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采用两组MTMD(多频调谐质量阻尼器)系统控制某大跨网格屋盖结构的竖向地震作用。提出了网格屋盖结构竖向MTMD的振动控制方程,并建立有限元分析模型,输入四种不同场地的地震波,进行动力时程分析,研究了频宽、阻尼比和质量比等参数对于MTMD系统减震效果的影响规律,表明频宽、阻尼比、质量比都存在最优值,最优频宽0.2―0.3,最优阻尼比0.01―0.02,考虑工程实际,质量比宜取0.005左右,这些最优值基本不受地震波频谱特性的的影响。
Two sets of MTMD (Multi-frequency Tuned Mass Dampers) systems are used to control the vertical seismic response of a large-span grid roof structure. The vibration control equation of vertical MTMD of grid roof structure is put forward and the finite element analysis model is established. The seismic waves of four different sites are input and the dynamic time history analysis is carried out. The effects of bandwidth, damping ratio and mass ratio on MTMD The results show that the bandwidth, damping ratio and mass ratio all have optimal values, the optimal bandwidth is 0.2-0.3 and the optimal damping ratio is 0.01-0.02. Considering the actual project, the mass ratio should be about 0.005, These optimal values are basically unaffected by the spectral characteristics of seismic waves.