion identification / acceleration response / maximum likelihood estimation

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CHEN Taicong, HONG Huihuang. Ground motion identification of bridge site based on acceleration response monitoring[J]. Journal of Vibration and Shock, 2021, 40(7): 89-94

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