Study on structural damage and falling of glass curtain wall of super high-rise building under coupling action of wind and earthquake

Considering the long service life of the structure and the possibility of simultaneous actions of wind and earthquake in the whole life cycle, the individual and coupled actions of wind and earthquake loads of the main structure and glass curtain wall was studied. Based on a 300.5 m super high-rise frame-core wall structure, a finite element analysis model was built by adding the glass curtain wall according to the codes. Three groups of three-dimensional ground motion records were selected according to the site conditions, and the wind pressure time-history of 10 years, 50 years, and 100 years return periods was obtained through a 1∶440 scale wind tunnel model test. Subsequently, the effects of the individual and coupled actions of wind and earthquake on the behavior of the main structure and glass curtain wall were studied by the nonlinear dynamic analysis method. The results show that the influence of the main structure on the glass curtain wall was greater than that of the glass curtain wall on the main structure. The inter-story deformation of the main structure was larger than the deformation of the glass curtain wall itself. Under the individual actions of wind and earthquake, the nonlinear response of the main structure and the failure range of the glass curtain walls increased with increasing load. Under the earthquake action, the structure was damaged and the growth of structural top displacement and story drift was greater than that of the base shear force but less than the growth of top acceleration. Under the action of wind, the main structure was kept in the elastic stage, and the base shear and the overturning moment increased linearly. For the deformation response characteristics, the torsional effect increased and the deformation increased nonlinearly. Under the coupling action of wind and earthquake, the nonlinear response of the main structure and glass curtain wall was greater than the simple superposition of wind and earthquake alone. The top displacement and the maximum story drift were 110%~134% of the sum of wind and earthquake alone. The failure of the glass curtain wall is more likely to occur on the reinforced layer, the nearby 1~2 layers, and the side suction surface which needs to be enhanced in design.