Avaliação da resposta estrutural dinâmica de edifícios em aço com base em monitoração experimental e modelagem numérica

Abstract

In this work, the dynamic response of a 5-story steel building constructed in laboratory was determined based on dynamic experimental monitoring and numerical analyses. The dynamic experimental monitoring makes possible the extraction of modal parameters (natural frequencies, vibration modes and damping coefficients). These parameters are relevant for the characterization of the structural system, and are calculated based on the accelerations, velocities and displacements experimental signals. To validate the dynamic response, both numerical and experimental results were correlated and presented in terms of modal parameters, time history functions and frequency response functions (FRFs). This way, the numerical model used for the steel building dynamic analysis adopted the usual mesh refinement techniques present in finite element modelling (FEM) simulations implemented in the ANSYS program. The floor steel columns were represented by three-dimensional gantry elements, where flexural and torsional effects are considered, and the slabs were represented by shell elements. A forced vibration analysis was carried out and the dynamic response of the building, when subjected to impact loads, was compared with the actual structural response of the steel building model. Based on the good agreement between the numerical and experimental results, the conclusions emphasize the relevance of the dynamic experimental monitoring in order to characterize and adjust the developed FEM of the building.