Vibration Serviceability Research On Steel Tube Truss Composite Floor Of Crrc Culture Centre Of Science And Technology

As people’s living standards continue to improve,the demand for spiritual life is increasing.More and more people are willing to go to the exhibition hall,gymnasium,library and other public buildings.Public buildings tend to require large space and flexible layout.Compared with the traditional floor structure,the steel beam-pressed steel-concrete composite floor structure has more advantages,such as less pillars,less partition wall,larger span,convenient construction and beautiful appearance.But this kind of floor structure has light weight and small damping,the natural frequency of vibration often tend to be normal human activity frequency,the floor will produce larger vertical vibration under the action of normal human activities.If the floor ver-tical vibration exceeds a certain limit,the users will become annoyed and uncom-fortable,even panic,the consequence is very serious.If the completed buildings have the problem of vibration serviceability,it is difficult to repair,and the economic cost is high.So in the process of structural design,we must guarantee that the floor meet the requirements of strength and deformation,meanwhile,we should also attaches great importance to the problem of vibration serviceability,It is necessary to carry out the analysis about vibration serviceability due to human activity on the floor structure.Based on the engineering background of CRRC culture center of science and tech-nology,the analysis about vibration serviceability of the long-span steel tube truss composite floor was carried out in the process of structural design,and the influence factors of vibration serviceability for similar long-span steel tube truss composite floors were discussed.On the basis of the literature at home and abroad,this thesis briefly introduced the research status of the pedestrian load,vibration serviceability evaluation of the floor and vibration serviceability of composite floors,and the typical pedestrian load model and the vibration serviceability evaluation standard in the world were intro-duced in detail,the advantages and disadvantages between different vibration ser-viceability evaluating standards were compared,then this thesis put forward a suitable vibration serviceability evaluating standard and pedestrian load model.This thesis used the finite element analysis software SAP 2000 to carry out a simulation analysis for the long-span composite floor vertical vibration of CRRC culture center of science and technology.Modal analysis results showed that the first type vertical vibration frequency of the long-span floor was close to the frequency of human activity such as walking,running,jumping,and in the case of a rhythmic movement,the natural frequencies didn’t meet the requirements of vibration service-ability evaluating standard for this article.According to the requirements of the re-gional architectural function,this article determined the corresponding load excitation conditions,and analyzed the vibration response of the floor under various operating conditions,the corresponding peak accelerations were obtained.Then,combined with vibration serviceability evaluating standard for this thesis,the vibration serviceability of the floor was evaluated,results showed that the long-span steel tube truss compo-site floor of CRRC culture center of science and technology was possessed with a good integrity and stiffness,satisfied the requirement of the human body comfort.In this thesis,the influencing factors of vibration serviceability of a long-span steel tube truss composite floor were analyzed,the influence degree and rule of damping ratio,effective live load,concrete thickness,truss depth-span ratio and other factors on the floor vibration serviceability were obtained.The results of the research provided a reference for practical construction projects.