Study On Structural Wind Load And Wind Load Inversion

With the continuous development of social economy and technology,the rapid growth of urban population,making our high-rise buildings in the past three decades has been rapid development.Because the high-rise building has the characteristics of high height,small damping capacity and high flexibility,the natural frequency of the high-rise building is very close to the remarkable frequency of the natural wind,so the high-rise building is very sensitive to the wind load,and the wind load becomes the high-rise building design process Control one of the loads.In recent years,high-rise building wind-induced disasters have also occurred,so high-rise building wind response research by more and more attention.The research of this paper is carried out in this context.In this paper,a high-rise building along the southeast coast is taken as the object of study.Through the wind tunnel test and field measurement,the pulsating wind load of the high-rise building measuring point is obtained,and the wind tunnel test results are compared with the field test results.The main work is as follows:Firstly,the wind tunnel test and field measurement of a high-rise building along the southeast coast are introduced in detail.Through the wind tunnel rigid body model test,the wind pressure time course of each surface of the model surface under 24 working conditions is obtained.Through the field measurement,the acceleration time history signal of each measuring point under the influence of typhoon is obtained.Secondly,the general method of modal recognition of high-rise buildings under environment excitation is introduced.The derivation process of peak picking method,power spectrum principle and stochastic decrement method is given.The dynamic characteristics of the high-rise building are successfully identified by using the ac-celeration signal of the high-rise building.Then,the wind load inversion method of high-rise building is introduced in detail.Using the equivalent principle,the five-particle simplified bending-shear model of the high-rise building structure is established,which makes the dynamic characteristics of the simplified model similar to the original structure.The accelera-tion signal is denoised,and the frequency domain is integrated to obtain the velocity and displacement response of the measuring point.And then use the improved dy-namic equilibrium equation to invert the pulsating wind load duration on the structure.Inversion of the pulsating wind load superimposed on the average wind load,the total wind load time course is obtained.The total wind load is applied to the simplified model for time history analysis,and the obtained structural acceleration response agrees well with the measured acceleration response.Finally,the wind pressure time data obtained from the wind tunnel test are inte-grated to obtain the pulsating wind load of each measuring point.And the wind loads are compared with the inversion pulsating wind loads,and their similarities and dif-ferences between the rms wind load and the wind load power spectrum and the corre-lation coefficient are studied.The results show that the fluid-solid coupling The in-fluence can not be ignored.