高阻尼橡胶支座剪切性能压力相关性试验研究

发布时间：2018-07-15 10:31

【摘要】：研究目的:在实际地震中由于水平倾覆力矩和竖向地震作用的影响,基础隔震结构中橡胶支座承受的竖向压力将会产生较大变化,而橡胶支座竖向压力的变化将会对支座的剪切性能产生一定影响,因而有必要对支座剪切性能的压力相关性进行研究。本文采用低周反复循环加载试验方法对高阻尼橡胶支座进行压剪试验,研究压应力和剪应变对支座剪切性能的影响,从而建立高阻尼橡胶支座剪切性能的压力相关性经验公式。研究结论:(1)随着压应力和剪应变的增大,支座的滞回曲线越来越饱满,支座的耗能能力增大,并出现了明显的刚度硬化现象;(2)支座的屈服力和等效阻尼比随着压应力的增大而增大,随着剪应变的增大,压应力对屈服力的影响逐渐增大,压应力对等效阻尼比的影响有所减小;(3)支座的屈服后刚度随着压应力的增大而减小,随着剪应变的增大,压应力对屈服后刚度的影响逐渐减小;(4)当剪应变较大时,水平等效刚度随着压应力的增大而增大;(5)根据试验结果给出了支座剪切性能的压力相关性经验公式,可供高阻尼橡胶支座基础隔震结构设计人员参考和使用。
[Abstract]:Research purpose: due to the influence of horizontal overturning moment and vertical earthquake action, the vertical pressure of rubber bearing in the base isolation structure will change greatly in the actual earthquake. The change of vertical pressure of rubber bearing will have a certain influence on the shear performance of the bearing, so it is necessary to study the pressure dependence of the bearing shear performance. In this paper, the compression shear test of high damping rubber bearing is carried out by using low cycle cyclic loading test method. The influence of compressive stress and shear strain on the shear performance of high damping rubber bearing is studied, and the empirical formula of pressure dependence on shear performance of high damping rubber bearing is established. The conclusions are as follows: (1) with the increase of compressive stress and shear strain, the hysteretic curve of the bearing becomes more and more full, and the energy dissipation capacity of the support increases. (2) the yield force and the equivalent damping ratio of the bearing increase with the increase of the compressive stress, and the influence of the compressive stress on the yield force increases with the increase of the shear strain. The effect of compressive stress on the equivalent damping ratio is reduced, (3) the stiffness of bearing decreases with the increase of compressive stress, and with the increase of shear strain, the influence of compressive stress on the stiffness after yield decreases gradually. (4) when the shear strain is large, The horizontal equivalent stiffness increases with the increase of the compressive stress. (5) based on the experimental results, the empirical formula of pressure dependence on the shear behavior of the bearing is given, which can be used as reference for the designers of the isolation structure of the base of the rubber bearing with high damping.
【作者单位】：郑州大学;河南省建筑设计研究院有限公司;河南应用技术职业学院;
【基金】：国家自然科学基金项目(U1204502) 河南省重点科技攻关项目(152102210238)
【分类号】：U442.55;TU352.12

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