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Acoustoelastic Effects on the Resonance Frequencies of Prestressed Concrete Beams – Short-term Measurements

Lundqvist, Peter LU and Rydén, Nils LU (2012) In Ndt & e International 50. p.36-41
Abstract
In this study resonant acoustic spectroscopy was applied during static loading and unloading of three prestressed concrete beams in the context of acoustoelasticity. At each load step multiple modes of vibration were measured using an accelerometer and a small impact source. It was found that the measured resonance frequencies increased with increasing compressive stress in a manner which can be predicted using a non-linear finite element model based on Murnaghan's third order elastic theory. Previous results from experimental studies on concrete bridges indicate that measured structural resonance frequencies increase with increasing prestress forces. These results have been difficult to explain theoretically and the results from this... (More)
In this study resonant acoustic spectroscopy was applied during static loading and unloading of three prestressed concrete beams in the context of acoustoelasticity. At each load step multiple modes of vibration were measured using an accelerometer and a small impact source. It was found that the measured resonance frequencies increased with increasing compressive stress in a manner which can be predicted using a non-linear finite element model based on Murnaghan's third order elastic theory. Previous results from experimental studies on concrete bridges indicate that measured structural resonance frequencies increase with increasing prestress forces. These results have been difficult to explain theoretically and the results from this study can possibly provide a new theoretical basis for the observed stress dependency of the resonance frequencies of concrete structures. Furthermore, the results indicate that a change in the state of stress in a concrete structure can be detected or monitored by measuring one or several resonance frequencies. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
KstrConcrete, Acoustoelasticity, Resonance frequency, Prestressed concrete
in
Ndt & e International
volume
50
pages
36 - 41
publisher
Elsevier
external identifiers
  • wos:000306162700005
  • scopus:84862126392
ISSN
0963-8695
DOI
10.1016/j.ndteint.2012.04.010
language
English
LU publication?
yes
id
e21535d6-0c17-4969-9e94-dbcce4ff0ee3 (old id 2797984)
date added to LUP
2012-06-18 08:58:09
date last changed
2017-09-17 04:23:47
@article{e21535d6-0c17-4969-9e94-dbcce4ff0ee3,
  abstract     = {In this study resonant acoustic spectroscopy was applied during static loading and unloading of three prestressed concrete beams in the context of acoustoelasticity. At each load step multiple modes of vibration were measured using an accelerometer and a small impact source. It was found that the measured resonance frequencies increased with increasing compressive stress in a manner which can be predicted using a non-linear finite element model based on Murnaghan's third order elastic theory. Previous results from experimental studies on concrete bridges indicate that measured structural resonance frequencies increase with increasing prestress forces. These results have been difficult to explain theoretically and the results from this study can possibly provide a new theoretical basis for the observed stress dependency of the resonance frequencies of concrete structures. Furthermore, the results indicate that a change in the state of stress in a concrete structure can be detected or monitored by measuring one or several resonance frequencies.},
  author       = {Lundqvist, Peter and Rydén, Nils},
  issn         = {0963-8695},
  keyword      = {KstrConcrete,Acoustoelasticity,Resonance frequency,Prestressed concrete},
  language     = {eng},
  pages        = {36--41},
  publisher    = {Elsevier},
  series       = {Ndt & e International},
  title        = {Acoustoelastic Effects on the Resonance Frequencies of Prestressed Concrete Beams – Short-term Measurements},
  url          = {http://dx.doi.org/10.1016/j.ndteint.2012.04.010},
  volume       = {50},
  year         = {2012},
}