结构广义调谐体系及其减震控制的参数影响分析

Researches of General Tuned Systems in Broad Sense and Parameter Influences on Response Reduction Control

针对工程结构调谐减振体系的地震反应控制,提出广义调谐体系的概念,从地面输入的复频域分量入手,对广义调谐体系的影响参数进行了理论分析。文中将广义调谐体系模型化为上下两质点模型,采用复频域地面激励输入,得出了稳态响应解析式,得出了调谐体系地震反应的4个主要影响参数,进一步分析得出了窄带激励下调谐子结构周期的优化配置。在此基础上,计算分析了其它参数对调谐体系位移反应和底部剪力幅值的影响,包括调谐子结构与主结构质量比ρ、主结构与激励的周期比βsE、结构阻尼等参数的影响。最后评析了多高层结构在地震作用下调谐减震控制的有关问题,指出了提高质量比ρ的重要性及方法,对拓展调谐减振体系的减震研究应用具有指导意义。

The control efficiency of tuned vibration reduction systems in reducing earthquake excited vibration is an important subject. So influence parameters are investigated in this paper, in which the concept of a general tuned system is put forward and constant narrowband excitation is considered. During the exploration, general tuned systems are modeled by representative tuned systems of 2 D0F excited by complex frequency field and analytic expressions of stable response are concluded. Four main parameters influencing seismic response are deduced. Furthermore, optimal configuration of tuned substructure under narrowband excitation are studied. On bases of these, influence of other parameters on drift or base shear amplitude is analyzed, including mass ratio p, period ratio of main structure to excitation /~,E and damping ratio. Finally key problems of tuned systems in seismic response control are commented on, together with the importance and method of increasing mass ratio, which will show some significance in future researches on seismic response control of tuned systems.