柱顶隔震结构首层柱子设计及动力弹塑性分析

Design and Elastic-plastic Analysis of the Pillars on the First Floor with Isolation Structure on the Top

为方便结构设计人员进行首层柱顶隔震结构首层柱子的设计,以某实际首层柱顶隔震结构教学楼为例,阐述了首层柱子的设计方法。同时,为研究该首层柱顶隔震教学楼在罕遇地震下的工作状态,特别是首层柱子的工作状态,利用Etabs软件,对该教学楼进行了弹性时程分析和动力弹塑性分析,分析表明该柱顶隔震结构在罕遇地震作用下上部结构某些层的层间位移角仍小于或者接近1/550,仅梁端出现塑性绞,隔震效果明显;首层的层间位移角仍小于弹性层间位移角限值,首层柱子底部未出现塑性铰,首层柱子未发生破坏,可以保证该教学楼在大震下实现良好的隔震效果。

In order to guide the design of the first floor pillars in the first layer of isolation structure ,based on a practical school building with this isolation structure ,the design method of the first floor pillars were presented .At the same time , for the study of the working performance of this building ,especially the first floor pillars under rare earthquakes ,Etabs was adopted to conduct the time history analysis and dynamic elastic-plastic analysis .Analysis result showed that the in-terlayer displacement angle of some floors in the upper part of the building under rare earthquakes was still less than or close to 1/550 ,plastic hinge only occurred at the end of the beams ,isolation effect was obvious .The interlayer displace-ment angle of the first floor was less than the elastic limit value of interlayer displacement ;plastic hinge didn’t occur at the bottom of the first floor pillars ;so the pillars were undamaged .So this school building would achieve a better isolation effect during rare earthquakes .