基于TMD的大跨度组合楼板足球场减振设计

Vibration damping design of a large-span composite floor soccer field based on TMD

某学校体育馆顶层布置有大跨度钢混凝土组合楼板,拟作为足球场使用。当人群在楼面上行走或跑步时,易引起楼面的共振。为了在不改变主体结构尺寸的前提下,解决大跨度组合楼板的舒适度问题,本文通过采用调谐质量阻尼器(TMD)减振技术,运用Midas Gen有限元软件对结构进行减振前后的动力特性分析。结果表明:TMD减振技术可以显著抑制楼板在人行荷载激励下的振动,模态变形最大处的竖向加速度均小于规范限值0.15 m/s~2,各荷载工况减振率均在30%以上。采用该减振技术,在不显著增加工程造价的前提下,满足了结构舒适度要求。

A large-span steel-concrete composite floor is arranged on the top floor of a school gymnasium,which is intended to be used as a soccer field.When the crowd walks or runs on the floor,it is easy to cause the resonance of the floor.In order to solve the comfort level problem of large-span combined floor without changing the dimensions of the main structure,the tuned harmonic mass dampers(TMD)damping technique is used to analyze the dynamic characteristics of the structure before and after damping by using Midas Gen finite element software.The results show that the TMD damping technique can significantly suppress the vibration of the floor under the excitation of pedestrian load,and the vertical acceleration at the maximum modal deformation is less than the code limit value of 0.15 m/s~2,and the damping rate of each load condition is more than 30%.The vibration reduction technology is adopted to meet the structural comfort level requirements without significantly increasing the project cost.