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| Experimental Research on the Vertical Pressure Dependence about Shear Properties of High Damping Rubber Bearing |
| WANG Jian - qiang1，ZHANG Zhen - yang2，LI Zheng3 |
| (1. Zhengzhou University，Zhengzhou，Henan 450001， China;2. The Architectural Design and Research Institute of Henan Province Co. Ltd， Zhengzhou，Henan 450014, China; 3. Henan Vocational College of Applied Technology， Zhengzhou，Henan 450042,China) |
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Abstract Abstract: Research purposes: In the actual earthquake due to the impact of horizontal overturning moment and vertical ground motion，the vertical pressure on the rubber bearing in the base - isolated structure will change greatly，and the shear properties of tlie bearing will change due to the changing of the vrtical pressure of the rubber bearing. So it is necessary to study the pressure dependence about the shear properties of the bearing. In this paper，the cyclic loading method was adopted to study the shear properties of the high damping rubber bearing，the influence of the vertical pressure and shear strain on theshear properties of HDR was studied. So the empmcal formula on the presure dependence of the bearing shear properties will be established. Research conclusions:(1) Witli the increase of compressive stress，the hysteresic loops of HDR become more full，the energy dissipation of HDRincreases，and the stiffness harding phenomenon obviously appears. (2) The yield force and the equivalent damping ratio of HDR increase witli the increase of compressive stress. As the shear strain increasing，the 9fect of compressive stress on the yield force increases, the 9fect of compressive stress on the equivalent damping ratio decreases. (3) The post yield stiffness of HDR decreases with theincrease of compressive stress，the effect of compressive stress on the post yield stiffness decreases with the increase of shear strain. (4) When the shear strain is larger，the horizontal equivalent stiffness of HDR increases with the increase of compressive stress. (5) According to the test results，the empircal formula on the pressure dependency of the bearng shear properties is given， which can be used by deigners of tiie bae - isolation stricture.
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Received: 02 March 2016
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2017, Vol. 34 
