Abstract

GODFREY MONTERO, Richard; SCHMIDT DIAZ, Víctor; ESQUIVEL SALAS, Luis C.  and  LIU KUAN, Yi Cheng. Identification of torsional modes using ambient vibrations and spectral analysis in two reinforced concrete structures. Ing. sísm [online]. 2020, n.spe104, pp.72-99.  Epub Mar 10, 2021. ISSN 0185-092X.  https://doi.org/10.18867/ris.104.552.

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.

Keywords : operational modal analysis; ambient vibrations; torsional effect; structural dynamics.

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