School of Civil Engineering, Central South University, Changsha 410075, China.
Hunan Provincial Key Laboratory of Power Electronics Equipment and Gird, Changsha 410083, China.
Sensors (Basel). 2023 Jun 17;23(12):5675. doi: 10.3390/s23125675.
Cable-stayed bridges have been commonly used on high-speed railways. The design, construction, and maintenance of cable-stayed bridges necessitate an accurate assessment of the cable temperature field. However, the temperature fields of cables have not been well established. Therefore, this research aims to investigate the distribution of the temperature field, the time variability of temperatures, and the representative value of temperature actions in stayed cables. A cable segment experiment, spanning over one year, is conducted near the bridge site. Based on the monitoring temperatures and meteorological data, the distribution of the temperature field is studied, and the time variability of cable temperatures is investigated. The findings show that the temperature distribution is generally uniform along the cross-section without a significant temperature gradient, while the amplitudes of the annual cycle variation and daily cycle variation in temperatures are significant. To accurately determine the temperature deformation of a cable, it is necessary to consider both the daily temperature fluctuations and the annual cycle of uniform temperatures. Then, using the gradient boosted regression trees method, the relationship between the cable temperature and multiple environmental variables is explored, and representative cable uniform temperatures for design are obtained by the extreme value analysis. The presented data and results provide a good basis for the operation and maintenance of in-service long-span cable-stayed bridges.
斜拉桥在高速铁路中得到了广泛应用。斜拉桥的设计、施工和维护需要对斜拉索的温度场进行准确评估。然而，斜拉索的温度场尚未得到很好的确定。因此，本研究旨在调查斜拉索的温度场分布、温度的时变特性以及温度作用的代表值。在桥址附近进行了为期一年的斜拉索节段试验。基于监测的温度和气象数据，研究了温度场的分布，并研究了斜拉索温度的时变特性。研究结果表明，温度分布在横截面上通常是均匀的，没有明显的温度梯度，而温度的年循环变化和日循环变化的幅度很大。为了准确确定斜拉索的温度变形，需要同时考虑日温度波动和均匀温度的年循环。然后，利用梯度提升回归树方法，探讨了斜拉索温度与多个环境变量的关系，并通过极值分析得到了设计用的代表性斜拉索均匀温度。所提供的数据和结果为在役大跨度斜拉桥的运营和维护提供了良好的基础。
