Experimental study on the vertical compressive stiffness of rubber isolation bearings under different shear deformation

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (6) : 93-99.

JIN Jianmin1，XIAO Ji1，LIU Yanhui1，FENG Demin2，TAN Ping1，HUANG Xiangyun1

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Abstract

For rubber isolation bearings in isolated structures, the theoretical calculation methods for its vertical compression stiffness under different horizontal shear deformation were studied, and based on a two-spring model, an improved theoretical calculation formula for the stiffness was presented.Compressive property tests under different compressive stress and different shear deformation for linear natural rubber bearings and lead rubber bearings of S2=5 series (G4) commonly used in building structures were carried out and the vertical compression stiffness of rubber isolation bearings under different horizontal shear deformation was investigated by experiments.The results show that the vertical compressive stiffness of the bearing decreases with the increase of shear strain and increases with the increase of design compressive stress.Under the condition of the same design compressive stress, it decreases with the increase of the changing range of compressive stress.Although the calculation based on the effective bearing area of the bearing can reflect the trend that the vertical compression stiffness of the bearing decreases with the increase of shear strain, there is a big error between the calculation and test results.The calculation method based on the two-spring model has better calculation accuracy compared with that based on the effective bearing area of the bearing, however, there is also a big error when the shear strain is not less than 150%.The improved calculation formula for the vertical compression stiffness of rubber isolation bearings under different horizontal shear deformation presented in the paper can get the results in good agreement with the experimental results and has better calculation accuracy compared with conventional calculation methods based on the double-spring model and based on the effective bearing area of the bearing.

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linear natural rubber bearing / lead rubber bearing / vertical compressive stiffness / experimental study

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JIN Jianmin1，XIAO Ji1，LIU Yanhui1，FENG Demin2，TAN Ping1，HUANG Xiangyun1. Experimental study on the vertical compressive stiffness of rubber isolation bearings under different shear deformation[J]. Journal of Vibration and Shock, 2021, 40(6): 93-99

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