大跨度索穹顶结构半主动振动控制分析

Analysis on semi-active vibration control of large-span cable dome structures

为了实现大跨空间结构半主动振动控制,提出了一种基于模糊控制算法的半主动振动控制方法.以某体育馆大跨度索穹顶屋盖为分析对象,建立了基于台站与地震信息的地震动记录选择集,采用研发的新型压电摩擦阻尼器,开展索穹顶结构被动控制研究.将地面加速度和结构变形量2个指标作为控制参数,进行索穹顶结构半主动振动控制分析.结果表明:被动控制时不同地震动强度下结构峰值加速度、最大相对变形量的最小减振率平均值仅分别为3.7%和-1.6%;半主动控制下的压电摩擦阻尼器能够适应不同强度地震动,有效降低结构的峰值加速度和峰值位移,且峰值加速度减振率平均值为20.0%~41.9%,最大相对变形量减振率平均值为12.0%~19.0%.

To realize the semi-active vibration control of large-span spatial structures,a semi-active vibration control method based on fuzzy control algorithm was proposed.A large-span cable dome roof of a gymnasium was taken as the analysis object,and a selection set of the ground motion records based on station and seismic information was established.Passive control investigation of the cable dome structure was conducted using a new piezoelectric friction damper(PFD).The semi-active vibration control study of the cable dome structure was conducted by taking two indexes,the ground acceleration and the structural deformation,as the control parameters.The results show that the average minimum vibration reduction rates of the peak acceleration and the peak relative deformation of the structure under passive control at different ground motion intensities are 3.7%and-1.6%,respectively.The PFD under the semi-active control can adapt to different intensities of ground vibration,and can effectively reduce the peak acceleration and the peak displacement of the structure.The average peak acceleration vibration reduction rates are 20.0%to 41.9%,and the average peak relative deformation vibration reduction rates are 12.0%to 19.0%.