Abstract
Electric power transmission is the second process in the delivery of electricity to consumers. Transmission line towers are used for supporting the extra-high-voltage electric lines. Steel towers are normally used for this purpose. Since transmission line towers are placed about 200–300 m apart, an optimum design of the structure may lead to a great savings in the material cost. In this study, the analysis of a transmission tower was carried out accounting for the soil-structure interaction. The deflection and maximum force in the member were evaluated by carrying out the finite element analysis. The vertical loads such as weight of tower structure, power conductor, ground wire, lineman with tools, insulator strings, and fittings were accounted for in this study. Unbalanced pull due to broken conductor, broken ground wire and load due to temperature variation are the longitudinal forces used in this analysis. Torsional load are due to the breakage of conductors and ground cable. Wind load on members and horizontal component of tension force on conductors and earth wires are considered as transverse force. Three cases such as tower alone, tower plus pile, and tower plus pile plus soil were analyzed using NISA software. The results indicated that the member forces reduce significantly when soil-structure interaction is accounted for in this analysis. Hence, economy can be achieved by considering soil-structure interaction in transmission line towers.
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