大底盘双塔结构层间隔震技术的抗震性能分析

Seismic Performance Analysis of Story Isolated Twin Tower Structure with Large Base

大底盘双塔结构在地震时底盘与上部塔楼连接处的薄弱层易遭到破坏。为解决竖向刚度不均匀造成的地震破坏,采用层间隔震技术,在大底盘与上部塔楼之间设置隔震层,减小传入上部结构的地震作用。运用SAP2000有限元分析软件,建立层间隔震结构和非隔震结构模型,对其进行时程分析。结果表明:隔震结构的加速度幅值,层间位移,底部剪力都相应地减小;隔震结构的变形主要由隔震层承担,隔震结构加速度和层间位移在隔震层处达到最大值,层间剪力在隔震层处大幅度减小,起到了相应的隔震效果,为工程实际提供了理论依据。

The joint of the upper tower and the chassis belongs to twin-towers with large base can form weak layer,which is easy to damaged during the seismic. Large chassis structure of the twin towers was researched in order to solve the earthquake damage caused by vertical stiffness. The interval seismic technology setting isolation layer between the chassis and the upper towers was used in order to decrease the energy transferred to the upper structure. Using finite element analysis software SAP2000,the structure model with the non-isolated and the isolated structure were established to conduct time-procedure analysis. The conclusion shows that： acceleration amplitude,interlayer displacement and bottom shear of the structure are decreased. The deformation of isolated strcutre is absorbed by isolation layer. The amplitude and interlayer displacement of isolated structure reached maximum at isolated layer and interlayer shear decraesed sharply at isolated layer,which have an effect on isolation. The results provides theory for engineering application.