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首页> 外文期刊>Structural engineering international >Enhanced Damping Estimation for Cable-Stayed Bridges Based on Operational Monitoring Data
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Enhanced Damping Estimation for Cable-Stayed Bridges Based on Operational Monitoring Data

机译：基于运营监测数据的斜拉桥阻尼评估

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摘要

This study proposes an enhanced damping estimation procedure for flexible cable-supported bridges based on operational modal analysis (OMA). The OMA approach combines the natural excitation technique (NExT) with an eigensystem realization algorithm (ERA). An amplitude modulating (AM) function is introduced to stationarize the vehicle-induced responses. This study proposes guidelines for the selection of parameters for the NExT-ERA algorithm and AM-based stationarization. The proposed damping estimation procedure and parameter selection guidelines were applied to the data gathered from measuring an in-service cable-stayed bridge over a three-day period. The correlations between the identified damping ratios and environmental factors such as vibration level, temperature and wind velocity were investigated. The effect of aerodynamic damping during OMA is also discussed. The examined data identifies the amplitude-dependency of the damping ratios.
机译：这项研究提出了一种基于操作模态分析（OMA）的增强的柔性电缆支撑桥梁阻尼估计程序。 OMA方法将自然激励技术（NExT）与本征系统实现算法（ERA）相结合。引入了调幅（AM）功能以平稳化车辆引起的响应。这项研究提出了为NExT-ERA算法和基于AM的平稳化选择参数的指南。拟议的阻尼估计程序和参数选择指南应用于在三天内测量在役斜拉桥所收集的数据。研究了确定的阻尼比与环境因素（如振动水平，温度和风速）之间的相关性。还讨论了OMA期间空气动力学阻尼的影响。检查的数据确定阻尼比的幅度相关性。

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