Modal Analysis of a Reinforced Concrete Frame in Various States of Damage

Abstract:

Article Preview

The purpose of this paper is to report selected results of an experiment in which two, natural size r/c frames were put on shaking table and subjected to a sequence of seismic excitations with increasing intensity interlaced with low level, diagnostic tests. The shaking table experiment aimed at working out new methodology for monitoring vibrations of r/c structures to assess their state. Characteristic decrease of natural frequencies and increase of structural damping was observed and analyzed in detail. It was interesting to note 20 per cent drop in natural frequencies prior to visual detection of any cracks.

Info:

Periodical:

Key Engineering Materials (Volumes 293-294)

Edited by:

W.M. Ostachowicz, J.M. Dulieu-Barton, K.M. Holford, M. Krawczuk and A. Zak

Pages:

735-742

DOI:

10.4028/www.scientific.net/KEM.293-294.735

Citation:

Z. Zembaty and M. Kowalski, "Modal Analysis of a Reinforced Concrete Frame in Various States of Damage ", Key Engineering Materials, Vols. 293-294, pp. 735-742, 2005

Online since:

September 2005

Export:

Price:

$35.00

[1] G. Franz, H. Brener: Verformungsversuche an Stahlbetonbalken mit hochfasten Bewerungsstahl, Deutscher Ausschus für Stahlbeton, H. 188/(1967).

[2] Z. Zembaty: Journal of Structural Engineering, ASCE Vol. 123 (1997), p.479.

[3] Jędrzejczak M., Knauff M: Archives of Civil Engineering Vol. 43(1) (1997), p.7.

[4] J. Penzien, R.K. Hansen: ACI Journal, Proceedings Vol. 50 (1954), p.545.

[5] R. Jones: Magazine of Concrete Research Vol. 9 (1957), p.69.

[6] W. Goodsmith, M. Polivka, T. Yang: Experimental Mechanics Vol. 6 (1966), p.65.

[7] S.W. Doebling, C.R. Farrar, M.B. Prime, D.W. Shevitz: Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: a literature review (Los Alamos National Laboratory Report LA-13070- MS, 1996).

DOI: 10.2172/249299

[8] H. Sohn, C.R. Farrar, F.M. Hemez, D.D. Shunk, D.W. Stinemates and B.R. Nadler: A Review of Structural Health Monitoring Literature: 1996-2001 (Los Alamos National Laboratory Report, LA-13976-MS, 2004).

[9] Ton-Lo-Wang, Zhouthong Zong: Improvement of evaluation method for existing highway bridges (Research report n° FL/DOT/RMC/6672-818, Dept of Civil and Environment Engineering, Florida Int. University, Miami (FL), USA 2002).

[10] Structural Health Monitoring Studies of the Alamosa Canyon and I-40 Bridges (Los Alamos National Laboratory Report, LA-13635-MS, 2000).

[11] Z. Wang, Man, X-T.C., R.D. Finch, B.H. Jansen: Journal of Testing and Evaluation Vol. 26 (1998), p.405.

[12] J. -M. Ndambi, J. Vantomme, K. Harri: Engineering Structures Vol. 24 (2002), p.501.

[13] M. Kowalski: Problems of dynamic identification of cracked reinforced concrete structures (Ph.D. thesis Technical University of Opole, 2003).

[14] M. Kowalski: Retrieving natural vibration modes of structures from full scale shaking table experiments (to appear in Proceedings of SECED Young Engineers Conference, University of Bath, Bath, UK 2005).

In order to see related information, you need to Login.