变频变摩擦的摩擦摆隔震支座力学性能
Mechanical behavior of friction pendulum bearing with variable frequency and friction
尚继英 1谭平 2韩建平 1杨奎 2黎庭州3
作者信息
- 1. 兰州理工大学土木工程学院,甘肃兰州 730050
- 2. 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
- 3. 震安科技股份有限公司,云南昆明 650200
- 折叠
摘要
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％.
Abstract
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.
关键词
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Key words
isolation bearing/variable frequency and friction/constitutive relationship model/finite element model/hysteresis characteristics/mechanical behavior引用本文复制引用
基金项目
国家重点研发计划(2021YFC3100700)
国家自然科学基金项目(51978185)
教育部创新团队项目(IRT13057)
甘肃省重点研发计划(22YF7GA161)
出版年
2024
国家科技期刊平台
NSTL
万方数据