NUMERICAL CHARACTERIZATION OF BUILDING IN STRUCTURAL MASONRY USING MODAL PARAMETERS
Fabiano Eduardo Moraes Matos1; Cláudio José Martins2; Diego Goulart de Lucena2; Marina Fernandes Monteiro2
1 CEFET MG / Banco do Brasil; 2 CEFET MG
doi:10.20906/CPS/CILAMCE2017-0065
Resumo
The proposed article consists of describing a numerical characterization process using modal parameters (vibration modes, natural frequencies and damping rates) of a structural masonry building executed with concrete blocks in 16 floors, with a height of 44 m and its largest face With an area of more than 1619 m², in a region that exposes it to large amounts of winds, thus generating vibrations. The study was carried out with the observation of experimental modal parameters of the structure obtained from the measurement of its vibrations due to the operational actions. For analysis, 53 points were planned distributed on the pavements in such a way that all modes of vibration were measured and the two-hour measurement period was established for each location. In order to validate the technique of obtaining the modal parameters, the procedure was performed in a second tower that composes the third block of the project and has the same structural composition of the building initially evaluated. This exploration campaign was reorganized with the distribution of 18 points with greater concentration in the upper slab and still reducing the duration of the readings to 1 hour of measurement. The comparison of the results of the two towers indicated that the modal experimental parameters obtained showed good convergence validating the proposal of survey for the structures. The numerical model for the characterization of the building was developed based on the structural and architectural projects using software based on MEF generating a final model that presented a total of 45297 fully coupled nodes, 84 with contour restriction, 767 linear elements to represent the straps And 47846 bark elements to represent the masonry, slabs and pillars generating 271,782 equilibrium equations for the calculation of the behavior of the structure. After the initial numerical model, it was verified that the mean error of the modal parameters in relation to the experimental parameters was accentuated. The numerical characterization wa
Palavras-chave: Numerical characterization; modeling with modal parameters; structure dynamics; building vibrations