Analysis of Dynamic Parameters of Observation Towers in Latvia
DOI:
https://doi.org/10.17770/etr2013vol2.847Keywords:
acceleration, frequency, human induced vibrations, observation towerAbstract
The purpose of this research is to experimentally identify the performance of most of the light-weight observation towers open for public in Latvia. It analyzes the structure of towers, technical condition, dynamic parameters and dynamic response to human movement along the tower height. During the experiment there were measured and recorded the vibration accelerations of 18 observation towers’ upper platform. Further dynamic parameters were extracted using the spectral analysis. There was performed the sensitivity analysis to establish parameters that most influences the dynamic response amplitudes due to human movement. All experimentally obtained fundamental frequencies of the inspected towers are in the typical range of human walking frequencies. It is found that the main parameter that denotes the response level (acceleration amplitude) of the tower due to human movement is a tower self-weight.Downloads
References
L. Gaile. and I. Radinsh, Eccentric lattice tower response to human induced dynamic loads. Proceedings of 19th International Congress on Sound and Vibration, July 8-12, 2012, Vilnius, Lithuania, CD-ROM, pp. 560-567, 2012.
E. T. Ingolfsson and C.T. Georgakis, “A stochastic load model for pedestrian – induced lateral forces on footbridges”, Engineering Structures, 33, pp. 3454-3470, 2011.
F. Venuti and L. Bruno, “Crowd – structure interaction in lively footbridges under synchronous lateral excitation: A literature review”, Physics of Life Reviews, 6, pp. 176–206, 2009.
S. Zivanovic, A. Pavic and P. Reynolds “Vibration Serviceability of Footbridges under Human – Induced Exitation: A Literature Review”, Journal of Sound and Vibration, 279 (1-2), pp. 1–74, 2004.
S. Zivanovic and A. Pavic, “Probabilistic assessment of human response to footbridge vibration”, Journal of Low Frequency Noise, Vibration and Active Control, Vol. 28(4), pp. 255-268, 2009.
C. Butz, M. Feldmann and et.al., “Advanced load models for synchronous pedestrian excitation and optimised design guidelines for steel footbridges,” European Commission,Research Fund for Coal and Steel, European Communities, Tech. Rep., 2008.
T. Kretz, A. Grunebohm, and et. al., “Upstairs Walking Speed Distributions on a Long Stair-way”, Safety Science, 46, pp. 72-78, 2008.
W. Heylen, S. Lammens and P. Sas, Modal analysis theory and testing. Leuven: Katholieke Universiteit Leuven, 2007.
H. A. Büchholdt and S. E. M. Nejad, Structural Dynamics for Engineers. ICE Publishing: UK, 2011.
L. Gaile. and I. Radinsh, Lattice tower dynamic performance under human induced loading. Proceedings of 11th International Conference on Recent Advances in Structural Dynamics, July 1-3, 2013, Pizza, Italy, accepted for publishing, 2012.
M. J. Griffin, Handbook of Human Vibration. Elsevier Ltd., 2004.
