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Dynamic response assessment of tuned mass dampers in a continuous steel box girder based on monitoring data
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DOI：10.1080/15732479.2026.2698066.png)
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Abstract
En 中文
Tuned mass dampers (TMDs) are extensively employed in vibration control of long-span bridges to suppress excessive vibrations. However, their performance may gradually degrade over time in harsh working environments, and thus their dynamic behaviour should be re-evaluated timely. This study focuses on the evaluation of TMDs installed in the Chongqi Bridge, which connects Chongming Island and Qidong City in eastern China. Modal parameters of the main girder are identified by analysing the ambient vibration response of the main girder acquired from the structural health monitoring (SHM) system. An innovative evaluation index of TMD working performance is proposed, and its variation pattern relative to wind speed is investigated. On-site free vibration tests are conducted to obtain frequencies and damping ratios of TMDs, and theoretical performance indices of TMDs are numerically studied by the finite element method (FEM) for comparative analysis. It is demonstrated that the damping ratio of the main girder is significantly higher than the design requirement, confirming the effectiveness of TMDs. Working performance of TMDs can reach the theoretical level at high wind speed, with their evaluation indices consistent with FEM results. Natural frequencies of TMDs could be adjusted to achieve better TMD working performance.
Keywords:
On-site test
damping ratio
finite element method
tuned mass dampers
monitoring data
modal parameter identification
performance index
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