碟形弹簧竖向隔震结构振动台试验及数值模拟研究

提出了一种组合式碟形弹簧竖向隔震支座(DSB),性能试验结果表明,DSB具有较低的竖向刚度和20%左右的竖向等效阻尼比。采用不同地震波进行了1/2比例的基础固定模型及DSB竖向隔震模型振动台试验,试验结果表明,DSB的竖向隔震效果显著,随着输入地震加速度幅值的增加,DSB竖向基础隔震模型的隔震层发生较大的竖向变形,而上部结构的层间相对位移变化不大,输入加速度幅值为0.4g时DSB竖向隔震模型的加速度反应降低了50%以上,结构顶层的位移反应降低了40%以上,具有明显的竖向隔震效果。最后利用有限元分析软件,采用时程分析法对相同工况时模型结构的地震反应进行了数值分析,并与振动台试验结果进行了对比,两者吻合较好。

Shaking table test and numerical analysis of vertical-isolated building model with combined disk spring bearing

Combined disk spring bearing(DSB) for vertical isolated building is introduced in this paper.Vertical stiffness and damping performance of the DSB is studied through testing under static and dynamic loading.The experimental results show that DSB had good property of less vertical stiffness and the vertical damping ratio was about 20%.Shaking table tests of the 1/2 scale fixed-base model and the DSB vertical isolated model were compared to confirm the effect of the vertical isolation device.Results show that the DSB can isolate vertical earthquake energy remarkably.With the acceleration amplitude increased,the vertical displacement of the DSB model occurred on the vertical isolation layer,and the inter-story deformation of the superstructure changed slightly.The acceleration responses of DSB model decreased more than 50% and the displacement responses decreased more than 40% under seldom earthquake input,which confirmed that DSB could decrease the seismic responses obviously.Finally,the numerical analysis of earthquake response to the model structure is also performed by finite element analysis method.