Study On Composite Estimation Of Wind Load And Response Of Super Tall Building

The primary problem in the design of a super-tall building is to determine the wind load and wind response of the structure reasonably.The numerical simulation is generally based on a turbulent model with an empirical component,so the results are not completely reliable.Wind tunnel test is the main research method at present.However,because it can not satisfy all the similarity criteria and boundary effects,it will lead to a gap between the results and the true value.Field measurement is the most direct and reliable way,and high precision structural acceleration and displacement response can be measured at present.But limited to the precision of the instrument,the technical methods and the complex flow field,the reliable data of the measured wind load can not be obtained directly.In this paper,a new algorithm is proposed to obtain three responses from the wind load simultaneously.,it improves the computational efficiency compared to the traditional structural dynamics method,and applied to Ji'nan ZhongHong Plaza wind tunnel test data processing.Then put forward improved continuous time domain Kalman filter(CKF)and the discrete Kalman filter(DKF)reverse wind load estimation method,and through the Ji'nan ZhongHong Plaza wind tunnel test data as the input response obtained good results of wind load and response.For the two kind of reverse estimation method of wind load and wind-induced responses,the wind load and the unknown wind response of the research object structure can be accurately estimated by obtaining one of the 6 layers of response based on the optimized point layout scheme.,whether the whole or any basal layer results is accurate enough.The error of structural modal parameters has little effect on the accuracy of the wind load reverse estimation method,and it can still maintain its high accuracy within a certain range.Study on the different wind angle along wind and across wind,then come to conclusion that two kind of reverse estimation of wind method can get the accurate results and across wind is more accurate.The influence of initial value on two kinds of backward estimation algorithms is discussed.The research shows that the initial value has a certain effect on the limited time range.It will soon converge to the exact value as time goes on,and has little effect on the whole.At the same time,it is explained theoretically that all two kinds of algorithms have good stability.The optimal noise covariance is obtained by the L-curve theory,and then the corresponding Kalman filter gain is obtained.The test shows that all the two kinds of algorithms have some noise resistance,and the anti noise performance of the input acceleration response is better,and the anti noise energy of CKF is slightly stronger than that of DKF.It can also meet the demand of engineering precision under the influence of certain noise.This paper uses wind tunnel test data to verify the accuracy and reliability of the proposed two kinds of inverse estimation methods.A new research means is provided to reveal the mechanism of wind load action and the characteristics of wind vibration response.The research results can be further applied to the estimation of wind load in the field measured response of a super-tall building.