Controlling the Human-Induced Longitudinal Vibrations of a Nielsen-Truss Footbridge Via the Modification of its Natural Frequencies
Controlling the Human-Induced Longitudinal Vibrations of a Nielsen-Truss Footbridge Via the Modification of its Natural Frequencies
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DOI：
10.1142/s0219455417500614
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发表时间：
2017-08
影响因子：
3.6
通讯作者：
J. Jiménez‐Alonso;A. Sáez
中科院分区：
文献类型：
--
作者：
J. Jiménez‐Alonso;A. Sáez
本文介绍了一个案例研究，其中的人为诱导的振动的人行桥已被控制的方式修改其固有频率。该结构是一个尼尔森可变高度桁架，位于马拉加（西班牙）郊区的一条高速公路上，因此它的设计可以承受低行人密度，其动态行为在建造之日根据西班牙标准进行了分析。然而，附近的一个体育馆的存在引发了意想不到的大量行人流量。这种新的使用条件没有得到适当的预期，导致了显著的纵向振动水平。为了克服这个问题，进行了实验和数值研究，目的是找到一个低成本的解决方案，但仍保持人行桥的美学外观。在这些研究之后，采取了增加其刚度的纠正措施。随后，进行了实验测试和有限元模型调整，以获得：（i）其模型。
This paper describes a case-study where the human-induced vibrations of a footbridge have been controlled by means of the modification of its natural frequencies. The structure, a Nielsen variable depth truss, is located over a highway on the outskirts of Malaga (Spain), so that it was designed to withstand low pedestrian densities and its dynamic behavior was just analyzed according to Spanish standards at the date of construction. However, the presence of a nearby sports pavilion originated unexpected large pedestrian flows. This new service condition was not properly anticipated, leading to significant longitudinal vibration levels. To overcome this problem, experimental and numerical studies were carried out, with the aim of finding a low cost solution that yet maintained the footbridge aesthetic appearance. Following these studies, corrective measures that increased its stiffness were then adopted. Subsequently, experimental tests and a finite element model tuning were performed to obtain: (i) its mo...