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为探讨首层柱顶隔震体系的工程应用,以某首层架空的5层综合楼为背景,进行隔震设计和分析,同时讨论相关的结构、构造设计及工程经济性。时程分析表明:在7度地震作用下,上部结构有显著的减震效果;下部结构(首层独立柱)有增大的结构动力反应。首层独立柱按7度罕遇地震内力进行强度设计,保证了其在罕遇地震下不屈服并具有安全储备。着重讨论了独立柱的设计,表明了独立柱既满足结构安全又不影响架空层的利用。验证了首层为薄弱层的该框架结构应用首层柱顶隔震在技术上可靠,工程经济性上可行。
In order to explore the engineering application of the first floor overhead isolation system, the design and analysis of seismic isolation are carried out with a 5-storey overhead building on the first floor. The related structure, structural design and engineering economy are also discussed. Time-history analysis shows that under the action of 7-degree earthquake, the superstructure has a significant damping effect; and the substructure (the first floor independent column) has an increased structural dynamic response. The strength of the first-floor independent column is calculated by the seismic intensity of rare earthquake of 7 degrees, which ensures that it will not yield under the rare earthquakes and has a safe reserve. The design of individual columns is highlighted, demonstrating that independent columns satisfy structural safety without affecting the utilization of the suspended layer. It is verified that the application of the first-floor pillar-top seismic isolation of the frame structure with the first layer as the weak layer is technically reliable and the engineering economy feasible.