Nonlinear dynamic structural analysis of tall buildings considering the nondeterministic wind-induced actions

Resumo

In recent decades, technological advances in civil construction have driven the project and construction
of tall buildings in several countries around the world. However, the structural design slenderness increasing has
been crucial for reducing the natural frequencies values and the damping structural levels generating, in some
situations, excessive vibrations and human discomfort. Aspects generally disregarded in current day-to-day design
practice are related to the geometric nonlinearity effect and the soil-structure interaction on the tall buildings
structural response. Thus, this investigation aims to evaluate the dynamic structural behaviour of a steel-concrete
composite building with 48 floors and 172.8 m height, when subjected to wind nondeterministic actions, including
in the dynamic analysis the geometric nonlinearity effects and the soil-structure interaction. The investigated
building numerical model was developed to obtain a more realistic representation of the structural system, based
on the Finite Element Method (FEM), using the ANSYS program. In this investigation, the found results, based
on the calculated displacements and accelerations values, have indicated relevant differences, when the geometric
nonlinearity effects and the soil-structure interaction were included in the building dynamic response assessment.