首层薄弱层框架结构的柱顶隔震性能分析

Performance Analysis of Isolation on the Top of Columns for First-floor Weak Frame-structure

以某首层架空的5层实际框架结构为背景,进行了首层为薄弱层的建筑结构柱顶隔震性能分析。时程分析表明:在7度地震作用下,隔震上部结构减震效果明显;下部结构(独立柱)在8度罕遇地震作用下其变形仍处于弹性阶段,证明了柱顶隔震技术显著地提高了首层薄弱层框架结构的抗震性能,增加了首层的变形能力,改善了首层薄弱的特点。同时分析了独立柱的受力与抗震设计,表明合理的独立柱设计提高了整体结构的地震安全性。

Taking a practical five-story frame-structure as background and the first floor is open;performance a- nalysis for the first-floor weak structure is carried out, on which first-floor isolation technology is applied. Time-histo- ry analyses for the structures showed that vibration reduction effect of the superstructure is obvious under 7 degree earthquakes. The substructure （ independent columns） is still in elastic deformation stage under 8 degree rare earth- quakes, which proved that isolation technology on the top of column could improve the seismic behavior of the first- floor weak frame-structure, increase the deformation capacity of the first floor and change and improve the features of weak story. Meanwhile, mechanical analyses and seismic design of the independent columns are performed. The re- suits indicated that rational design could improve the structure seismic safety.