By C. Bedon, A. Morassi (auth.), Alvaro Cunha (eds.)
Topics in Dynamics of Bridges, quantity three: lawsuits of the 31st IMAC, A convention and Exposition on Structural Dynamics, 2013, the 3rd quantity of 7 from the convention, brings jointly contributions to this crucial sector of study and engineering. the gathering provides early findings and case reports on primary and utilized elements of Structural Dynamics, together with papers on:
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Additional resources for Topics in Dynamics of Bridges, Volume 3: Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
73 Hz. This is a frequency being nicely excited by joggers. 73 Hz is not critical because the respective frequency is not related to the first but to the second bridge mode. This means: Really critical states may occur if the exciting frequency corresponds to the structure’s fundamental frequency and if the mode shape is similar to the static deflection shape forced by the exciter only. 9 Hz. This vibration is easily excited through a jogger’s action. However, the excitation duration is too short to produce a “real” resonance problem.
The bridge has a vertically curved shape, see Fig. 2. Main footbridge part of 180 m length across waterway is a three span suspended steel structure. The longest middle span of 120 m length is hanged by four prestressed tendons over pylons, which are the part of prestressed lateral portals. The axes of the bridge form an triangle cross-section with a vertical plane of symmetry and the lower vertex lying in that plane. 5 (20) mm). The side walls form a triangular tubular diagonals and verticals (133 Â 8, 133 Â 10, 133 Â 16).
Dk A. 1007/978-1-4614-6519-5_4, # The Society for Experimental Mechanics, Inc. T. G. Jørgensen In this paper, the authors present the results from an experimental campaign, aimed at determining the changes in mass and damping of a vertically vibrating footbridge due to pedestrians. e. as the added/subtracted mass or concentrated damping per single pedestrian, at varying amplitudes of vibration and for varying probabilities of occurrence. 2 Methodology The methodology used for the determination of the changes in mass and damping of a footbridge due to pedestrians is conceptually simple.