【摘要】 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。更多还原

【Abstract】 Two groups of multiple tuned mass dampers(MTMD) are used in a long-span lattice roof structure to reduce the vertical seismic reaction.The dynamic equation of lattice roof structure with vertical MTMD is presented,and the finite element model is established to perform dynamic time-history analysis using four ensembles of strong ground motion records.The paper also studies the correlation of vibration-dissipation of roof structure and frequency width,damping ratio,and mass ratio.Numerical results indicate the existing of optimum values of these parameters.The optimum frequency width is 0.2―0.3,the optimum damping ratio is 0.01―0.02 and the optimum mass ratio is about 0.005 considering the engineering practice.The spectrum characteristics of earthquake waves have little effect on these optimum values.更多还原