ON DYNAMICS OF LIFT BRIDGE

Abstract eng:
The paper deals with probabilistic analysis in dynamics. The Botlek bridge (Rotterdam, Holland) – one of the largest vertical movable lift bridges in the world is analyzed. The structure of the bridge consists of six reinforced concrete pylons and two large (94 m x 49 m each) steel decks connected through ropes with counterweights. The bridge system is in dynamic mode during movement of the decks and the counterweights, under the action of wind and earthquakes, under traffic loads in operation position. The real bridge structure has a high level of importance and accordingly not only deterministic analyses were carried out but also stochastic analyses were required. The paper focuses the probabilistic analysis as the base of dynamic study in the design process of the bridge. The results had a high significance for practical application and for design of the bridge. The uncertainties of pylon and deck: stiffness and weight were taken into account in the probabilistic simulation method.

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