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Titolo:
Comparison of techniques for modal analysis of concrete structures
Autore:
Ndambi, JM; Peeters, B; Maeck, J; De Visscher, J; Wahab, MA; Vantomme, J; De Roeck, G; De Wilde, WP;
Indirizzi:
Royal Mil Acad, Dept Civil Engn, B-1000 Brussels, Belgium Royal Mil Acad Brussels Belgium B-1000 il Engn, B-1000 Brussels, Belgium Katholieke Univ Leuven, Dept Civil Engn, B-3001 Heverlee, Belgium Katholieke Univ Leuven Heverlee Belgium B-3001 B-3001 Heverlee, Belgium Free Univ Brussels, Dept Mech Mat & Construct, B-1050 Brussels, Belgium Free Univ Brussels Brussels Belgium B-1050 uct, B-1050 Brussels, Belgium
Titolo Testata:
ENGINEERING STRUCTURES
fascicolo: 9, volume: 22, anno: 2000,
pagine: 1159 - 1166
SICI:
0141-0296(200009)22:9<1159:COTFMA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
VIBRATION;
Keywords:
modal analysis; modal parameter; reinforced concrete; dynamic measurement; dynamic characteristics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Ndambi, JM Royal Mil Acad, Dept Civil Engn, 30 Renaissance Ave, B-1000 Brussels, Belgium Royal Mil Acad 30 Renaissance Ave Brussels Belgium B-1000 gium
Citazione:
J.M. Ndambi et al., "Comparison of techniques for modal analysis of concrete structures", ENG STRUCT, 22(9), 2000, pp. 1159-1166

Abstract

This paper describes different experimental techniques for obtaining modalparameters of structures. Attention is focused on those techniques that may be applicable to in situ concrete structures (e.g. bridges). In a first stage, experiments are made on reinforced concrete beams of 6 meters length. The beams are excited using three types of excitation methods: impact hammer excitation and two different electromagnetic shaker signals: pseudo-random and swept-sine signals. The modal parameters are determined either by performing curve-fitting procedures on series of measured frequency response functions or by applying the stochastic subspace identification technique to the time response signals of the structure. The influence of the non-linear behaviour of the concrete beams is investigated by performing measurements at different excitation amplitudes. It appears that modal parameter estimates are affected by excitation techniques, data acquisition parameters and processing methods. The main cause of this is the non-linear behaviour which is observed even at very low vibration amplitudes. However, the influence on resonant frequencies and mode shapes is negligible. This is not the case for the modal damping ratios, so that the estimation of these parameters is unreliable. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 21:01:05