Moussaoui, S.E.

THE USE OF RITZ VECTORS IN A COMPARATIVE STUDY FOR VIBRATORY ANALYSIS OF DAM-FOUNDATION SYSTEMS

Abstract eng:
An investigation of the free vibration behaviour of soil - structure systems is conducted by using conjointly the sub-structure method and the orthogonal Ritz vector procedure. Two soil-dam dynamic interaction models are successively examined for that purpose. Two extreme hypothetical cases of rigid and flexible soil-foundation behaviour are considered. The results obtained in this study, show clearly that the load dependent Ritz vector basis is more efficient than that of the exact eigenvectors in terms of accuracy and convergence, regardless of the dynamic interaction models and more importantly for the rigid behaviour of soil-dam systems. Furthermore, an empirical rule is proposed in order to accurately estimate the number of the first P eigenmodes of the complete system soil-dam of order N, from a limited vibration mode number of the reduced system of size L (L<

Contributors:

Achour, B.

Publisher:

Columbia University in the City of New York

Conference Title:

Proceedings of the 15th ASCE Engineering Mechanics Division Conference

Conference Title:

15th ASCE Engineering Mechanics Division Conference

Conference Venue:

New York (US)

Conference Dates:

2002-06-02 / 2002-06-05