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Reliability of dynamic identification techniques connected to structural monitoring of monumental buildings
Author(s) -
Podestà Stefano,
Riotto Giuseppe,
Marazzi Francesco
Publication year - 2008
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.219
Subject(s) - reliability (semiconductor) , identification (biology) , structural health monitoring , structural engineering , dynamic testing , masonry , structural dynamics , engineering , vibration , computer science , finite element method , acoustics , power (physics) , botany , physics , quantum mechanics , biology
The impossibility of adjusting the monumental buildings to the protection levels adopted for newly conceived buildings brings about the need to accept lower safety levels. In such case, the potentiality of dynamic monitoring by means of periodic checks on the dynamic characteristics of the structure (its own frequencies and vibration modes) would allow, at least theoretically, one to check globally that there are no changes to the boundary conditions that would further diminish the structural safety level. To this end, the dynamic analyses of a masonry triumphal arch of a medium‐sized church are reported in this paper. The dynamic identification campaign was carried out at the ELSA Laboratory, studying the in‐plane behaviour of the structure in undamaged and damaged conditions. The dynamic identification campaign, which lasted more than 6 months, allowed us to test the reliability of different acquisition systems, of different typologies of excitation and above all of evaluating the influence of environmental conditions on the dynamic parameters that may be identified. Indeed, variation of the environmental factors (e.g. temperature, insolation, humidity) may determine a change of the structure's own frequencies that must be taken into consideration just so as to be able to recognize the variations that may be correlated to a structural change due to the presence of damage. Copyright © 2007 John Wiley & Sons, Ltd.