Experimental modal analysis of diagonal members

Michal Venglar1 , Milan Sokol2

1, 2Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Bratislava, Slovak Republic

1Corresponding author

Vibroengineering PROCEDIA, Vol. 23, 2019, p. 110-114. https://doi.org/10.21595/vp.2019.20671
Received 13 March 2019; accepted 21 March 2019; published 25 April 2019

Copyright © 2019 Michal Venglar, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract.

Truss bridges are integral part of the transport network, mainly railroads and partially road bridges. The investigated bridge is located in the western part of Slovakia, and it crosses the Vah River. Density of traffic on the bridge is not so high, so the bridge is accessible for repeating dynamic measurements. Many load situations were simulated. Among of them also a case, where one diagonal member was excited by an electromagnetic exciter during the measurements and the influence on other diagonals have been also analyzed. Results of dynamic measurements are shown in this paper in comparison to analytical solution and to FEM calculations.

Graphical Abstract

Highlights
  • Artificial excitation of one diagonal member can excite another diagonal member to the resonant frequency
  • The FEM model prepared by using mainly BEAM elements can be used for comparison of global mode-shapes
  • On the other hand, neglecting structural details can lead to a mismatch of experimentally obtained and calculated natural frequency

Keywords: truss bridge, NDT testing, artificial exciter, natural frequency, local mode-shape.

Acknowledgements

This paper was supported by the Slovak Research and Development Agency (SRDA), i.e. a grant from research program No. APVV-0236-12. It was also supported by VEGA No. 1/0749/19.

References

  1. Limongelli M. P., Chatzi E., Anžlin A. Condition assessment of roadway bridges: from performance parameters to performance goals. The Baltic Journal of Road and Bridge Engineering, Vol. 13, Issue 4, 2018, p. 345-356. [Publisher]
  2. Caglayan O., Ozakgul K., Tezer O. Assessment of existing steel railway bridges. Journal of Constructional Steel Research, Vol. 69, Issue 1, 2012, p. 54-63. [Publisher]
  3. Costa J. A. B., Figueiras J. A. Rehabilitation and condition assessment of a centenary steel truss bridge. Journal of Constructional Steel Research, Vol. 89, 2013, p. 185-197. [Publisher]
  4. Yoshioka T., et al. Damage assessment of truss diagonal members based on frequency changes in local higher modes. Procedia Engineering, Vol. 14, 2011, p. 3119-3126. [Publisher]
  5. Shibeshi R. D., Roth C. P. Field measurement and dynamic analysis of a steel truss railway bridge. South African Institution of Civil Engineering, Vol. 58, Issue 3, 2016, p. 28-36. [Publisher]
  6. Bayraktar A., Altunisik A. C., Turker T. Structural health assessment and restoration procedure of an old riveted steel arch bridge. Soil Dynamics and Earthquake Engineering, Vol. 83, 2016, p. 148-161. [Publisher]
  7. Čech J., et al. Structural condition assessment of the bridge in Ostrava. MATEC Web of Conferences, 2017. [Publisher]
  8. Favai P., et al. Bridgemon: Improved Monitoring Techniques for Bridges. Civil Engineering Research in Ireland Belfast, UK, 2014, p. 179-184. [CrossRef]
  9. Salawu O. S. Detection of structural damage through changes in frequency: a review. Engineering Structures, Vol. 19, Issue 9, 1997, p. 718-723. [Publisher]
  10. Comisu C.-C., Taranu N., Boaca G., Scutaru M.-C. Structural health monitoring system of bridges. Procedia Engineering, Vol. 199, Issue 2017, 2017, p. 2054-2059. [Publisher]
  11. Venglar M., Sokol M., Ároch R. System identification of a truss beam. 22nd International Conference on Engineering Mechanics, 2016, p. 573-576. [CrossRef]
  12. Venglar M., Sokol M., Ároch R. Ambient vibration measurements of steel truss bridges. Journal of Measurements in Engineering, Vol. 6, Issue 4, 2018, p. 234-239. [Publisher]
  13. Thorby D. Structural Dynamics and Vibration in Practice: an Engineering Handbook. Butterworth-Heinemann, Amsterdam, 2008. [Publisher]
  14. Clough R., Penzien J. Dynamics of Structures. McGraw-Hill, New York, 2004. [CrossRef]
  15. Bendat Piersol J. A. Random Data. Wiley, Hoboken, 2010. [Publisher]