Research on the Vertical Mechanical Properties of a Nylon Fabric Laminated Rubber Bearing
In order to improve the seismic isolation level of buildings in villages and towns,a kind of nylon fabric laminated rubber bearing with low cost,low stiffness and high damping ratio was designed and made.The material mechanical properties were tested,and the vertical cyclic compression test was carried out.The test results show that the elongation at tensile break of rubber is about 600％.That adding nylon fabric to rubber can greatly increase the initial tensile stiffness of rubber;The vertical stiffness of nylon fabric laminated rubber bearing is obviously smaller than that of laminated steel plate rubber bearing,positively correlated with the compressive stress.The equivalent damping ratio of above 6％is negatively correlated with the compressive stress,which has strong energy dissipation capacity;At the same time,the vertical stiffness is negatively correlated with the number of nylon fabric layers and the total thickness of rubber layer,but both of them have little effect on the equivalent damping ratio.The bearing with nylon fabric 1680D has better mechanical properties.Finally,a correction factor is introduced into the stiffness calculation formula of the traditional laminated steel rubber bearing.And the accuracy of the predicted value is verified by the test results.
nylon fabricrubber bearinghysteresis curvecompression testvertical stiffnessequivalent damping ratio
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