Seismic Response Analysis Of Sand-Rubber Isolation Cushion

Our country is a seismically active area, east nearing the ring the Pacific seismic belt, the Eurasian seismic belt is closing the southwest region of our country.5.12Wenchuan earthquakes in2008and4.14Yushu earthquakes in2010had brought people a great loss. Especially in the low income of rural areas of our country, the houses damaged especially serious. Combination of villages and towns construction situation of earthquake, we need develop a new building isolation technology to reduce the harm of earthquake. This isolation technology will be of great significance to the development of society.Sand and rubber cushion isolation need laid a certain thickness, compactness of sand mixture with rubber cushion layer between the building foundation and foundation. Quartz sand consumed the earthquake energy by fritting between sand by sand. When the rubber particles had been squeezed, it could convert external power into elastic potential energy. When earthquakes occurs, the rubber particles has been compressed, the isolation cushion layer achieved the damping effect and protected the buildings safe.We used the shaking table to simulate the test of sand and rubber vibration isolation cushion under different diameter of sand(2mm,4mm,6mm), rubber particle content(0%,20%,40%,60%) and thickness of the cushion(6cm,12cm,18cm),and then filtered each set of test data, extracted the maximum acceleration value as a comparative object.Finally get structural acceleration response data.Through analysis we can conclude that:As sand and rubber vibration isolation cushion layer thickness increase, the structure response of the acceleration of every layer showed a trend of decrease in the seismic; With the increase of rubber content in the composite material, the structure response acceleration of each layer showed a trend of decrease in the seismic,When the rubber particle content increased to40%-60%, the structure of the damping effect raised gently; With the increase of particle size of the quartz sand, the structure response of the acceleration of every layer showed a trend of decrease in seismic response. It showed that the vibration isolation effect of large size of quartz sand of the composite isolation cushion layer is good, damping effect is more obvious. From the experimental data show that sand and rubber vibration isolation cushion layer can reduce the energy of earthquake effectively, so as to achieve the effect to protect the safety of buildings when the earthquake strikes.Through the study the isolation effect of sand and rubber vibration isolation cushion, we can provide reference basis of the sand and rubber isolation technology in the practical engineering application in the future.