Experimental analysis of frequency tuning influence on the response stability of bridge girders under wind action

0361436 - ÚTAM 2012 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Král, Radomil - Pospíšil, Stanislav - Náprstek, Jiří
Experimental analysis of frequency tuning influence on the response stability of bridge girders under wind action.
Proceedings of 13th International Conference on Wind Engineering. Amsterdam: Multi-Science Publishing Co Ltd, 2011 - (Geurts, C.), s. 1-8. ISBN 978-1-907132-33-9.
[International conference of wind engineering /13./. Amsterdam (NL), 10.07.2011-15.07.2011]
Grant CEP: GA ČR(CZ) GA103/09/0094; GA AV ČR(CZ) IAA200710902
Výzkumný záměr: CEZ:AV0Z20710524
Klíčová slova: wind tunnel analysis * sectional bridge girders * stability
Kód oboru RIV: JM - Inženýrské stavitelství

In this article, a wind tunnel analysis of a double-degree-of-freedom (DDOF) system represented by sectional bridge girders is carried out. The analysis is focused on the influence of the natural frequencies ratio on the initiation of unstable vibration. The article also discusses experimentally ascertained response regimes, with an emphasis on their stability character. The assessment of the response is based on the hysteresis loops and separation curves determining the stability boundaries. The influence of initial disturbance on the stability is examined. Two types of girder were investigated: (i) rectangular cross-section with the aspect ratio 1:5, and, (ii) bridge-like girder with analogous principal dimensions. For both types of decks, the limits of the stability are significantly affected by initial disturbance.
Trvalý link: http://hdl.handle.net/11104/0198747