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Vibration Mitigation of Traffic Signal Support Structures – Strut versus Signal Head Vibration Absorber

机译:交通信号支撑结构的减振–支撑杆与信号头减振器

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Over the years, a number of cantilevered traffic signal support structures (traffic poles) havecollapsed as a result of fatigue failure of the mast arm and vertical pole connection. Due todynamic wind loading, excessive and sustained vibrations have led to the fatigue cracking andsubsequent collapse. A number of different methods have been suggested to reduce theexcessive wind induced vibration of traffic poles, including struts and vibration absorbers. TheSignal Head Vibration Absorber (SHVA), developed at the University of Connecticut, is apromising type of vibration absorber for traffic signal support structures. This device hasexperimentally shown to increase the critical damping of the traffic signal structures to 10.1%,eliminating any steady state deflection, and protecting the structure from fatigue damage. InSouth Korea, where the cantilevered traffic poles are shorter and lighter, struts connected at anangle between the pole and mast arm are used exclusively throughout the country to reducevibrations. The shorter mast arm length, coupled with the use of a strut, made the structureslighter than average poles in the United States. This paper explores the potential benefits of usinga SHVA versus a strut to control the vibration of traffic signal support structures. A 55 footAmerican pole is evaluated against a 17 foot Korean pole to examine the potential benefits andrelative merits of these two methods of reducing excessive wind induced vibration of trafficpoles over various traffic pole configurations.
机译:多年来,许多悬臂式交通信号灯支撑结构(交通灯杆) 由于桅杆臂和垂直杆连接的疲劳失效而塌陷。由于 动态风荷载,过度和持续的振动导致疲劳裂纹和 随后崩溃。已经提出了许多不同的方法来减少 过度的风引起交通杆(包括支柱和减震器)的振动。这 康涅狄格大学开发的信号头振动吸收器(SHVA)是一种 用于交通信号灯支撑结构的有希望的减震器。该设备具有 实验表明,可以将交通信号结构的临界阻尼提高到10.1%, 消除任何稳态变形,并保护结构免受疲劳破坏。在 在悬臂交通杆更短,更轻的韩国,支柱连接在 杆和桅杆臂之间的角度仅在全国范围内使用,以减少 振动。较短的桅杆臂长度,再加上使用撑杆,使得这些结构 比美国的电线杆轻。本文探讨了使用的潜在好处 一个SHVA与一个支撑杆来控制交通信号支撑结构的振动。 55英尺 针对美国杆子与17英尺的韩国杆子进行了评估,以检查其潜在收益和 减少过大风引起的交通振动这两种方法的相对优点 各种交通杆配置上的电线杆。

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