球形储罐罐底附加黏弹性阻尼器减震研究

Research on the vibration absorption of viscoelastic dampers on the bottom of a spherical tank

为了研究球形储罐罐底附加黏弹性阻尼器后的减震效果,推导了球形储罐考虑储液晃动效应的抗震简化力学模型、罐底附加黏弹性阻尼器的初始简化力学模型及二次简化力学模型,并进行了地震动响应分析,得出采用减震措施后能大幅削减球罐支承的受力,对储液晃动波高亦有一定控制作用;同时有限元数值仿真结果表明,在罐底附加黏弹性阻尼器后能有效减小球罐地震动响应;将有限元计算结果与数值解进行对比分析,数值解与有限元解十分接近,相互验证了计算结果的准确性。当采用简化力学模型进行减震设计时,初始简化模型及二次简化模型计算结果应适当放大,从结构安全性考虑放大系数可取1.1~1.2。

In order to study the damping effect of viscoelastic damper attached to the bottom of a spherical tank,the seismic simplified mechanical model considering the sloshing effect,the initial and further simplified mechanical model with viscoelastic dampers at the bottom of the tank are deduced respectively,and the corresponding seismic response analyses were carried out.The results show that the viscoelastic dampers can greatly reduce the force of the support of the spherical tank and the sloshing wave height of the reservoir.Moreover,the calculation results of the finite element model show that the additional viscoelastic dampers at the bottom of the tank can effectively reduce the seismic response.By comparison,the finite element calculation results and the numerical solutions are very close to each other,verifying the accuracy of the calculation results.When the simplified mechanical model is applied to seismic design,the results of the initial simplified model and the further simplified model should be properly amplified.For the purpose of structural safety,the amplification factor could be considered to be 1.1~1.2.