9度区某复杂高层隔震结构设计

Design of a complex high-rise isolation structure in 9-degree zone

川投西昌综合医院项目位于9度区近断层,建筑体型复杂,上部结构竖向及平面不规则。为提高结构的抗震性能,在基础顶部设置隔震层,隔震层由铅芯橡胶支座、叠层橡胶支座、黏滞阻尼器和弹性滑板支座组成;隔震层以上采用框架-剪力墙结构。介绍了考虑1.5的近场地震增大系数后该工程的结构设计及隔震设计。隔震分析结果表明,结构水平地震减震系数为0.367,上部结构水平地震作用可按降低一度设计;罕遇地震下隔震支座的面压、水平位移等参数能够满足规范要求。结构性能化分析结果表明,隔震后的结构抗震性能得到提高,能满足抗震性能目标C的要求。加强了隔震沟挡土墙的设计,使得高11.7m的悬臂挡土墙满足大震弹性的要求。

Sichuan Investment Xichang General Hospital Project is located in the 9-degree zone near the fault,with complex building shape and irregular vertical and plane.In order to improve the seismic performance of the structure,an isolation layer is set on the top of the foundation,the isolation layer consists of lead rubber bearing,laminated rubber bearing,fluid viscous damper and elastic slide bearing;the frame-shear wall structure is adopted for the structure above the isolation layer.The structural design and isolation design of the project after considering the near-field seismic amplification factor of 1.5 were introduced.The isolation analysis results show the horizontal seismic decrease coefficient is 0.367,so the intensity of horizontal seismic action can reduce 1.0 degree to upper structure;and the parameters such as surface pressure and horizontal displacement of the isolation bearing under the rare earthquake can satisfy requirements of the codes.The performance-based analysis results show that the seismic behavior of structure is improved by isolation and can meet requirements of seismic performance objectives C.The design of the isolation ditch retaining soil wall was strengthened,so that the cantilever retaining soil wall with a height of 11.7 meters can meet the elasticity requirements of rare earthquake.