Experimental Study On Vibration Isolation Of Rubber Sand Core Block On Vibration Table

In the southwest of China,there are many areas where the economy is less developed and the geographical position is out-of-the-way.The low-rise buildings are damaged seriously.When earthquake is approaching.With China's rapid economic development,a lot of waste tire are abandoned.Rubber elastic material and sand is rigid material.In order to improve the seismic capability of these buildings and save resources,the sand?rubber?hollow cement block are combined to become rubber-sand core block.Layer of isolation consist of a layer of rubber-sand block below the wall or the foundation.The upper loading can be delivered through the layer of rubber-sand core block,in which rubber-sand mixture absorb much energy and support upper load.It has not only protect environment and meet people's security need The mass fraction of the rubber-sand mixture is 30%.Vibration test-bed is invented and experimental model is scaled down and mass block is used instead of upper load.Research contents is below.1.The previous rubber-sand mixture research about static and dynamic is introduced firstly.On the basis of previous research and study,importance?principle?method?procedure?attention of the trial was introduced.2.The first way to place the rubber sand core block layer is between the foundation and the ground.The second is between foundation and wall.Acceleration of Vibration test-bed and mass block is measure and a-t curve of input and output is contrasted.Through the A-T acceleration curve,the vibration isolation coefficient of different Layer of isolation is compared.The conclusion is that the second is better than second way.3.To place the rubber sand core block layer between foundation and wall,the vibration isolation coefficient of different vertical load is compared in vertical load of 20kN?40kN?60kN in condition of fixed frequency and fixed amplitude.The conclusion is that in 20kN?60kN with the increase of vertical load of isolation layer,the effect of isolation decreases,and there is no isolation phenomenon at last.40kN is the better than others and at the same time the maximum input acceleration is 1m/s2 and the isolation coefficient is 10%-20%,which is the best vertical load.4.In condition that the vertical load of the upper vertical load is 40kN and to place the rubber sand core block layer between foundation and wall,the vibration isolation coefficient of different frequency is compared in the frequency of 1Hz?2Hz?3Hz.The conclusion is that when the vertical load is 40kN,the isolation performance of the isolation layer decreases with the increase of frequency.When the vibration frequency reaches 3Hz,there is no isolation phenomenon.5.The frequency has no isolation effect on large amplitude,and has the effect of vibration isolation to small amplitude.In the range of 1mm?5mm,the effect of isolation is decreasing with the increase of amplitude.The isolation layer has no isolation effect with the increase of frequency in amplitude of 5mm?8mm and 5mm is the limit value of isolation effect.6.The isolation performance of rubber sand mixture core block isolation layer is analyzed,summarized,analyzed and prospected.