三维隔震墩的隔震性能研究

The research of three-dimensional seismic isolation pier vibration isolation performance

通过三维隔震墩的拟静力试验研究其水平刚度,将试验结果与三维隔震墩的设计理论值进行比较。结果表明:试验结果与设计理论值相对误差在[7.4%24.4%]之间,验证了该隔震装置设计理论的合理性。利用ANSYS建立4层框架结构隔震与非隔震模型并进行时程分析,研究三维隔震墩的隔震性能。有限元对比分析结果表明:在考虑竖向地震动三维耦合作用情况下,框架梁截面竖向剪力增大,多层房屋的竖向地震动作用不可忽略;在输入不同地震动情况下,可以将水平加速度有效衰减40%以上,梁截面内力减小30%以上,该隔震装置的隔震性能良好。

This paper examines horizontal stiffness through the pseudo-static experiment of three-dimensional seismic isolation pier. Results indicate that relative error between test results and designed theoretical results varies from 7. 4% to 24. 4%,verifying reasonableness of the research design. The test uses ANSYS to build a three-tier framework for both isolation and non-isolation model,and conducts time-history analysis to study the isolation performance of three-dimensional seismic isolation pier. Results of the finite element analysis show that as the beam shear force increases and as vertical seismic 3 D coupling cases are taken into consideration,the effect of vertical seismic action of multi-stores buildings cannot be ignored. Also,tested in different input ground motion cases,the three-dimensional seismic isolation pier can effectively reduce horizontal acceleration to over 40%,and can reduce the beam inner force to over 30%,proving its excellent isolation performance.