多维地震动作用下摩擦摆基础隔震结构能量反应分析

Energy response analysis for base-isolated structures with a friction pendulum system under multi-axial ground motions

对摩擦摆基础隔震结构进行了能量反应分析,研究了多维地震动、地震烈度和支座摩擦系数对结构能量反应的影响,表明水平双向地震动输入时结构总输入能量明显增大,隔震层滞回耗能比增大,上部结构变形耗能比减小;而竖向地震动的参与使结构总输入能量略有增大,隔震层滞回耗能比减小,上部结构变形耗能比增大;随着地震动强度的提高,结构的总输入能量显著增大,隔震层滞回耗能比增大,上部结构变形耗能比减小;随着支座摩擦系数的增大,结构的总输入能量明显增大,隔震层滞回耗能比减小,上部结构的变形耗能比增大。

The energy response analysis for base-isolated structures with a friction pendulum system（FPS） was carried out,the influence of multi-axial ground motions,seismic intensity and bearing friction coefficient on the energy response was studied.When bilateral horizontal ground motions were considered,the total input energy of the structure and the energy dissipation ratio of the vibration-isolation layer increased,the potential energy dissipation ratio of its upper part decreased.When the vertical ground excitation was considered,the total input energy of the structure and the potential energy dissipation ratio of its upper part increased,the energy dissipation ratio of the vibration-isolation layer decreased.As the seismic intensity increased,the total input energy and the energy dissipation ratio of the vibration-isolation layer increased,the potential energy dissipation ratio of the upper part decreased.As the friction coefficient of the FPS increased,the total input energy and the potential energy dissipation ratio of the upper part increased,and the energy dissipation ratio of the vibration-isolation layer decreased.