摘要
当实际结构受到的荷载(如地震、人行荷载)激励时间较短结构振动处在过渡过程中时,MTMD抑制结构振动的效果与结构受到荷载激励的时间有较大关系。通过对TMD、MTMD抑制结构共振的机理进行分析,对MTMD抑制结构的振动效果与荷载激励时间的关系进行了探讨。结果表明:当荷载激励时间足够长,且结构振动时程表现为共振状态时,抑制振动的效果最佳;而当荷载激励时间较短,且结构振动经过较少周期就达到最大振幅时,减振效果较差。
When a short-term load,such as an earthquake or a foot-walk load,is applied to the actual structure,and owing to the excitation period being relatively short,the structural vibration is still at the transitional stage,the steady-state vibration can not be attained,in which case the effects of the MTMD on suppressing the structural vibration are,to a certain extent,related to the length of the time of the load excitation.Through the analysis of the mechanism of the TMD and the MTMD suppressing the structural sympathetic vibration,the relationship between the effects of the MTMD suppressing the structural vibration and the length of the time of load excitation is explored in the paper.The results show that when the duration of the load excitation is long enough and the structure is in the state of resonant vibration,the effect of the MTMD suppressing the vibration is the best.However,when the duration of the load excitation is short and the maximum amplitude of vibration is reached within short cycles,the effect of the multiple-tuned mass dampers on suppressing the structural unstable-state vibration is poor.
出处
《国防交通工程与技术》
2011年第3期34-37,共4页
Traffic Engineering and Technology for National Defence
