基于SAP2000的轻钢加层结构的抗震性能分析

Analysis of Seismic Performance of the Storey-adding Structures of Light-weight Steel Based on SAP2000

采用轻钢结构加层后,结构的整体质量、刚度、周期、阻尼比等均发生了较大的变化,仅对加层部分结构进行计算分析是不安全的,应进行结构的整体分析。本文采用有限元软件SAP2000,结合具体工程对钢筋混凝土框架结构直接采用轻钢结构加层建立了三维有限元模型,对4层、5层、6层钢筋混凝土框架分别加一层、两层轻钢结构的抗震性能进行了模态分析和反应谱分析,得到了该类结构的地震反应特点,为加层结构的抗震设计提供了一些理论参考。

Significant differences occur in the mass, stiffness, period and damping ratio after adding light-weight steel storeys on the top of the original building. It is necessary to analyze the integral structure due to the unreliability of calculating the adding storeys independently. In this paper, a three-dimensional adding steel storeys on top of the reinforced concrete frame structure is made by finite element analysis software SAP2000. The seismic performance includes adding one or two storeys light-weight steel frame on four-storey, five-storey, and six-storey by using modal analysis method and response spectrum method is analyzed. In addition, it got the seismic response features about storey-adding of light-weight steel structure, and it offers theoretical reference on the seismic design of adding storey.