摘要
位于高烈度区且靠近断层的高层建筑结构,其相关抗震设计需要考虑较大的水平和竖向地震荷载,使得传统、单一的隔震方案难以满足规范的要求。鉴于此,针对西昌市靠近断层的某筒体结构提出了一种叠层橡胶支座加黏滞阻尼器的组合隔震设计方案,即在隔震层布置黏滞阻尼器以控制结构在罕遇地震作用下的位移。与此同时,为了满足结构的功能使用要求,将外部框架以及内部核心筒(除去电梯井)在零标高处进行隔震设计,而电梯井则下沉至基础底部加以隔震。通过弹塑性时程分析,研究结果表明:相比非隔震结构,采取组合隔震设计的框筒结构在设防地震作用下,其X、Y向的最大层间剪力分别减小72.37%和79.63%,水平向减震系数为0.35,满足抗震措施降低一度的要求;在罕遇地震作用下,其X、Y向的最大层间位移角分别减少81.06%和76.38%,隔震橡胶支座的拉压应力均在规范允许范围内,且铅芯橡胶支座与黏滞阻尼器均进入耗能阶段,滞回曲线较为饱满,进而验证了该组合隔震设计的合理性。
High-rise buildings in high-intensity locations and near faults must be designed to withstand massive horizontal and vertical seismic loads,and the usual single isolation plan is impracticable to meet the requirements of code.As a result,this paper proposes a combined isolation design scheme of laminated rubber bearings and viscous dampers for the tube structure of a high-rise building in Xichang City,in which viscous dampers are arranged in the seismic isolation layer to control the displacement of structure during large earthquakes.To meet the functional needs,the external frame and internal tube(excluding the elevator shaft)are seismically isolated at zero elevation,and the elevator shaft is sunk to the bottom of foundation for seismic isolation.Compared to the non-isolated structure,the maximum inter-story shear force in the X and Y directions of the tube structure with combined seismic isolation design decreases by 72.37%and 79.63%,respectively,for large earthquakes.The horizontal damping coefficient is 0.35,which meets the criteria of a one-degree reduction in seismic measurements.The maximum inter-story drift in the X and Y directions is reduced by 81.06%and 76.38%,respectively,when subjected to large earthquakes,and the compression and tension stresses of bearings are all within the limits of specification.Both the lead-core rubber bearing and the viscous damper demonstrate the excellent energy dissipating performance,which validates the rationality of the combined isolation design scheme.
作者
戴君武
庞辉
姜涛
杨永强
柏文
DAI Junwu;PANG Hui;JIANG Tao;YANG Yongqiang;BAI Wen(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2023年第5期90-99,共10页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金青年项目(52208509)
黑龙江省自然科学基金项目(LH2022E121)
中国地震局工程力学研究基本科研业务费专项(2019A03,2022C04)
国家自然科学基金项目(52078471)
内蒙古自治区地震局局长基金项目(2023MS10)
中国地震局创新团队发展计划项目。
关键词
高烈度区
靠近断层
筒体结构
组合隔震设计
high-intensity
near faults
tube structure
combined isolation design
