engleski

3-D wind-induced effects on bridges during balanced cantilever erection stages

Nowadays balanced cantilever construction plays an essential role as a sophisticated erection technique of bridges due to its economical and ecological advantages. Experience teaches that wind has a great importance with regard to this construction technique, but methods proposed by codes to take wind effects into account are still rather crude and, in most cases, completely lacking. Also research in this field is quite limited and aimed at studying only the longitudinal shear and the torque at the pier base, caused by the mean wind velocity and by the longitudinal turbulence actions over the deck. This paper advances the present solutions by developing a new procedure that takes into account all wind effects both on the deck and on the pier. The proposed model assumes the mean wind velocity as ortogonal to the bridge plane and considers the effects produced by all the three turbulence components and by the vortex shedding. The aplications point out the role of each loading component on different bridge configurations and show that disregarding the presence of some effects may imply oversimolified results and relevant understimations.

alongwind vibrations; atmospheric turbulence; bridges; cantilever erection stages; crosswind vibrations; maximum response; torsional vibrations; vortex shedding; wind engineering; 3D wind-induced effects

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