IDENTIFICATION OF THE MAIN CONTRIBUTION MODES OF WIND LOAD OF SUPER-TALL BUILDINGS BASED ON POUBLE MIDAL TRANSFORMATION

The rigid model synchronization pressure test of one super-tall building is carried out in TJ-2 Wind Tunnel and the time-history of wind pressure is gained. Then the Double Modal Transformation Method (DMT), including Classical Modal Analysis and the Proper Orthogonal Decomposition, is used for calculating wind-induced responses. The results show that: the results of wind-induced responses are related to the load-mode influence coefficient. With high orthogonality between one load mode and an inherent mode, the contribution of one load mode is small, and the contrary case is the same. At the same time, the results of wind-induced responses are related to the energy of main coordinates of load modes (proper value), spectrum properties, structural frequency and damping, and the contribution of proper value on wind-induced responses will be greater as its value is greater. When the damping is a fixed value, the contribution on the resonance component of wind-induced responses will be greater with spectrum of one frequency greater.