颗粒阻尼器布置方案对其减震效果影响研究

Influences of the layout scheme of particle dampers on its vibration control effect

为明晰建筑结构用颗粒阻尼器布置方案对其减震控制效果的影响规律。以某1∶30比例缩尺钢筋混凝土框架结构为研究对象,设计制作了可用于缩尺模型的刚性连接颗粒阻尼器,结合建筑结构减震需求,对颗粒阻尼器的布置方案进行了设计,通过振动台试验研究了布置位置和阻尼器数量等参数对颗粒阻尼器减震控制效果的影响。结果表明:颗粒阻尼器布置位置处的结构均方根位移响应和峰值位移响应均有所降低,阻尼器减震控制效果良好;阻尼器布置位置对颗粒阻尼器减震控制效果影响显著,阻尼器宜布置于结构位移响应较大的位置,合理的阻尼器布置方案能够有效地控制结构的扭转响应;随附加颗粒阻尼器数量的增加,颗粒阻尼器对结构位移响应的减震控制效果提高,建筑结构可用附加质量比范围内,阻尼器布置数量越多,减震控制效果越好。

In order to clear the influence of the layout scheme of particle dampers on its control effect for building structures, a 1/30-scale reinforced concrete frame model was taken as a research object, a kind of particle dampers connected to the scaled model rigidly to reduce the vibration of the model was designed and manufactured, the layout scheme of particle dampers was designed according to the shock absorption requirement of the tested model, and the influence of the layout position and the number of dampers on the control effect was analyzed through a series of shaking table tests. The results show that the root mean square displacement response and peak displacement response of the structure where there is a particle damper are both decreased, and the particle damper designed has a good control effect. The layout position of particle dampers has significant impact on the control effect, particle dampers should be placed on the place where the displacement response is larger, and a reasonable layout scheme of particle dampers can effectively reduce the torsion response of the structure. The vibration control effect on the displacement response increases with the number of particle dampers increasing. In other words, in the available additional mass ratio range for building structures, the control effect increases with the additional mass ratio increasing.