设置非等截面TLCD高层建筑在风荷载作用下减振分析

Vibration reduction of high-rise buildings with converted TLCD acted by wind load

为了分析非等截面液柱式调谐阻尼器(TLCD)在高层建筑上对脉动风荷载减振的有效性,采用随机振动理论计算结构响应来获得分析数据.建立设有非等截面TLCD高层结构的运动方程,给出变截面TLCD阻尼等效线性化后的主结构传递函数封闭解,分析系统各参数变化对减振效果的影响,并进行优化分析.结果表明:水箱液体质量和结构一阶广义质量的比值越大,减振效果越好,横竖管的长度比也有同样规律;但随着水头损失系数和竖横管面积比的增长使减振效果先增后减.一般而言TLCD频率和主结构基频接近时能达到最优减振率.在实际应用中建议将TLCD安装在轻柔和小阻尼的结构上以获得理想的效果.

In order to analyze the vibration reduction availability of the converted tuned liquid column damper（TLCD） installed on high-rise buildings acted by fluctuating wind load, random vibration theory was used to calculate the structure response to get analytical data. The dynamic equations of high-rise building with converted TLCD were established, and the closed form solution of transfer function about the structure was obtained by linearization of the damping item of the converted TLCD. The parameters of the converted TLCD and the structure were analyzed and optimized for vibration reduction. The results show that the damping effect increases with the ratio of mass of liquid in tank and first order generalized mass of structure. The ratio of length between vertical pipe and horizontal pipe has the same trend. But the damping effect is changed from increasing to decreasing with the ratio of pipes＇ section area and the head loss coefficient increasing. In general, the optimal solution can be obtained as the frequency of the TLCD is close to fundamental frequency of the structure. It is suggested to install converted TLCD on slender high-rise buildings with little inherent damping to reach perfect effect.