Análisis de métodos OMA para la extracción de parámetros modales sobre edificios existentes

Abstract

This paper presents the application of Operational Modal Analysis (OMA) methods in order to characterize the modal parameters (i.e., frequencies and vibration modes) of a building. The study was carried out on a real scenario. In particular, the Frequency Domain Decomposition (FDD) method and its enhanced version (EFDD) were used. In a first stage, a preliminary structural evaluation of the building (using the rapid visual inspection method, RVS), a dimensional survey and field tests for the mechanical characterization of its components were carried out, for the purpose of obtaining a conventional modal analysis in terms of its modal parameters. Based on this modal analysis, an instrumentation plan was designed with triaxial MEMS accelerometers (microelectromechanical systems). The instrumentation process was comprised of three stages: acquisition, control and storage of information. The main contribution of this work consists of the evaluation of the application of the FDD and EFDD methods on an essential building, with the particularity of the use of microseismicity vibrations for the identification of modal parameters. Results obtained reveal a fundamental frequency of the building of 1.43 Hz, as well as a non-recommended modal behavior.