增层框架结构抗震性能研究

为了研究增层改造后框架结构的抗震性能,本文采用SAP2000软件对直接增层改造结构、增层改造并加固结构和新建六层框架结构进行数值模拟,对比三者的自振周期、基底剪力-顶点位移曲线、楼层位移,得出增层改造并加固结构的周期小于直接增层改造结构,表明对直接增层改造结构的中柱加固后,结构的整体刚度有所提高。同时,在地震作用下,增层改造并加固结构的层间位移较直接增层改造结构小,表明增层改造并加固结构的抗震性能更好。

Study on the Seismic Performance of Storey-Adding Frame Structure

In order to study the seismic behavior of adding layer frame structure,numerical simulation of directly adding layer structure, adding floors reconstruction combined with reinforcement structure and the new built six-story frame structure were made with SAP2000 software. The natural vibration period,base shear-top displacement curve and floor displacement of these three conditions were compared, it can be concluded that the period of adding layer combined with reinforcing structure is less than directly adding layer structure,indicating that overall stiffness of the structure has improved after reinforcement of the middle columns of the directly adding layer structure. While un-der the action of earthquake,layer displacement of adding layer combined with reinforcement structure is less than directly adding layer structure,indicating that adding layer combined with reinforcement has better seismic performance.