Study On Dynamic Response Of Subway Superstructure With 3D Friction Pendulum Isolation Bearing

As one of the most important means of transportation to alleviate urban traffic congestion,subway brings great convenience to people’s life.Vibration and noise pollution will occur during the operation of the subway,which has a negative impact on the buildings and residents along the line.Adverse effects caused by subway vibration problems include reduced building comfort,affecting human health and the use of sensitive equipment,and even threatening structural safety.Therefore,how to effectively reduce and eliminate such environmental impact has become a key issue in property development of Metro covers.Therefore,this paper focuses on the vibration isolation of the subway upper cover and buildings along the line,and proposes a ring spring-friction pendulum three-dimensional vibration isolation support for the control of both subway vibration and ground vibration sources,which can isolate the building structure with its three-dimensional damping capacity and self-resetting function.The main contents and conclusions of this paper are as follows:(1)Based on the respective vibration isolation advantages of friction pendulum mount and ring spring,a ring spring-friction pendulum three-dimensional vibration isolation mount composed of the two in series is proposed,and its construction and working principle are introduced in detail.The mechanical model of the bearing is established by theoretical analysis and the motion equation of the isolation structure with ring spring-friction pendulum three-dimensional isolation bearing is derived.(2)Finite element model of ring spring-friction pendulum three-dimensional isolation support was established by ABAQUS,and its main mechanical properties were analyzed by parameters.The influence of friction slide radius,friction coefficient of friction pendulum,horizontal displacement amplitude and vertical pressure on the horizontal mechanical properties of the support was analyzed.The influence of ring spring angle(cone angle),ring spring friction coefficient,vertical displacement amplitude and vertical preload on the vertical mechanical properties of the support is analyzed.The analysis results show that the support has good hysteresis performance,and the friction coefficient of friction pendulum and ring spring has relatively large influence on the energy consumption capacity of the support.(3)Taking six-storey reinforced concrete frame structure as an example,the seismic isolation effect of ring spring-friction pendulum three-dimensional isolation support under rare earthquakes is studied by mode analysis and seismic response time-history analysis.The calculation results show that the setting of ring spring-friction pendulum three-dimensional vibration isolation support can significantly increase the natural vibration period of the structure,significantly reduce the inter-story displacement of the frame structure,effectively control the axial force of the angle column and the inter-story shear force,and have a good damping effect.(4)In order to evaluate the vibration isolation effect of three-dimensional ring spring-friction pendulum isolation bearing on subway vibration excitation,ABAQUS is used to input the frame structure model into the typical vertical ground vibration excitation along the subway line,and the dynamic response results of the vibration isolation structure and non-vibration isolation structure under the excitation of subway vibration are compared and analyzed,and compared with the relevant standards at home and abroad.The results show that the support can effectively reduce the acceleration response of each floor of the frame structure,reduce the vibration level of the frame structure under the influence of subway vibration,and effectively improve the building comfort.