摆式电涡流TMD-钢框架结构的耦合计算方法与减震分析

摆式电涡流TMD作为一种新型阻尼器，多用于人致振动和风振控制，较少应用抗震工程，也缺乏较好的计算方法。为研究摆式电涡流TMD的减震性能及合理的质量比μ_m，根据摆式电涡流TMD的力学特性，提出一种基于联合仿真的耦合计算方法，根据现行建筑抗震设计规范，分别建立了5、10、20层钢框架结构模型，设计了5组不同μ_m的摆式电涡流TMD，并采用提出的耦合计算方法，对摆式电涡流TMD钢框架结构模型进行了动力时程分析，得到了罕遇地震作用下结构的层位移、层间位移角、层剪力和层加速度与μ_m的关系曲线，并与无TMD结构的地震响应进行了对比。研究结果表明：提出的耦合计算方法可行且有效，摆式电涡流TMD可有效降低钢框架结构的地震响应，当μ_m为3%时较为合理。其中，20层钢框架结构的层位移、层间位移角、层剪力和层加速度分别减小26.5%、20.9%、4.3%、7.3%。

Coupling calculation method and seismic analysis of pendulum eddy current TMD-steel frame structures

Pendulum eddy current TMD as a new type of damper is often used in the control of human-induced vibration and wind-induced vibration, but seldom used in seismic engineering. And there is still a lack of effective calculation methods. In this paper, a coupling calculation method based on joint simulation is proposed to investigate the damping performance and reasonable value of mass ratio. A numerical model is established for 5-story, 10-story and 20-story steel frame structures along with five groups of pendulum eddy current TMDs with different mass ratios, which conform to the current Seismic design code for buildings and mechanical properties of pendulum eddy current TMD. A dynamic time-history analysis is performed on the numerical model by using coupling calculation method. The analysis yields a series of curves of story drift, interstory drift ratio, story shear force, and story acceleration versus mass ratio under rare earthquakes. The analysis results are compared to the results of the control model that has no pendulum eddy current TMD. The comparison shows the feasibility of the proposed coupling calculation method and that pendulum eddy current TMD can effectively reduce the seismic response of the steel frame, with a 26.5% reduction for story drift, 20.9% for interstory drift ratio, 4.3% for story shear force, and 7.3% for story acceleration of a 20-story steel frame structure when the reasonable mass ratio is recommended to be 3%.