Equivalent Wind Load Identification For Guyed Mast Considering Noise Impact And De-noising Method

High-rise structures like guyed mast are influenced by wind load obviously. Because of the high flexibility of the structure and the randomness of wind loads, the components of high-rise structures are prone to fatigue failure under the action of fluctuating wind. The collapse incidents of guyed mast can cause huge economic losses and social influence. A large number of mast accident report shows that the majority of the collapse incidents are caused by structural instability because of fatigue damage or component destruction because of exceeding the ultimate strength. Researchers usually inverse the structure loads can by the wind-induced response of the limited measuring point with load identification methods, then complete the assessment of wind-induced accumulative fatigue of structural members. But wind-Induced response is susceptible to noise pollution, it's necessary to analyze measurement noise on the results of the impact of load identification. The research on measurement noise effects for dynamic wind load identification is very necessary and meaningful.Based on previous research, nonlinear finite element model of the guyed mast is established in this paper. Isoparametric curved element and truss element are used to build the guyed cable and the mast model respectively. The simulation method of multidimensional cross-correlation fluctuating wind loads and the nonlinear static and dynamic response analysis method in time domain for guyed mast are studied.In this paper, the direct load identification based on simplified model and the method of dynamic load identification based on precise time integration are proposed to identify high-rise structural equivalent two-dimensional dynamic wind load. If wind-induced response affects by different intensity levels noise, analysis of the results of the identification showed that noise can affect the results of the load identification obviously.In this paper, the load on a mast instance is identified through numerical simulation, using optimal estimated method of dynamic load identification for multiple input-multiple output system based on inverse system analysis. The results show that the result of the dynamic load identification is better and meet the precision requirements when the wind-induced response by the different intensity of noise pollution. So, the methods have good ability to suppress noise.