首页> 外文期刊>Structure and Infrastructure Engineering >Rain-wind-induced cable vibrations in the Alamillo cable-stayed bridge (Sevilla, Spain). Assessment and remedial action
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Rain-wind-induced cable vibrations in the Alamillo cable-stayed bridge (Sevilla, Spain). Assessment and remedial action

机译:雨风在阿拉米洛斜拉桥(西班牙塞维利亚)中引起的电缆振动。评估和补救措施

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摘要

Rain combined with wind action provoking vibration has been observed in the longest stays of the Alamillo cablestayed bridge in Sevilla (Spain). The maximum displacements observed are in the order of magnitude of 0.5 m and have caused discomfort problems to the pedestrian circulation across the bridge. The paper shows the analytical and experimental studies carried out to analyse the possible solutions and also the steps developed to stop the vibration phenomenon. In 2004, a dynamic test in the cables was envisaged to measure the actual damping in the cables. It became clear that damping in the cables was very low and the solution required the installation of dampers. The damping devices had to be in accordance with the relevant aesthetic constraints of the structure. The installation of the damping devices took place during 2007. After the installation of the damping devices, a new dynamic test was carried out in February of 2008 to check if the level of damping introduced by the dampers was appropriate. During the tests performed in 2004, the natural frequencies of vibration were also obtained at the same time than damping. The comparison between the two sets of natural frequencies (1992 and 2004) allow to extract important conclusions about the correct performance and condition state of the bridge as well as the evolution of forces in the cables after 12 years of construction due to creep in the tower.
机译:在塞维利亚(西班牙)的阿拉米洛斜拉桥最长的停留过程中,观察到雨水和引起振动的振动。所观察到的最大位移约为0.5 m,已对跨桥的行人流通造成不适感。本文显示了进行分析和实验研究以分析可能的解决方案,以及为制止振动现象而开发的步骤。 2004年,对电缆进行了动态测试,以测量电缆的实际阻尼。很明显,电缆中的阻尼非常低,解决方案需要安装阻尼器。减震装置必须符合结构的相关美学限制。阻尼装置的安装于2007年进行。阻尼装置安装后,于2008年2月进行了新的动态测试,以检查阻尼器引入的阻尼水平是否合适。在2004年进行的测试中,除阻尼外,还同时获得了振动的固有频率。两组固有频率(1992年和2004年)之间的比较可以得出有关桥梁正确性能和状态的正确结论,以及由于塔架蠕变12年施工后电缆中力的演变的重要结论。 。

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