电磁吸盘-摩擦摆复合隔震支座理论分析与试验研究  

Theoretical analysis and experimental research on electromagnetic chuck-friction pendulum composite isolation system

作　　者：李晓东[1] 翁银绩 陈恩亮 郭明晶 LI Xiao-dong;WENG Yin-ji;CHEN En-liang;GUO Ming-jing(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《振动工程学报》2024年第7期1250-1258,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51968043)。

摘　　要：为解决摩擦摆支座在外部荷载激励下不具备抗拔性的缺点,基于电磁原理和半主动控制思想,提出了一种以电磁力为基础,结合传统摩擦摆的电磁吸盘-摩擦摆复合隔震支座(Electromagnetic Chuck-Friction Pendulum System,ECFPS)。介绍了该复合隔震支座的构造特点和耗能机制,并基于电磁原理推导出电磁吸盘吸力以及ECFPS的等效刚度、周期和等效阻尼比等理论公式,建立了ECFPS计算模型。设计并制作了一个缩尺比为1∶3的ECFPS试件,对不同输入电流、竖向荷载和不同位移幅值下的滞回性能进行了试验研究,探究了不同输入电流对抗拔性能的影响。试验结果表明:理论值与试验值吻合度较高,验证了理论公式推导的正确性;等效刚度和单位循环耗能变化明显,两者最大变化幅度分别为19.81%和28.16%;随着电磁吸盘输入电流的增大,ECFPS支座的抗拔性能提高,实现了支座竖向抗拔的功能。To solve the problem of friction pendulum system without pull-out resistance under external load excitation,based on electromagnetic principles and semi-active control ideas,an electromagnetic chuck friction pendulum composite isolation system(ECFPS)based on electromagnetic force combined with traditional friction pendulum is proposed.The structural characteristics and energy dissipation mechanism of the composite isolation system are introduced,and theoretical formulas for electromagnetic suction force,equivalent stiffness,period,and equivalent damping ratio of ECFPS are derived based on electromagnetic princi⁃ples.The ECFPS model is established.A 1∶3 scaled ECFPS specimen is designed and fabricated to investigate the hysteresis per⁃formance under different input currents,vertical loads,and displacement amplitudes.The effects of different currents on the anti uplift performance are investigated.The experimental results show that the theoretical values are in good agreement with the experi⁃mental values,which verifies the correctness of the theoretical formula derivation.The changes in equivalent stiffness and unit cy⁃cle energy consumption are significant,with the maximum variation amplitude of 19.81%and 28.16%,respectively.As the cur⁃rent of the electromagnetic suction cup increases,the anti pull performance of the ECFPS system improves,achieving the vertical resisting pull function of the system.

关 键 词：隔震 摩擦摆支座 电磁力 滞回性能 竖向抗拔 

分 类 号：TU352.12[建筑科学—结构工程]