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In this investigation, a spectral analysis of the structural response of two reinforced concrete buildings, of 18 m and 56 m of height and with different plan regularity, subjected to ambient vibrations was done. Specifically, natural frequencies and modes of vibrations were determined through applying basic frequency domain (BFD) and frequency domain decomposition (FDD) methods to ambient vibration data acquired by three triaxial accelerometers. At least three vibration modes were identified for each building in a range of frequencies comprehended between 1,0 Hz and 6,0 Hz. Modes with more spectral density were exhibited between frequencies of 1,0 Hz and 3,0 Hz. From mode shapes, it was determined that structures with more plan irregularity presents more torsional modes and coupling of these with flexural modes.

IDENTIFICACIÓN DE MODOS DE TORSIÓN EMPLEANDO LA MEDICIÓN DE VIBRACIONES AMBIENTALES Y EL ANÁLISIS ESPECTRAL EN DOS EDIFICIOS DE CONCRETO REFORZADO