Study On The Wind-induced Vibration Factor Of Suspend Dome Structure Under Non Gauss Wind

The suspendome structure is a self-balancing system composed of the upper single-layer reticulated shell and the lower tensioning rod system.The average wind cycle is much larger than the general structure of the self-vibration period,so it is generally considered as a static load.The fluctuating wind is caused by the irregular vortex in the atmosphere,and its cycle is often only a few seconds to several tens of seconds,so it is generally considered as a random load.In the 1960s,Davenport's research promoted the development of structural wind-resistant design,and he regarded fluctuating wind as a steady Gaussian stochastic process,and on this basis he raised the model of power spectral density of fluctuating wind.It is traditionally assumed that the fluctuating winds are a steady Gaussian stochastic process.However,in recent years,some studies have shown that in the negative pressure region,the fluctuating wind load time-history and the statistical properties of the Gaussian stochastic process are obviously different,especially the higher order moments,so these regions are called non-Gaussian regions.Wind load is a major consideration in the design of long-span structures.In the non-Gaussian characteristic area,the use of Gaussian wind pressure model for wind design will make the result is too small,which is not conducive to structural safety.In this paper,Gurley's correlation deformation method is used to simulate the non-Gaussian wind load duration,and the response of the suspendome under non-Gaussian wind pressure is obtained.The main contents of this paper are as follows:On the basis of lots of literature and engineering experience,the parameters of the suspendome structure are selected,the prestressing force of the prestressed cable in the lower part of the chord is determined,and the tension compensation method is used for morphological analysis.Based on the power spectral density function,skewness and kurtosis of the non-Gaussian pulsating wind field,the static transformation method is used to simulate the non-Gaussian wind field by using the linear transformation method.The conversion equation uses the Hermite model.The power spectrum of the simulated wind pressure time history is compared with the target power spectrum,and the two data curves match well.The time-history analysis is carried out on the finite element of the suspendome,and the response is obtained.The results of the two wind fields are compared.The peak factor of the suspendome under the Gaussian wind is calculated by using the crest factor method.The peak factor of the suspendome is calculated by Hermite series method.Aiming at the existing problems of wind-resistant design method applied to the wind-resistant design of suspendome structure,combined with the wind-induced vibration characteristics of suspendome structure,the whole wind-induced vibration factor is proposed to facilitate the engineering design.At last,the change rule of the response and the overall wind-induced vibration factor are obtained when the Span,prestress size,vector span,pole height and other parameters are changed.