动力荷载对后加结构竖向振动的影响及加固分析

Influence of dynamic load on vertical vibration of post reinforcement structure and reinforcement analysis

近年来,动力设备不断进入民用建筑,比如排风设施的风机等。当两者之间的自振频率接近某一范围时将产生共振现象,引起人员的不适,甚至影响到结构的安全性。尤其是在房屋改建过程中的后加结构因与原结构连接整体性相对较弱,一旦两者产生共振现象将严重危害后加结构的安全。本文针对某办公楼悬挂在新加夹层楼板下方的厨房排风设施在运转时,处于新加夹层楼板上方人员感受到明显的振动,新加夹层楼板振动响应过大这一问题,在完成对结构进行现场振动测试的基础上,分析新加夹层楼板的动力特性,找到引起楼板振动原因,提出几种减振加固的方案,对比分析,找到最优的减振加固方案。结果表明:当后加楼板结构振动响应过大时,采用夹芯楼板加固方案可以有效地降低结构的振动响应,提高楼板的舒适度。

In recent years,power equipment has continuously entered civil buildings,such as fans for exhaust facilities.When the natural frequency between the two is close to a certain range,resonance will occur,causing discomfort to personnel,and even affecting the safety of the structure.Especially in the process of housing reconstruction,the integrity of the connection between the post-addition structure and the original structure is relatively weak.Once the resonance phenomenon occurs between the two,the safety of the postaddition structure will be seriously endangered.This paper aims at the problem that when the kitchen exhaust facility suspended under the newly added mezzanine floor is in operation in an office building,the personnel above the newly added mezzanine floor feel obvious vibration,and the vibration response of the newly added mezzanine floor is too large.On the basis of on-site vibration tests,analyze the dynamic characteristics of the newly added mezzanine floor,find out the cause of floor vibration,propose several vibration reduction and reinforcement schemes,compare and analyze,and find the optimal vibration reduction and reinforcement scheme.The results show that when the vibration response of the post-added floor structure is too large,the sandwich floor reinforcement scheme can effectively reduce the vibration response of the structure and improve the comfort of the floor.