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变频变摩擦的摩擦摆隔震支座力学性能

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  • 国家科技期刊平台
  • NETL
  • NSTL
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为了解决传统摩擦摆隔震支座(friction pendulum bearing,FPB)刚度和阻尼特性固定不能适用于更为广泛的地震和结构条件等问题,研发了变频(曲率)变摩擦的摩擦摆隔震支座(friction pendulum bearing with variable frequency and friction,FPB-VFF),其刚度和阻尼特性随支座位移变化.分析了该支座的力学性能和工作原理,推导其理论本构模型和滞回特性参数表达式;建立FPB-VFF 精细化有限元模型,得到其等效刚度、等效阻尼比和耗能等,研究滞回特性随支座参数的变化规律;进行了 FPB-VFF力学性能试验,验证理论分析和有限元模拟的正确性.研究表明:FPB-VFF的等效刚度和耗能随滑移区2摩擦系数线性增加,等效阻尼比随滑移区2的摩擦系数呈反比例函数关系变化;相比FPB,FPB-VFF的等效刚度、耗能和等效阻尼比增大且最大增幅分别为146％、230％和 30％.
Mechanical behavior of friction pendulum bearing with variable frequency and friction
In order to solve the problem that the traditional friction pendulum bearings(FPBs)are inapplicable to a wider range of earthquakes and structures owing to their constant stiffness and damping,a novel friction pendulum bearing with variable frequency and friction(FPB-VFF)is developed,whose stiffness and damping change with isolator displacement.The mechanical behavior and operating principle of the FPB-VFF are analyzed,while its constitutive relationship and expressions of hysteresis parameters are subsequently derived.Creating the finite element model of the FPB-VFF,its effective stiffness,effective damping,and energy dissipation are obtained,and the variation of hysteretic characteristics with bearing parameters was studied.The full-scale component tests of FPB-VFF are conducted to verify the theoretical analysis and finite element modeling.The research shows that the effective stiffness and energy-dissipating capacity of FPB-VFF increases linearly with the friction coefficient of slip zone 2,while the effective damping ratio shows an inverse correlation.Compared with FPB,the effective stiffness,energy-dissipating capacity and effective damping ratio of FPB-VFF increases by 146％,230％and 30％,respectively.

isolation bearingvariable frequency and frictionconstitutive relationship modelfinite element modelhysteresis characteristicsmechanical behavior

尚继英、谭平、韩建平、杨奎、黎庭州

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兰州理工大学土木工程学院,甘肃兰州 730050

广州大学土木工程学院,广东广州 510006

广州大学工程抗震减震与结构安全教育部重点实验室,广东广州 510405

震安科技股份有限公司,云南昆明 650200

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隔震支座 变频变摩擦 本构模型 精细化有限元模型 滞回特性 力学性能

国家重点研发计划国家自然科学基金项目教育部创新团队项目甘肃省重点研发计划

2021YFC310070051978185IRT1305722YF7GA161

2024

10.14006/j.jzjgxb.2023.0129

建筑结构学报
中国建筑学会

建筑结构学报

CSTPCD北大核心
影响因子：1.546
ISSN：1000-6869
年,卷(期)：2024.45(5)
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