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Modal parameter variations could be used to detect damage, or even to evaluate the level of retrofitting achieved on a monument. On fragile structures, even the accuracy of the instruments is often sufficient to detect modal variations it is important to perform statistics measurements and when possible on different configurations. In effect, possible errors are not always easy to detect by theory, and often due to spurious effects independent of the structure itself could conduct to wrong results.

Here are presented the results of an experimental campaign conducted on brick masonry walls. The modal parameter variations allow a good evaluation of the stiffness benefit for different reinforcement, taking into account the standard deviation of the measurements. A second part is dedicated to damage detection of masonry walls destructed by important cyclic loads. The measurement of the phase of the signals brought promising results in the direction of relating damage detection by modal signal analysis.

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Additional information

Authors: TIRELLI D ET AL, European Commission, Joint Research Centre, Institute for the Protection and the Security of the Citizen, European Laboratory for Structural Assessment, Ispra (IT)
Bibliographic Reference: An oral report given at: International Conference on Structural Dynamics Modelling Organised by: Vibrations Group - DEM, Technical University of Lisbon Held at: Madeira (PT), 3-5 June, 2002
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