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风雨激励下斜拉索的振动对斜拉桥会造成严重的影响,在外部附加阻尼器是一种用来抑制较短斜拉索振动的有效手段。然而,对于较长斜拉索,出于美观要求,阻尼器需要设置在斜拉索的底部,附加阻尼器难以发挥作用。提出一种新的斜拉索隔振系统来减轻斜拉索的振动。隔振系统由隔层橡胶垫块和1个内置阻尼器组成,可安装在斜拉索的锚固端。用具有初应变的单元来表征斜拉索,建立了一个简单的斜拉索-阻尼器系统分析模型,通过计算得到隔振系统下斜拉索的响应,并与设置、未设置外部被动阻尼器时的斜拉索进行了比较。对比显示,提出的斜拉索隔振系统比最优状况下的被动阻尼器减振效果要好,具有更广泛的适用性。
The wind and rain vibration of the stay cable will have a serious impact on the cable-stayed bridge. Attaching the damper externally is an effective way to restrain the vibration of the shorter stay cable. However, for longer stay cables, the damper needs to be placed on the bottom of the stay cable for aesthetic reasons, and the additional damper is difficult to function. A new cable-stayed vibration isolation system is proposed to reduce the vibration of stay cables. Vibration isolation system consists of a rubber spacer and a built-in damper can be installed in the anchorage end of the stay cable. The cable with initial strain is used to characterize the stay cable. A simple cable-damper system analysis model is established. The response of the stay cable under the vibration isolation system is calculated and compared with the set without external passive damper Diagonal cables were compared. The comparison shows that the proposed cable vibration isolation system has better damping effect than the passive damper under optimal conditions and has a wider applicability.