TMD在基础隔震结构地震响应控制中的应用分析

Analysis on the Application of TMD in Seismic Response Control of Base Isolated Structures

文章对TMD在减小基础隔震结构地震响应方面进行了系统研究。首先,将基础隔震结构的上部结构简化为单自由度;然后以等效简化模型为基础,以隔震层相对基础的均方根值位移最小为原则,对TMD进行了数值优化设计;最后采用TMD的优化频率和阻尼,对该基础隔震结构进行了地震时程分析,评价了基础隔震结构的位移、加速度和层间剪力。研究结果表明:TMD能够减小基础隔震结构的地震响应,并且随着TMD质量的增加,减震效果提升,且均方根减震率普遍高于峰值减震率。研究成果可为用TMD减小隔震结构的地震响应提供理论上的参考。

In this paper,TMD is systematically studied in reducing the seismic response of base isolated structures.Firstly,the superstructure of base isolated structure is simplified as single degree of freedom.Then,based on the equivalent simplified model,the numerical optimization design of TMD is carried out based on the principle of minimum root mean square displacement of the isolated storey relative to the foundation.Finally,the seismic time history analysis of the base isolated structure is carried out by using the optimized frequency and damping of TMD,and the displacement,acceleration and inter-storey shear force of the base isolated structure are evaluated.The results show that TMD can reduce the seismic response of base isolated structure,and with the increase of TMD mass,the damping effect is improved,and the root mean square shock absorption rate is generally higher than the peak shock absorption rate.The research results can provide a theoretical reference for reducing the seismic response of isolated structures with TMD.