台风下大跨度斜拉桥模态参数变化研究

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中图分类号：U441.3 文献标志码：A DOI： 10.15935/j.cnki.jggcs.202503.0010

AbstractThe dynamic parameters of long-span bridges change significantlyunder typhoon conditions due to their lightweightand flexible characteristics.Analyzing thesevariations helps determine threshold values for the parameters，thereby providing important insights for bridge condition asessment.This study is based on the analysis of health monitoring data collcted over several years from a long-span cable-stayed bridge.The characteristics of the representative typhoon and the trends and causes of parameter changes under typhoon conditions are investigated.Theanalysis employs a rapid Bayesian FFT method developed bytheauthors' team，which allows for theoretical estimation of both the most probable values （MPVs）and posterior uncertainties （c.o.v.s）of modal parameters，enabling a comprehensive evaluation of parameter variations.The results show strong correlations between diferent parameters and typhoon intensity，as well as bridge vibration amplitudes.The dynamic performance of bridges under typhoon conditions differs from their normal operational condition.Therefore，analyzing and adjusting the range of parameter variations during typhoon periods can more accurately and effectively warn bridge anomaly and facilitate rational condition assessment.

Keywordslong-span，cable-stayed bridge，typhoon，health monitoring，performance evaluation

0 引言

在桥梁全寿命周期分析及性能评估中，基于振动的结构健康监测是不可或缺的一部分，不同的参数能够反映结构不同的振动行为，为状态评估提供依据[1-2]。（剩余11199字）