Research On Vibration Serviceability Of Large-span Floor System Of Basketball Hall

The structural design of the building usually focuses on the safety of the structure,and the applicability to the structure is only controlled from the aspects of deflection and crack.With the continuous innovation of building structure design and construction technology,the extensive use of new materials,the modern engineering structure has become lighter,softer and larger,which directly leads to a significant decrease in the natural vibration frequency of the structure.When structure’s natural vibration frequency is close to the frequency of people’s daily activities,it is easy to cause the floor to tremble.This is the vibration serviceability issue.Gymnasiums generally belong to large-span public buildings.The crowds on the floor are dense and the forms of movement are varied.The vibration serviceability issue is particularly acute.This paper takes the large-span floor of a college basketball stadium as the research object,and on the basis of summarizing and analyzing the research results of a large number of large-span structural vibration serviceability at home and abroad,discusses the evaluation criteria of basketball hall vibration serviceability.The finite element software Midas gen and Ansys were used to simulate the vibration response of the large-span floor structure of the basketball hall under various sports conditions,and the vibration serviceability evaluation was carried out.The main research contents and results are as follows:1.Comparative analysis of a large number of domestic and international large-span structural vibration serviceability research results,proposed a vibration serviceability evaluation criteria for basketball halls.According to the actual use of the basketball hall,three human-induced load models for walking,jumping and running were established.2.Taking a basketball hall of a college in Weinan City,Shaanxi Province as an engineering example,it simulates various sports conditions that appear in the basketball hall,such as basketball training,basketball games,group gymnastics,and daily activities.The finite element software Midas gen was used to analyze the vibration response of the floor structure under various working conditions,and compared with the vibration serviceability standard.This vibration serviceability analysis method can be used as a reference for practical engineering design.3.The effects of different factors on the vibration response of the slab were simulated by Midas gen and Ansys software.The beam height,beam width,plate thickness,beam spacing,profiled steel plate and damping ratio were used as the parameters to compare and analyze under the single factor control.In order to obtain effective measures to improve the vibration serviceability of the floor.The analysis results show that the increase of beam height and beam width can significantly improve the structural vibration within a certain range;the greater the structural damping ratio,the better the vibration serviceability performance;the vibration serviceability performance of the profiled steel-concrete composite floor is better than that of the reinforced concrete floor.Increasing the thickness of the plate and reducing the beam spacing are not obvious improvements in vibration serviceability.