随机人流荷载作用下各层弱相关钢吊杆悬挂结构人致振动研究

Study on Human-induced Vibration of Weakly Correlated Steel Suspender Structure Under Random Flow Load

以某各层弱相关的钢吊杆悬挂结构建筑为研究对象,建立基于舒适度评价的精细化有限元模型,同时采用考虑人群行走路径的随机人流荷载,对结构进行人致振动响应计算。结果表明:该结构在人致荷载激励下,振动舒适度超标,应采取相应的减隔振措施;人致荷载的高阶主谐分量会引起结构共振,在结构设计时要注意使基频避开步行荷载的倍频频率。改变建筑功能布局会影响人流行走路径,从而使人流行走路径避开楼板模态振型峰值处,降低人致振动响应,最高可以使振动响应降低21.6%,在设计中可通过改变建筑功能布局的方法,来达到减振的目的。

A steel suspender structure with weakly correlated layers was taken as the research object,and a refined finite element model based on comfort evaluation was established.At the same time,the random flow load considering the crowd walking path was adopted to calculate the human-induced vibration response of the structure.The results show that the vibration comfort of the structure exceeds the standard under human-induced load excitation,and corresponding vibration reduction and isolation measures should be taken.The high order principal harmonic component of human-induced load will cause structural resonance.Attention should be paid to make the fundamental frequency avoid the double frequency of walking load in structural design.Changing the functional layout of the building will affect the walking path of people,so that the walking path of people will avoid the peak of the floor modal shape and reduce the human-induced vibration response.The maximum vibration response can be reduced by 21.6%.The purpose of vibration reduction can be achieved by changing the functional layout of the building in the design.