摘要
为解决基底隔震结构的隔震层附加抗风装置在强震作用下的损伤和失效问题,提出啮式抗风装置。在较低荷载水平(风振或多遇地震作用)下,啮式抗风装置通过上下部元件的弹性啮合为隔震层提供附加水平刚度;当荷载超越设定阈值(罕遇及极罕遇地震作用)后,装置自动脱啮,不再提供水平刚度。装置脱啮过程不涉及元件损伤和失效,脱啮元件在震后可经简单复位回到啮合状态。建立了啮式抗风装置的力学模型并进行了装置的拟静力剪切试验。结果表明:试验荷载-位移曲线与理论曲线吻合良好,啮式抗风装置可实现预定荷载作用下的啮合和超载状态下的脱啮;脱啮装置复位至啮合状态后,其力学性能基本不变;约束组件中导筒抗侧刚度、底板抗弯刚度和啮合元件的材料硬度是保障啮式抗风装置力学性能的关键因素。对安装啮式抗风装置的基底隔震结构简化模型进行风荷载及地震作用下的动力分析,结果表明,啮式抗风装置可有效控制结构风振加速度,同时基本不影响结构在罕遇及极罕遇地震作用下的隔震效果。
To prevent the damage/failure of the additional wind-resisting device in the isolation layer of the base isolation structure under medium/large earthquakes,a detailed configuration of a meshing-type device was proposed.Under small loads(wind&frequent earthquake),the device provides additional stiffness through the elastic meshing of its upper and lower components;when the load exceeds a threshold(rare and very rare earthquakes),the device automatically disengages and no longer provides stiffness.The disengaging process is non-destructive,and the device can be easily reset to the engaged state after a seismic event.The mechanical model of the meshing device was established,and quasi-static shear tests were conducted.The results show that the experimental load-displacement curve aligns with the theoretical one,and the device keeps engaging under designated loads and disengages under excessive loads.The re-engaged device exhibits almost identical mechanical properties with its initial engaging counterpart.The horizontal stiffness of the constraint components and the material hardness of the meshing elements are two key factors in ensuring the mechanical performance of the meshing device.The wind/earthquake-induced dynamic response of a simplified base isolated structural model equipped with the meshing device was analyzed.Results show that the meshing devices can effectively control the wind-induced acceleration without affecting the base-isolation performance of the structure under rare and very rare earthquakes.
作者
相阳
徐奎元
李国强
XIANG Yang;XU Kuiyuan;LI Guoqiang(Department of Structural Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Tongji-CSCEC-Lanke Collaborating Research Center for Metallic Damper Technologies,Shanghai 200092,China)
出处
《建筑结构学报》
北大核心
2025年第11期250-261,共12页
Journal of Building Structures
基金
国家自然科学基金项目(52308524)
国家重点研发计划(2023YFC3806602)。
关键词
基底隔震结构
啮式抗风装置
附加刚度
力学模型
剪切试验
风振控制
base-isolatedstructure
meshing-typewind-resistantdevice
additionalstiffness
mechanicalmodel
shear test
wind-induced vibration control
