基于层间有害位移的黏滞阻尼器配置

Allocation of Viscous Dampers Based on the Harmful Inter-story Drift

高层建筑的水平层间位移中包含着有害位移和无害位移两部分,且在结构上部往往是后者比例大于前者。结构层间设置的消能支撑耗能特性只取决于有害位移,这就导致快速估算由该层竖向构件的弯曲和剪切变形引起的有害位移显得很有意义。就此提出了一种高层建筑结构在地震作用下层间水平变形有害位移简便计算方法,据此讨论了高层建筑结构层间优化配置黏滞阻尼器问题。通过找出水平地震作用下高层建筑每层的有害位移,根据减震结构的层间位移减小需求目标估算结构所需的附加阻尼比,进而得到需要的层间阻尼力,据此来确定阻尼器的参数和数量。运用该方法对一幢经历东日本311大地震且有时程记录的日本高层钢结构,进行了优化配置层间黏滞阻尼器减震分析,以此验证本文建议方法的有效性。

The story drift of high-rise buildings includes harmful displacement and harmless displacement. The dissipation braces are effective to the harmful part. So it~ meaningful to rapidly estimate harmful displace- ment caused by the bending and shear deformation. This paper proposed a simplified calculation method of harmful displacement in high-rise structures and it studied optimal allocation of viscous dampers based on the harmful displacement. Using this method, the optimal allocation of placing viscous dampers in high-rise build- ing was realized. Based on the target value of inter-story drift, the additional damping ratio that the structure required can be estimated using this method. Furthermore, the total number of dampers on each level and the damping parameters can be determined according to the desired inter-story damping force. Finally, this meth- od has been verified using a series of seismic analysis on a 29-storey steel structure based on the time-history records during the East Japan 311 Earthquake.