摩擦摆隔震支座阻尼特性研究

采用有限元软件ABAQUS建立摩擦摆隔震支座(FPB)的实体模型,研究了在拟静态加载条件下,摩擦摆支座的几何参数对其刚度和耗能情况的影响规律。在使用等效线性化方法时,由于摩擦摆支座的位移情况受输入烈度和自身参数影响较大,故计算等效线性化参数时,选取合适的位移值对得到准确的结果十分重要。通过对比非线性时程分析与等效线性化的计算结果,分析各参数支座在不同激励下的响应,得出等效阻尼比超过30%的支座不宜进行等效线性化。

Research on Damping Characteristics of Vibration-isolation Bearing with Friction Pendulum

By using FEM software named ABAQUS to establish a solid model of friction pendulum bearings,this paper studies the hysteresis curve of stiffness and energy consumption in the quasi-static loading conditions when the geometric parameters change individually.The displacement of FPB is impacted by the input excitation and their parameters with equivalent linear method.In order to calculate equivalent linear parameters,it is very important to select the appropriate displacement and get accurate results.Based on the result comparison between nonlinear analysis and equivalent linearization,this paper concludes that the friction pendulum bearings whose proposed equivalent damping ratio in the actual project is more than 30% should not be suitable for equivalent linearization when each parameter bearing responses in different excitation.