In May 2021, the SEG Plaza in Shenzhen of China experienced abnormal vibrations, which aroused widespread social concern. The reason of the vibrations is summarised as follow: the wind load causes the vortex-induced vibration of the masts located at the top of the building, which in turn results the resonance vibration between the masts and the building. To reproduce the abnormal vibration, the field measurements were carried out to obtain the modal information of the building and the masts firstly. Wind-tunnel substructure hybrid simulation (WTSHS) was proposed to reproduce the abnormal vibration of SEG Plaza. In WTSHS, the outer skin of the cantilever section of the masts is taken as the experimental substructure and modelled by rigidity compression wind-tunnel test. A multi-degree-of-freedom (MDOF) model of the building incorporating the dynamic characteristics (MDOF model) of the cantilever section of the masts is considered as the numerical substructure. The bottom layer force of experimental substructure was calculated and fed back to the numerical substructure to obtain the acceleration response of the building and masts. Ten test conditions of WTSHS with different wind angle (0°-90°) were conducted to reproduce the acceleration responses at specific location, which are close to the acceleration response obtained from the field measurements. The WTSHS's capability to replicate the wind-induced vibrations in buildings offers a novel experimental approach to investigate the dynamic responses of tall structures in the future.
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