高举架立式圆筒型储液容器基础隔震有限元数值仿真分析

The finite element numerical simulation analysis of base isolation elevated vertical cylinder storage tanks

为了减轻强震对高举架立式圆筒型储液容器产生的破坏,采用基础隔震措施,对其地震动响应进行研究。基于ADINA有限元软件,罐壁、流体、支承及隔震层选取合适单元建立有限元模型。研究在不同阻尼比、不同隔震周期、不同地震动输入和不同储液高度等参数影响下高举架立式圆筒型储液容器的地震响应。结果表明:隔震周期越长减震率越大,但隔震层阻尼比对减震率影响不大;基础隔震高举架立式圆筒型储液容器的减震效应受地震波频谱特性影响较大;随着储液高度的增加,基础隔震减震率并无明显变化,均有较好的减震效果。基础隔震措施可优化支承结构设计,降低设防烈度,缩小截面尺寸,降低工程造价;基础隔震措施能有效控制支承的竖向反力,且不会产生上拔力,对支承倾覆无影响,可以优化基础设计。建议高举架立式圆筒型储液容器隔震设计时需综合多参数影响,选取最佳隔震设计方案。

In order to reduce the damage caused by strong motion earthquakes on the vertical cylindrical storage tank, the seismic response of the base isolation system was studied. Based on the ADINA finite element software, the tank wall, the fluid, the support and the base isolation layer are selected to establish the finite element model. Research seismic response of base isolation elevated vertical cylinder storage tanks with different parameters such as isolation layer damping ratio, isolation periods, different ground motion input and height of liquid storage. The results show that the isolation period longer damping rate is higher, but isolation layer damping ratio have few influence on the vibration reduction rate. The spectral characteristic of seismic have a big influence on the vibration reduction effect of base isolation elevated vertical cylinder storage tanks. The height of storage liquid have few influence on the vibration reduction rate, which is efficient. Base isolation measures to optimize the design of supporting structure, reduce seismic fortification intensity, reduce the size of the cross section, reduce the project cost; base isolation measures can be effectively controlled and supported the vertical reaction force and not have pulling force, to sup-port overturning effect and can optimize the design basis. Isolation earthquake design of elevated vertical cylinder storage tanks must consider a variety of parameters and select the best isolation design scheme.