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Traffic-induced variability in dynamic properties of cable-stayed bridge

机译：交通引起的斜拉桥动力特性变化

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摘要

The traffic-induced variability in the dynamic properties of a cable-stayed bridge is investigated using ambient vibration measurements. Under a relatively steady wind and temperature environment, the ambient vibration test was conducted on the bridge with normal traffic conditions and totally 24 h acceleration response time histories were recorded. These data are divided into 12 sections with each data section containing 2 h measurements. Thereby the modal variability due to changing traffic loading is investigated through post-processing of the data in each section in both amplitude and frequency domains. The result indicates that the natural frequencies of the global modes can exhibit as much as 1% variation within a day. The modal amplitudes of each mode as well as the modal deflection at each measurement position vary insignificantly. The damping ratios however are sensitive to the vibration intensity, especially when the deck vibration exceeds a certain level.
机译：使用环境振动测量来研究斜拉桥的交通特性引起的交通变化。在相对稳定的风和温度环境下，在正常交通条件下对桥梁进行了环境振动测试，并记录了总共24小时的加速响应时间历史。这些数据分为12个部分，每个数据部分包含2小时的测量值。因此，通过对振幅和频域中每个部分中的数据进行后处理，研究了由于交通负载变化引起的模态可变性。结果表明，全局模态的自然频率在一天之内可以显示多达1％的变化。每个模式的模态振幅以及每个测量位置的模式偏差均无明显变化。然而，阻尼比对振动强度敏感，特别是当甲板振动超过一定水平时。

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