Some shortcomings of the dynamic testing methods for structural concrete bridge assessment are discussed. For the purpose three RC beams, which can be considered as 1:5 scale models of real structures, have been built, artificially damaged and subjected to dynamic tests in the laboratory. The results showed that the classical modal parameters (i.e. eigenfrequencies and mode shapes) are often poor damage indicators. The quality of the results is affected by the low sensitivity of the dynamic properties to localized damage, by the weak correlation between stiffness and load bearing capacity, by the effects of the environment conditions and by the need of information about the dynamic properties of the undamaged structures.
Reliability of Dynamic methods for evaluating structural concrete bridge integrity
MATERAZZI, Annibale Luigi;BRECCOLOTTI, Marco
2004
Abstract
Some shortcomings of the dynamic testing methods for structural concrete bridge assessment are discussed. For the purpose three RC beams, which can be considered as 1:5 scale models of real structures, have been built, artificially damaged and subjected to dynamic tests in the laboratory. The results showed that the classical modal parameters (i.e. eigenfrequencies and mode shapes) are often poor damage indicators. The quality of the results is affected by the low sensitivity of the dynamic properties to localized damage, by the weak correlation between stiffness and load bearing capacity, by the effects of the environment conditions and by the need of information about the dynamic properties of the undamaged structures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
