ABSTRACT

The manufacturing of rubber bearing is complicated, the horizontal stiffness of the final product maybe greatly affected by the uncertainties during the processing, thus, it is necessary to study the distribution characteristics of the rubber bearings’ horizontal stiffness, and its influence on the seismic performance of the isolation structure. The rubber layer thickness was taken as a comprehensive index, measurements were carried out before and after vulcanization, the relationship between the rubber layer thickness and the variation of bearing’s horizontal stiffness was deduced, and an optimization method to reduce the variation of bearing stiffness was proposed. Then, based on the equivalent shear stiffness samples of 224 rubber bearings of 3 different specifications produced by two manufacturers, systematic statistical analysis and probability distribution tests were carried out. Result shown that the equivalent shear stiffness obeys the I-type minimum-value distribution. Finally, the influence of the variation of the bearing’s stiffness on the seismic performance of the rubber bearing isolation structure was studied. The results shown that the probability distribution form of the rubber bearings stiffness has a certain influence on the adjustment coefficient $\psi$ of the isolation structure, but the damping effect of the isolation structure still has sufficient safety reserve according to China’s Code for Seismic Design of Buildings.

摘要

橡胶支座的制造复杂，加工过程中的不确定性对最终产品的水平刚度影响很大，因此有必要研究橡胶支座水平刚度的分布特征及其对抗震性能的影响。的隔离结构。以胶层厚度为综合指标，在硫化前后进行测量，推导了胶层厚度与轴承水平刚度变化的关系，提出了降低轴承刚度变化的优化方法。 . 然后，基于两家厂家生产的3种不同规格的224个橡胶支座的等效剪切刚度样本，进行了系统的统计分析和概率分布检验。结果表明，等效抗剪刚度服从I型最小值分布。最后，研究了支座刚度变化对橡胶支座隔震结构抗震性能的影响。结果表明，橡胶支座刚度的概率分布形式对调整系数有一定的影响。$\psi$根据我国《建筑抗震设计规范》，隔震结构的阻尼作用仍有足够的安全储备。