Abstract
As part of a programme of structural integrity assessment, an electricity transmission tower was instrumented with an anemometer, strain gauges, thermocouples and accelerometers and its performance monitored for one year. The monitoring system emailed statistics of wind, strain, temperature and acceleration data daily together with modal parameters automatically identified with operational modal analysis. Extremely large diurnal changes in the natural frequencies of the tower were observed with the first mode varying between approximately 0.8 Hz and 3.0 Hz and the second mode varying between approximately 2.8 Hz and 6.0 Hz. Unexpected bending of the leg members was also observed. The diurnal changes in modal parameters and bending strains of the leg members were correlated with temperature. The changes in the performance of the tower were investigated numerically through analysis of the changes in tension of the conductors due to temperature and a finite element model of the tower. The bending strains induced in the legs were large enough to be important in the integrity assessment. The measured dynamic performance of the tower implies that a structural health monitoring paradigm based on modal parameter changes must be able to account for large shifts due to environmental variability.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
1 Maguire John R., Residual life assessment of electricity pylons – a case study, Key Engineering Materials Vols. 413-414 (2009) pp 219-228
2 Maguire John R., Risk-based residual life assessment – a case study, Key Engineering Materials Vols. 245-246 (2003) pp 359-366
3 Y. Momomura, H. Marukawa, T. Okamura, E. Hongo, T. Ohkuma Full-scale measurements of wind-induced vibration of a transmission line system in a mountainous area, Journal of Wind Engineering and Industrial Aerodynamics 72 (1997) 241 252.
4 H. Yasui, H. Marukawa, Y. Momomura, T. Ohkuma Analytical study on wind-induced vibration of power transmission towers, Journal of Wind Engineering and Industrial Aerodynamics 83 (1999) 431}441.
5 P. Harikrishna, J. Shanmugasundaram, S. Gomathinayagam, N. Lakshmanan, ‘Analytical and experimental studies on the gust response of a 52 m tall steel lattice tower under wind loading Computers and Structures 70 (1999) 149 -160
6 Ronaldo C. Battista, Rosângela S. Rodrigues, Michèle S. Pfeil Dynamic behavior and stability of transmission line towers under wind forces Journal of Wind Engineering and Industrial Aerodynamics 91 (2003) 1051–1067
7 A.M. Loredo-Souza, A.G. Davenport The influence of the design methodology in the response of transmission towers to wind loading Journal of Wind Engineering and Industrial Aerodynamics 91 (2003) 995–1005
8 Brownjohn J.M.W., Carden E.P., Goddard C.R. and Oudin, G. (2010) Real time performance monitoring of tuned mass damper system for a 183m reinforced concrete chimney. Journal of Wind Engineering and Industrial Aerodynamics Vol. 8, No. 3, March, pp. 169-179.
9 Brownjohn, J. M. W. and Carden, P. (2008) Real-time operation modal analysis of Tamar Bridge. 26th International Modal Analysis Conference (IMAC XXVI), Orlando, Florida, USA, 4-7 February.
10 Van Overschee P, De Moor B, Subspace Identification for Linear Systems, 1996 Kluwer Academic Publishers, USA, pp254
11 Peeters B, De Roeck G, Reference-Based Stochastic Subspace Identification For Output-Only Modal Analysis, Mechanical Systems and Signal Processing (1999) 13(6), 855-878
12 R. D. Fierro, G. H. Golub, P. C. Hansen, And D. P. O'leary Regularization By Truncated Total Least Squares Siam Journal of Scientific Computing Vol. 18, No. 4, pp. 1223-1241, July 1997.
13 E. Reyndars, G. De Roeck, Reference-based combined deterministic–stochastic subspace identification for experimental and operational modal analysis, Mechanical Systems and Signal Processing 22(3) (2008) 617-637
14 Karoumi R., Some modelling aspects in the nonlinear finite element analysis of cable supported bridges, Computers and Structures, 71, pp.397 – 412, 1999
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 Springer Science+Business Media, LLC
About this paper
Cite this paper
Carden, E.P., Maguire, J.R. (2011). Dynamic Performance and Integrity Assessment of an Electricity Transmission Tower. In: Proulx, T. (eds) Rotating Machinery, Structural Health Monitoring, Shock and Vibration, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9428-8_18
Download citation
DOI: https://doi.org/10.1007/978-1-4419-9428-8_18
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4419-9427-1
Online ISBN: 978-1-4419-9428-8
eBook Packages: EngineeringEngineering (R0)