Identification of Dynamic Properties of a Reduced-Scale Physical Model of a Slab Bridge Through Vibration Recording

Authors

  • Germán N. Lucero Universidad Nacional de Rosario, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Instituto de Mecánica Aplicada y Estructuras (IMAE). Rosario, Argentina.
  • Oscar Möller Universidad Nacional de Rosario, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Instituto de Mecánica Aplicada y Estructuras (IMAE). Rosario, Argentina.
  • Juan P. Ascheri Universidad Nacional de Rosario, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Instituto de Mecánica Aplicada y Estructuras (IMAE). Rosario, Argentina.

DOI:

https://doi.org/10.70567/mc.v41i9.44

Keywords:

Structural dynamics, System identification, Physical model, Dynamic parameters, Measurement errors

Abstract

Structural health monitoring (SHM) aims at early detection of damage in structural systems. An important step in this process is the identification of dynamic properties such as natural frequencies and modal shapes. In this work, a physical scale model of a slab bridge is studied. Acceleration-time is recorded at 26 points with 3 accelerometers. The dynamic action is a very short duration impact, applied at a point where it generates participation of several modes, with the aim of recording the free vibration stage that facilitates the identification of frequencies and modal shapes by methods in the frequency domain and in the time domain. The results are compared with those obtained from a numerical model applying finite elements within the linear elastic field. It is concluded that the methods in the frequency domain and in the time domain have a good correlation in the lower modes while there is a greater dispersion in the higher modes.

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Published

2024-11-08

Issue

Vol. 41 No. 9 (2024): Structural Dynamics (B)

Section

Conference Papers in MECOM 2024

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Copyright (c) 2024 Argentine Association for Computational Mechanics

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