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 post-addition 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.
关键词
后加结构/楼板共振/自振频率/动力荷载激励/加固改造/夹芯楼板
Key words
post-added structure/floor resonance/natural frequency/dynamic load excitation/reinforcement and reconstruction/sandwich floor
维普
万方数据