高举架立式圆筒型储液容器柱顶隔震地震动响应研究

Seismic Response Study of Top Isolation Elevated Vertical Cylinder Storage Tanks

目的针对高举架储罐结构特点提出柱顶隔震措施,并构建柱顶隔震简化力学模型和有限元数值仿真模型.方法从数值分析及有限元建模进行隔震研究.结果柱顶隔震措施能有效控制高举架储罐的地震动响应,其减震效率与地震波频谱特性密切相关;随隔震周延长,上部储罐各工况减震率也变大,但支承结构各工况减震率逐渐减小;隔震层阻尼比变大时,各工况大致先减小后增大,有优化区间;理论解与有限元解相差不大,相互验证计算结果的正确性.结论建议柱顶隔震设计时应综合考虑场地类型、隔震周期和隔震层阻尼比对减震效率的影响,优化隔震设计.

According to the characteristics of the elevated storage tank structure,the top isolation measures are proposed,and the simplified mechanical model and finite element numerical simulation model of top isolation are established.In this paper,seismic isolation research from numerical analysis and finite element modeling,the result was indicative:the isolation measures can effectively reduce seismic response of elevated vertical cylinder storage tanks,and that the damping efficiency is closely related to the seismic spectral characteristics.With the increase of the isolation period,the vibration reduction rate of the upper storage tank is gradually increased,but the vibration reduction rate of the supporting structure is reduced gradually.With the increase of damping ratio,the vibration reduction rate first increases and then decreases and there is a reasonable range of damping ratio optimization.The theoretical solution and the finite element solution are close to each other,which verify the accuracy of the results.Top isolation design should consider the influence of site type,isolation period and damping ratio and optimize isolation design.