Vertical Mechanical Properties Of Thick Laminated Rubber Bearing And Its Vibration Isolation Effect On Metro Depot Over-track Building

In this paper,the applicability of the improved nonlinear polynomial hysteretic constitutive model to the vertical performance of thick laminated rubber bearing is studied,and the influence of temperature on the vertical stiffness of thick laminated rubber bearing is studied;On the basis of summarizing the evaluation standards of environmental vibration at home and abroad,the measured data and scale model test data of subway vibration are analyzed to study the influence of subway vibration on the vibration of superstructure;Through the numerical model analysis,the vibration isolation effect of the upper cover of Metro Depot with ordinary laminated rubber bearing and thick laminated rubber bearing is analyzed respectively.The results show that the laminated rubber bearing has vibration isolation effect on the medium and high frequency band of vehicle induced vibration,and the thick laminated rubber bearing can expand the effective bandwidth of vibration isolation frequency band.The main contents of this paper are as follows:(1)The applicability of the improved nonlinear polynomial mechanical model to the description of vertical mechanical properties of thick laminated rubber bearings at different temperatures is verified,and the temperature dependence of vertical hysteretic properties and vertical stiffness at different temperatures is completed,The results show that the improved nonlinear polynomial hysteretic model can well fit the test curves of thick laminated rubber bearings at different temperatures,and further verify that the vertical performance of laminated rubber bearings has obvious temperature dependence.The lower the temperature is,the smaller the energy dissipation capacity and the greater the vertical stiffness are.(2)Based on the summary of domestic mainstream environmental vibration evaluation standards,the simulation test of metro vehicle induced environmental vibration based on scale model is completed.Different types of turbine pneumatic vibration exciters are selected to expand the research frequency band of vibration source.The influence of different positions and frequencies of vibration source on buildings is analyzed.The research method of laboratory test is explored for the research of environmental vibration.(3)Through the comparative analysis of the effect of laminated rubber bearing and thick laminated rubber bearing in environmental vibration isolation of an engineering project,the structural response changes of the upper tower before and after vibration isolation are analyzed through two subway building models.It is found that laminated rubber bearing has no vibration isolation effect on metro vehicle induced vibration,and thick laminated rubber bearing has vibration isolation effect in the sensitive frequency band.