Guillier Bertrand, Chatelain Jean-Luc, Perfettini Hugo, Oubaiche E., Voisin Christophe, Bensalem R., Machane D., Hellel M. (2016). Building frequency fluctuations from continuous monitoring of ambient vibrations and their relationship to temperature variations. Bulletin of Earthquake Engineering, 14 (8), p. 2213-2227. ISSN 1570-761X.
Titre du document
Building frequency fluctuations from continuous monitoring of ambient vibrations and their relationship to temperature variations
Guillier Bertrand, Chatelain Jean-Luc, Perfettini Hugo, Oubaiche E., Voisin Christophe, Bensalem R., Machane D., Hellel M.
Source
Bulletin of Earthquake Engineering, 2016,
14 (8), p. 2213-2227 ISSN 1570-761X
Building frequencies (fundamental and higher modes) are a critical parameter especially in the field of structural health monitoring mainly based on the stability of the structural dynamic parameters of individual building (frequencies, damping and modes shape). One of the most used methods to find out these parameters is based on the use on ambient vibration analysis. In this work, we study the fluctuations over a month period of the fundamental frequencies (transverse and longitudinal) of a 3.5-story RC-building made of 2 identical units connected by a structural joint. Time independent building frequencies is a strong assumption; as illustrated by our experiment showing that over an observation period of a month, building frequencies fluctuate of about 3.5 %. A clear correlation is found between the building frequency fluctuations and temperature variations, with a phase-shift interpreted as the characteristic time of heat diffusion within the walls. This allows: (1) determining the thermal diffusivity of the structure, (2) inferring its relative stiffness variations, and (3) showing that its Young modulus varies linearly with temperature.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Géophysique interne [066]
