多球面滑动摩擦隔震支座计算模型及其试验确认  

Computational Model and Experimental Validation of Multi-spherical Sliding Friction Isolation Bearings

作　　者：韩强[1] 刘卫刚[1] 杜修力[1] 亓路宽[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《中国公路学报》2012年第5期82-88,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50908005,51178008,50938006);NSFC-JST国际合作项目(51021140003);国家重点基础研究发展计划(“九七三”计划)项目(2011CB013602);北京市自然科学基金项目(8122003);2012年度北京市留学人员科技活动择优资助项目

摘　　要：为了满足近海高烈度区隔震桥梁支座大吨位、大位移和耐久性需求,开发出多球面滑动摩擦隔震支座,阐明了这种隔震支座的构造特点、工作机理和滑动机制,建立了其力-位移关系非线性恢复力模型,进而给出了各滑动面摩擦因数相等时支座的力-位移关系式,并对该支座的力学性能进行了试验研究,对其各摩擦面的滑动顺序机制和非线性恢复力模型进行了试验确认。结果表明:理论分析的支座滑动先后顺序与试验过程中观察到的完全一致,支座试验所得力-位移滞回曲线和理论分析结果十分吻合;此多球面滑动摩擦隔震支座具有良好的耗能能力和足够的水平位移,而且在不同强度的外部激励下表现出刚度和阻尼的自适应性能,适用于多水准地震动下基于性能的隔震桥梁抗震设计。In order to meet the requirement of offshore bridges in highly seismic regions for isolation bearings with large-tonnage load capacity, displacement and durability, a novel multi- spherical sliding friction isolation bearing was developed and its constructional characteristics, working mechanism and sliding mechanism were introduced. A nonlinear restoring model of its force-displacement relationship and the formulas of the relationship with identical coefficient of all friction surfaces were established. A mechanical performance experiment of the bearing was carried out and its sliding sequence of all friction surfaces and its nonlinear restoring model were tested. The results indicate that sliding sequence in theoretical analysis is identical to that in experimental observation and the force-displacement relationships in theoretical analysis and experimental observation are consistent, thus indicating the bearing is of high dissipative energy capacity and enough displacement in earthquakes. The smart stiffness and damping behavior of the bearing under various external intense stimulations is applicable to the performance-based seismic design of bridges at the multiple levels of ground shaking.

关 键 词：桥梁工程 滑动摩擦隔震支座 试验研究 恢复力模型 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]