JOURNAL OF THEORETICAL AND APPLIED MECHANICS

ISSN 1429-2955

Quarterly (issued since 1963)

WARSAW

Published by Polish Society of Theoretical and Applied Mechanics

JTAM is devoted to original theoretical, experimental papers and surveys, scientific information. It contains also reports on the Polish Society of Theoretical and Applied Mechanics activities, on Congresses, Conferences and Symposia.

Advisory Board

Marek Dietrich (Poland) - President

Jorge A.C. Ambrosio (Portugal), Angel Baltov (Bulgaria), Romesh C. Batra (USA), Alain Combescure (France), Juri Engelbrecht (Estonia), Józef Kubik (Poland), Jerzy Maryniak (Poland), Zenon Mróz (Poland), Zbigniew Olesiak (Poland), Ryszard Parkitny (Poland), Bogdan Skalmierski (Poland), Bertil Storakers (Sweden), Jacek Stupnicki (Poland), Dieter Weichert (Germany), Jose E. Wesfreid (France), Piotr Wilde (Poland), Józef Wojnarowski (Poland), Joseph Zarka (France), Vladimir Zeman (Czech Republic), Michał Życzkowski (Poland)

Editorial Board

Wojciech Nowacki - Editor-in-Chief, Lech Dietrich, Witold Gutkowski, Wiesław Sobieraj, Lech Solarz, Andrzej Styczek, Andrzej Tylikowski, Czesław Wozniak, Ewa Koisar - Secretary

Editorial Office

Faculty of Civil Engineering

Warsaw University of Technology

Al. Armii Ludowej 16, r.650

00-637 Warszawa, Poland

Phone/Fax. 48*22 825-71-80

e-mail: biuro@ptmts.org.pl

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23.01.2006