Studies on failure of transmission line towers in testing

• Published in: Engineering structures Vol. 35; pp. 55 - 70
• Main Authors: Prasad Rao, N., Samuel Knight, G.M., Mohan, S.J., Lakshmanan, N.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-02-2012; Elsevier
• Subjects: Applied sciences; Bearing failure; Building structure; Buildings; Buildings. Public works; Computation methods. Tables. Charts; Construction (buildings and works); Exact sciences and technology; Failure; Finite element method; Hip bracing; Mathematical analysis; Mathematical models; Metal structure; Miscellaneous; Non-linear analysis; Panels; Redundant; Structural analysis. Stresses; Tower testing; Towers; Transmission line towers; Transmission lines; Types of buildings; Redundant; Bearing failure; Tower testing; Transmission line towers; Non-linear analysis; Hip bracing; Metallic structure; Slender structure; Brace; Nonlinear analysis; Experimental study; Failures; Finite element method; Numerical analysis; Transmission line; Failure analysis; Deviation; Pylon; Comparative study
• ISSN: 0141-0296; 1873-7323
• DOI: 10.1016/j.engstruct.2011.10.017

► Premature failure of TL towers during testing and the reasons are discussed. ► FE nonlinear analysis results are compared with the test and codal provisions. ► Significance of detailing deficiencies on the performance of the tower is studied. ► The behavior of a compound member consisting of pair of angles is presented. ► Difficulties in the modeling of construction deficiencies, imperfections, etc., are emphasized.
The towers are vital components of the transmission lines and hence, accurate prediction of their failure is very important for the reliability and safety of the transmission system. When failure occurs, direct and indirect losses are high, leaving aside other costs associated with power disruption and litigation. Different types of premature failures observed during full scale testing of transmission line towers at Tower Testing and Research Station, Structural Engineering Research Centre, Chennai are presented. Failures that have been observed during testing are studied and the reasons discussed in detail. The effect of non-triangulated hip bracing pattern and isolated hip bracings connected to elevation redundant in ‘K’ and ‘X’ braced panels on tower behaviour are studied. The tower members are modeled as beam column and plate elements. Different types of failures are modeled using finite element software and the analytical and the test results are compared with various codal provisions. The general purpose finite element analysis program NE-NASTRAN is used to model the elasto-plastic behaviour of towers. Importance of redundant member design and connection details in over all performance of the tower is discussed.