变频变摩擦的摩擦摆隔震支座力学性能OA北大核心CSTPCD

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.