Vibration Serviceability Of Slab Of Large-Span Cantilevered Structures

With the continuous progress of science and technology and the improvement quality of people's life,the problem of slab vibration comfort under normal use will become more and more prominent.Reseach of slab vibration comfort is important.In the paper,the comfort of a large-span cantilevered structure subjected to human-induced vibration is studied,and the tuned mass damper(TMD)is studied,too.In this paper,the main evaluation criteria of vibration comfort at home and abroad are briefly summarized,and the related problems of pedestrian load model are discussed;The effect of controlling vibration of the design parameter of TMD are introduced;is analyzed by a finite element model is established for the large-span cantilever structure,and the vibration reduction effect of TMD system is analyzed,and the vibration reduction effect and dynamic response of different TMD parameters are discussed.The controlling vibration effect of TMD and its influence of the original structure are analyzed when the TMD parameters in design are used.The results show that the resonance of the large-span cantilever structure is easy to occur when the frequency of pedestrian load is the same or the half of the natural vibration frequency.When the TMD system is added,the effect in controlling vibration is obvious.With the increase of TMD mass,the controlling effect increases.When the TMD is dispersed,the effect in controlling vibration decreases slightly,but the amplitude of reduction is limited.The effect of the error between TMD frequency and the vertical vibration frequency is obvious.With the increase of the error,the rate decreases,and when the error is between-30% and 30%,it decreases rapidly in a straight line,and then the downward trend slows down.The span of the cantilever structure is big,and it is more flexible,easy to trigger resonance.The max acceleration exceeds the limit of the code.The acceleration response is better controlled by using TMD,which meets the requirements of the code.The increase of TMD will improve the serviceability of the structure,but at the same time,it will bring additional load to the structure,increase the deflection and stress of beams.