effects of geometric nonlinearity and aerodynamic damping on the dynamic structural response of tall buildings: a case study

This research work aims to assess the dynamic structural behaviour of tall buildings when subjected to wind loads considering the effect of the geometric nonlinearity and the aerodynamic damping, due to the relative movement between the structure and the wind. this way, a case study associated to a steel–concrete composite building with 48 floors and 172.8 m height is considered to investigate the dynamic response of tall buildings when subjected to wind nondeterministic actions. the effects of the geometric nonlinearity and the aerodynamic damping are included in the dynamic analysis. a numerical model of the investigated building was developed in order to obtain a more realistic representation of the structural system based on the modelling of the effect of the soil-structure interaction. the building finite element model was developed based on the use of modelling techniques, adopting the mesh refinement present in the finite element method (fem) and implemented in the ansys software. based on the displacements and accelerations values, this study concluded that the effect of the geometric nonlinearity led to relevant differences on the investigated building dynamic structural response, with maximum differences in the range of 5% to 30% to the horizontal translational displacements and 15% to 45% to accelerations, taking into account a wind basic velocity range from 5 m/s [18 km/h] up to 45 m/s [162 km/h]. on the other hand, the contribution of the effect of the aerodynamic damping was not significant, with maximum differences up to 5% to the displacements and up to 10% for the accelerations.