青岛理工大学学报

为提高新兴装配式建筑的隔震性能，提出一种负刚度磁流变弹性体三维隔震支座。该支座基于磁流变弹性体刚度可随磁场变化而发生改变的性能，通过磁场强度调整支座整体刚度，同时加入碟簧组共同组成三维隔震支座。对新型隔震支座进行理论设计，确定支座各构件尺寸及磁路分布。利用有限元软件对所设计磁路进行验证，建立新型隔震支座模型，对其水平和竖直方向力学行为进行数值模拟。结果表明，负刚度磁流变弹性体隔震支座磁路设计合理，荷载作用下具有良好的滞回性能。随着磁感应强度的增加，支座水平刚度最大可增加40.8%,等效阻尼比可增加19.7%,相较于传统力学性能单一的隔震支座具有更好的隔震效果，从而在面对不同强度地震时具有更好的适应性。

To improve the seismic isolation performance of new prefabricated buildings, a negative stiffness magnetorheological elastomer three-dimensional seismic isolation bearing is proposed. Based on the properties that the stiffness of magnetorheological elastomer can change with the changes of magnetic field, the overall stiffness of the bearing is adjusted by the strength of the magnetic field. Meanwhile, disc spring group is added to form the three-dimensional seismic isolation bearing. Theoretical design of the new type of seismic isolation bearing is carried out to determine the size of the bearing components and the distribution of the magnetic circuit. The designed magnetic circuit is verified by finite element software, and the new seismic isolation bearing model is established to numerically stimulate its horizontal and vertical mechanical behaviors. The results show that the magnetic circuit of the negative stiffness magnetorheological elastomer seismic isolation bearing is designed reasonably and has good hysteretic properties under load. With the increase of magnetic induction intensity, the horizontal stiffness of the bearing can be increased at most by 40.8%, and the equivalent damping ratio can be increased by 19.7%. Compared with the traditional seismic isolation bearings with single mechanical performance, the proposed bearing has a better isolation effect, and therefore has a better adaptability to earthquakes of different intensities.