The stress of the main tower of a cable-stayed bridge depends on the connection type between the tower and deck. In order to study the most suitable longitudinal damping mode for a long-span cable-stayed bridge. In this article, a nonlinear finite element model is established based on a large span concrete cable-stayed bridge with a main span of 680 m. Without considering the influence of the transverse constraint, the damping effect of the elastic connection device and the viscous damper is simulated when the longitudinal seismic load is input. The results show that the stiffness of the main beam is increased by installing the elastic connection device, so the longitudinal drift frequency of the main beam is increased, but the stiffness of the structure is not changed by installing the viscous damper. Both viscous dampers and elastic connection structures can reduce the longitudinal displacement of the beam end, but viscous dampers are more favorable for the stress of the main tower. In terms of damping effect, viscous dampers are more suitable for long-span cable-stayed bridges, but, in terms of economy and parameter control, elastic connection devices have more advantages.

中文翻译：

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两种约束系统的大跨度塔桥的地震响应缓解

斜拉桥主塔的应力取决于塔与甲板之间的连接类型。为了研究大跨度斜拉桥最合适的纵向阻尼模式。本文基于主跨为680 m的大跨度混凝土斜拉桥建立了非线性有限元模型。在不考虑横向约束的影响的情况下，当输入纵向地震荷载时，模拟了弹性连接装置和粘性阻尼器的阻尼效果。结果表明，通过安装弹性连接装置可以增加主梁的刚度，从而增加了主梁的纵向漂移频率，但通过安装粘性阻尼器不会改变结构的刚度。粘性阻尼器和弹性连接结构都可以减小梁端的纵向位移，但是粘性阻尼器更有利于主塔的应力。就阻尼效果而言，粘性阻尼器更适用于大跨度斜拉桥，但就经济性和参数控制而言，弹性连接装置具有更多优势。