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。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。
The dynamic characteristics of investigated by using stochastic vibration approach a long-span floor under crowd-induced rhythmic excitation were combined with finite element method for modal analysis. For this purpose, a stochastic vibration model considering the floor muhi-modal resonance was developed, the rules to determine rhythmic excitation frequencies and loading distribution corresponding to the specified floor modal resonance were presented. Also, the key parameters including contact time duration and floor damping ratio were analyzed.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第24期9-15,共7页
Journal of Vibration and Shock
基金
国家自然科学基金项目(51222810)
国家科技支撑计划课题(2011BAJ09B01)
关键词
楼盖
节律性荷载
振动
随机振动
共振
floor
rhythmic excitation
vibration
stochastic vibration
resonance
