双悬臂状态高墩连续刚构桥的风振及控制研究

高墩连续刚构桥是跨越山谷深壑的主要桥型之一。对于尚未合拢、处于双悬臂状态的连续刚构桥风振效应是其冬季停工期间的应重点考虑的安全问题。通过对双悬臂状态雁宿崖大桥的抖振时程分析,计算了双悬臂状态连续刚构桥在风荷载作用下出现的横桥向振动响应。研究了悬臂长度、风速与横向位移之间的关系,并提出用缆风绳抑制风致振动的措施。分析表明,缆风绳能有效减小双悬臂状态下的连续刚构桥风致振动。

Study on the wind-induced vibration and control of continuous rigid frame bridge with high-pier under double cantilever state

Continuous rigid frame bridge with high-pier is one of the main bridges across the valley and gully. For the continuous rigid frame bridge has not yet been closed and in double cantilever state, the wind-induced vibration is a safety issue that should be especially considered during the winter. So this paper calculates the transverse vibration of the continuous rigid frame bridge under wind load, by analyzing buffeting in time-domain of a continuous rigid frame bridge with large-span and high-pier. At the same time, the relationship between the length of the cantilever, the wind speed and the transverse displacement are studied. Besides, we propose the wind-induced vibration suppression measures by adopting hawser cable. In the end, the analysis shows that the hawser cable can effectively reduce the effect of wind-induced vibration.