The Structural Engineer > Archive > Volume 67 (1989) > Issues > Issue 22 > Vibration of Transmission Tower Structures
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Vibration of Transmission Tower Structures

A finite element method is applied to the study of natural frequencies of electric transmission line structures. The tower has been modelled as a space truss consisting of 3-dimensional truss elements with three translational degrees of freedom at each node. The sagged conductor cable has been assumed to be composed of straight elements. Extensional characteristics of the cable element are fully considered. A parametric study is conducted to determine the influence of various parameters on the spectrum of natural frequencies of a conductor cable, and appropriate non-dimensional curves are presented. These non-dimensional curves give an insight into the general characteristics of a sagged cable, and can be used to predict inplane natural frequencies over a wide range of sagispan ratios. The first few natural frequencies of the transmission linesystem fall in the range 0.05 to 0.5 Hz. Professor M.L. Gambhir