Study On Longitudinal Ribs’ Influence To Wind-induced Vibration Of An Airport Control Tower

With the development of technology and the ever-increasing level of architectural design,high-rise and super-tall buildings have developed rapidly in recent years.Not only the height of the building is getting higher and higher,but also the body shape is becoming more and more peculiar.It is not satisfied with the use of traditional circular or rectangular cross-sections,and there have been many forms of facade decoration,such as the use of more surface longitudinal ribs.The description of the wind load for this type of cross-section building structure is not comprehensive in the specification,and needs to be determined through wind tunnel tests in engineering practice.This thesis analyzes the wind load and wind vibration response of the longitudinal section of the longitudinal rib with the wind tunnel test of the No.1 control tower of Tianfu Airport,and provides some references for similar structural wind load values and wind resistance design.First,wind tunnel testing of the control tower structure was conducted in the XNJD-3wind tunnel.The surface load test and the base high-frequency dynamic balance test were used to obtain the wind load characteristics,and the distribution characteristics of the wind pressure coefficient of the building surface were summarized.The average resistance coefficient of each section was compared with the coefficient of the surface pressure of the smooth circular section and the body shape coefficient specified in the code to determine the influence of the section of the section on the stress of the section.Secondly,wind responses of the Tianfu Airport No.1 control tower were calculated using the frequency domain method based on the wind tunnel test and the wind-induced vibration coefficient method based on the specifications.The results show that the calculation method of the normative regulations is more safe and conservative than the actual measurement.Finally,through the wind tunnel test of the command tower of Tianfu Airport No.1,the obvious vortex phenomenon was observed,and a series of aerodynamic parameters that affected the cross wind vibration were obtained and compared with the parameters of the smooth cylinder;meanwhile,according to the theoretical calculation of vortex-induced vibration,the cross-wind-induced wind-induced vibration response of the structure was obtained,the results show that the longitudinal ribs on the circular cross-section surface can improve the windinduced vibration performance of the structure.