国家跳台滑雪中心(雪如意)舒适度分析

Comfort analysis of National Ski Jumping Center (Xueruyi)

国家跳台滑雪中心(雪如意)位于山顶,采用预应力钢桁架结构体系,悬挑大、竖向刚度较柔,属于风敏感的结构类型。通过分析不同人员活动工况下悬挑端部的竖向振动加速度响应,对雪如意的振动舒适度进行研究,研究结果表明:大跨整体悬挑结构容易与人员活动产生共振,且越远端的位置竖向振动加速度峰值越大,超出了振动舒适度的加速度限值0.22m/s^(2)。采用了电涡流TMD减振装置并给出了相关参数取值,以减小竖向振动加速度峰值,分析结果表明:电涡流TMD对人员活动的减振效果较好,减振效率可达到50%,对风荷载作用的减振效果次之,减振效率一般难以达到50%;加设电涡流TMD后,竖向振动加速度峰值可以满足振动舒适度的加速度限值0.22m/s^(2)的要求。

National Ski Jumping Center(Xueruyi) is located on the top of the mountain. It adopts a prestressed steel truss structure system with large overhangs and soft vertical stiffness. It is a wind-sensitive structure type. By analyzing the vertical vibration acceleration response of the cantilever end under different personnel activity conditions, the vibration comfort of Xueruyi was studied. The research results show that the large-span overall cantilever structure is prone to resonance with personnel activities, and the farther the position is, the peak value of vertical vibration acceleration response is greater, and the acceleration limit of vibration comfort level of 0.22 m/s^(2) is exceeded. The eddy current tuned mass damper(TMD) vibration reduction device was adopted and the relevant parameters were given to reduce the peak value of vertical vibration acceleration. The analysis results show that the eddy current TMD has better vibration reduction effect on personnel activities, and the vibration reduction efficiency can reach 50%, the vibration reduction effect on wind load is second, and the vibration reduction efficiency is generally difficult to reach 50%. After adding eddy current TMD, the peak value of vertical vibration acceleration can meet the acceleration limit of 0.22 m/s^(2) for vibration comfort.