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首页> 外文会议>IMAC Conference on Structural Dynamics >Temperature and Traffic Load Effects on Modal Frequency for a Permanently Monitored Bridge
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Temperature and Traffic Load Effects on Modal Frequency for a Permanently Monitored Bridge

机译：对永久监控桥梁的模态频率的温度和交通负荷效应

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Many of the damage detection techniques available compare measured parameters of a structure in a known, reference state to an unknown, possibly damaged state. In the case where the measured parameters are the modal characteristics of the structure, it has been shown that these can be sensitive to changes other than damage, such as temperature. Therefore it is useful to install permanent monitoring systems that can track normal changes in measured modal characteristics. The Ironworkers Memorial Second Narrows Crossing, in Vancouver, Canada, had a permanent monitoring system installed in 2011. The purpose of the system is to monitor the response of the bridge during seismic and other potentially damaging events, and to perform long term performance monitoring. During an assessment of the modal parameters it was observed that there is a regular fluctuation in the measured frequencies, so a detailed study on a 17-day segment of continuous data was performed. Analysis was performed on both temperature data and acceleration amplitude (to represent traffic on the bridge). The modal fluctuations were very regular, with maximum at night and minimums in the day, which correlated well with the maximum traffic in the day and minimums at night. The temperature fluctuations coincided with daily changes but had a more variable pattern, which was not directly correlated to changes in frequency. It is also observed that the traffic load on the bridge amplifies the response of the first vertical mode seven and ten times during daytime weekdays and daytime weekends, respectively whereas the first torsional mode of the structure amplifies 5.5 and 4 times in daytime weekdays and weekends, respectively.
机译：许多损坏检测技术可用，将所知道的参考状态的结构的测量参数与未知，可能损坏的状态进行比较。在测量参数是结构的模态特性的情况下，已经证明这些可以对除损坏之外的变化（例如温度）敏感。因此，安装可以跟踪测量模态特性的正常变化的永久监控系统是有用的。 Ironworkers Memorial Sharted Shartows Carrow，加拿大温哥华，在2011年安装了永久监控系统。该系统的目的是监控地震和其他潜在损坏事件期间桥梁的响应，并进行长期性能监测。在评估模态参数期间，观察到在测量的频率下存在常规波动，因此执行对17天的连续数据段的详细研究。对温度数据和加速度幅度进行分析（表示桥上的流量）。模态波动是非常规律的，当天的夜间最多和最低限度，这与当天的最大交通和晚上最小的流量相关。温度波动与日常变化吻合，但具有更具可变模式，其与频率的变化没有直接相关。还观察到，桥上的交通负荷分别在白天平日和白天周末的第一垂直模式七和十次的响应放大了第一垂直模式和白天周末的响应，而该结构的第一个扭转模式放大了白天平日和周末的第5.5和4次，分别。

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