基于金属橡胶垫和弹簧的变压器竖向隔震振动台试验研究

SHAKING TABLE TESTS OF VERTICAL ISOLATION FOR TRANSFORMER MODELS BASED ON METALLIC RUBBER CUSHION AND SPRINGS

基于金属橡胶垫和弹簧元件提出一种新型竖向隔震装置。对金属橡胶垫进行变幅值循环压缩试验,研究丝径、名义密度、预压荷载工况下的力学性能和稳定性;对采用新型竖向隔震装置的变压器缩尺模型进行竖向隔震振动台试验,研究隔震体系的动力特性以及单向和双向输入下各测点处的竖向加速度响应。研究表明:金属橡胶垫在预压荷载下的力学性能稳定;基于金属橡胶垫和弹簧的竖向隔震装置可以有效降低结构自振频率并减小地震能量输入,隔震效率随输入地震动幅值的增加而提高。

In order to study the influence of wire diameters and nominal densities on the mechanical properties of metallic rubber(MR) cushions in different parameters and preloading conditions, and to verify whether the mechanical properties of metallic rubber cushious stable in preloading conditions, a three-dimensional(3 D) isolation device was proposed based on metallic rubber cushions and springs. Then, vertical isolation shaking table tests were conducted on a scaled isolated transformer model, and the dynamic characteristics of the isolated structure, as well as the vertical acceleration response of the structure under unidirectional or bidirectional input were measured. The results showed that the mechanical properties of metallic rubber under preloading were stable, and the vertical isolation device based on metallic rubber cushions and springs could effectively reduce the natural frequencies of structures and effectively reduce the energy input, and the isolation efficiency increased with the increment of the peak ground acceleration.