基于提高结构隔震率的隔震支座组合布置

Combination arrangement of seismic isolation support based on improving seismic isolation ratio of structure

为解决单一隔震支座的隔震结构在地震作用下水平位移超出最大变形限值的问题,以提高隔震率为目标,设计3种隔震支座不同组合布置方式的3种隔震结构,运用SAP2000有限元软件对其进行动力时程分析。结果表明:隔震支座的组合布置可使结构自振周期明显延长;在设防地震下,水平地震影响系数为0.128<0.4,可降低1度地震作用;在罕遇地震下,层间位移和支座位移均低于规范限值;将铅芯叠层橡胶支座布置于外圈及角部、天然叠层橡胶支座布置于内部的隔震结构隔震率最高。

To solve the issue that the isolation structure with a single isolation support has a horizontal displacement exceeding the maximum deformation limit under earthquake action,3 types of isolation structures with different combination arrangements of 3 types of isolation supports are designed aiming at improving the isolation ratio.The dynamic time history of the isolation structure is analyzed using SAP2000 finite element software.The results show that the natural vibration period of the structure can be extended significantly using the combination arrangement of seismic isolation supports.Under seismic fortification,the horizontal seismic impact coefficient is 0.128<0.4,and the seismic effect is reduced by 1 degree.Under rarely occurred earthquake,both interlayer displacement and support displacement are below the standard limits.The highest isolation ratio appears at the isolation structure with lead core laminated rubber support arranged in the outer ring and corners,and the natural laminated rubber support arranged inside.