The Application Of TMD On Human Induced Vibration On Long-span Floor

In recent years,it is because of the development of the theory of spatial structure and high-strength materials in the field of construction engineering,large-scale public building structures(such as large stadiums,hotels,stations,etc.)are developing towards lightweight,large-span,low damping,and floor layout with fewer partitions and large span is becoming more and more popular with the public.As a result,the natural frequency of slabs tends to decrease,which may be close to or even fall into the frequency band of pedestrian load.According to the different functions,the long-span floor slab is likely to suffer from the phenomenon of resonance caused by the regular movement of many people,which leads to the decrease of the applicability of the structure.Taking the large-span floor slab of a conference hall of an exhibition center as the engineering background,this paper analyzes and studies the possible vibration of human-induced structure controlled by TMD,and puts forward the corresponding vibration control measures.This paper mainly focuses on the following aspects:Firstly,we review the relevant theories and research methods of human-induced structural vibration as well as the comfort standard of structural vibration,and briefly introduce the vibration control principle of TMD from three aspects: mass dynamic vibration absorption,damping dynamic vibration absorption and damping effect of main structure.Finite element modeling analysis of the large-span floor structure shows that the first-order vertical frequency of the structure is less than 3Hz,which does not meet the requirements of the code.Secondly,using the principle of TMD resonance and MATLAB program,we establish the resonance model relation matrix,and analyze the influence of TMD parameters on its vibration reduction effect.Thirdly,in combination with the large-span floor structure,we use finite element software to establish the structure-TMD calculation model,use different pedestrian excitation load curve,use time-history analysis method to analyze the TMD control structure vibration,and compare the calculation results with the test results after the installation of TMD.Based on the theoretical calculation and analysis of finite element modeling and the field measurement results after the installation of TMD,we can know that TMD can effectively control the human-induced vibration of long-span floor.