Time-history Analysis For Tall Buildings Under The Action Of Wind Loading

In recent years,with the rapid development of structure design and construction technology,lots of tall buildings were advancing towards the direction of high,big and soft,which were more sensitive to wind loading.Meanwhile wind loading had gradually become the main load of the structure on the horizontal direction,and even played a control role.So the research on wind loading was widely carried out in scientific researchers.In this paper,the numerical simulation method was used to simulate the wind load time-history of a high-rise structure,then along-wind dynamic time-history analysis was carried on the structure.The main contents were as follows:(1)Numerical simulation of tall buildings wind load time-history.Based on Davenport wind speed spectrum,the theory of random process,the linear filtering method and AR model was used to simulate along-wind time-history of a tall building,and verified the rationality and accuracy of the simulation results,which laid a foundation for along-wind dynamic time-history analysis.(2)Modal analysis of tall buildings.A finite element model of the tall building was set up in ETABS program,a finite element software of CSI company,then modal analysis was carried on,which was in order to get vibration mode of the model and the basic dynamic characteristics such as natural cycle.(3)Linear time-history analysis of tall buildings under along-wind time-history.Importing wind load time-history into finite element model,in order to get the information about that such as acceleration,displacement,and force response,also could analyze the characteristics of the dynamic response of the tall building under wind load.(4)Based on the specification of the equivalent static wind load analysis.The specification method was adopted to calculate the equivalent static wind load,then the static analysis of the model was carried on and comparing the results of the two kinds of calculation methods,in order to analyze the causes of the differences,and get some beneficial conclusions.Secondly,the comfort of the structure under wind load were also compared to a similar level,which could provide some reference for preliminary design of structural wind resistance.