人群节律性运动下大跨楼盖的随机振动问题研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (24) : 9-15.

论文

人群节律性运动下大跨楼盖的随机振动问题研究

李泉，樊健生，聂建国

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Stochastic Vibration of Long-span Floor under Crowd-induced Rhythmic Excitation

Li Quan, Fan Jiansheng, Nie Jianguo

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摘要

振动舒适度是影响大跨楼盖设计的关键问题，但现有的结构人激振动研究成果难以考虑楼盖的多模态共振和较为复杂的楼盖布置。本文针对人群节律性运动下楼盖的振动问题，采用虚拟激励法，推导了楼盖的随机振动模型，并采用该模型分析了楼盖人激共振机理，提出了激发楼盖共振的人群节律性运动频率确定方法和用于确定楼盖最不利共振荷载分布的模态位移和最大准则，最后对影响楼盖动力响应的接触持时比、阻尼比等关键参数进行了分析。

Abstract

This paper investigates the dynamic characteristics of long-span floors under crowd-induced rhythmic excitation by using stochastic vibration approach combined with finite element method for modal analysis. For this purpose, a stochastic vibration modal accounting for the multi-modal floor resonance is developed, together with the rules to quantify rhythmic excitation frequencies and loading regions corresponding to specified floor modal resonance. Also, the parameter study on contact ration and floor damping ratio was proposed.

导出引用

李泉;樊健生;聂建国. 人群节律性运动下大跨楼盖的随机振动问题研究[J]. 振动与冲击, 2012, 31(24): 9-15

Li Quan; Fan Jiansheng; Nie Jianguo. Stochastic Vibration of Long-span Floor under Crowd-induced Rhythmic Excitation[J]. Journal of Vibration and Shock, 2012, 31(24): 9-15