Parametric Optimization Design Of Novel Rubber Anti-vibration Bearing For Urban Viaduct

A novel rubber anti-vibration bearing is developed to reduce the environmental vibration caused by train running on the urban rail transit viaduct.This novel bearing that adapts a design of arranging four high damping thick rubber blocks with slope,which could reduce vertical vibration and provide a large horizontal stiffness.It is useful to improve the environmental quality and save the cost for vibration countermeasures.The thick rubber bearing designed for vertical vibration reduction will produce larger deformation under pressure,and the design method of the traditional rubber isolation bearing is no longer applicable.So,the stiffness calculation method of the novel bearing that consists of thick rubber block must be corrected.As a new bridge damping product,its mechanical properties and vibration reduction effects need to be studied.At present,the research on the vibration reduction effect of rubber bearing is either the vertical excitation test on the scale specimen,or let the rubber bearing equivalent to the spring-damping unit,so as to analyze the influence of the vertical stiffness on the bridge vehicle vibration.The former cannot fully reflect the real situation,and the latter cannot consider the effect of the deformation of the rubber.In addition,changing the parameters of the rubber block can design the novel bearing products with different frequencies and bearing capacity.It is necessary to analyze the influence of various parameters on the vibration reduction effect of the novel bearing,and put forward the optimal design scheme.In view of the above problems,the following works have been carried out.(1)The design scheme and stiffness calculation method of the novel bearing are put forward.Then,a stiffness correction method is put forward according to the compression and shear deformation of the novel bearing when it is compressed.(2)Mechanical property tests are performed on a specimen of the novel bearing with design frequency at 8 Hz and with 3500 kN bearing capacity.(3)Vibration reduction effect of the novel bearing are investigated through impulse vibration tests on scaled models of the novel bearing and common steel bearing.(4)The numerical simulation of the mechanical properties of the novel bearing specimen is carried out to verify and supplement the test results by the finite element software ABAQUS.(5)The numerical simulation of the vibration reduction effect of the novel bearing is carried out by establishing the model of the upper mass block-rubber bearing-pier system through the finite element software ABAQUS.(6)33 cases of novel bearing are designed to investigate the influence of inclination angle of rubber block,the total thickness of rubber layer and the thickness of rubber monolayer on the vibration reduction effect of the novel bearing,and get the best design plan in the end.Finally,based on the summaries and conclusions of all research works,some suggestions and prospects for further research are put forward.