Comparative study of the foundation model of a 220 kV transmission line tower with different footing steps - Finite element analysis

Transmission line Towers are structures commonly used to support the phase conductors and shield wires of a transmission line. The present work describes the analysis of superstructure and substructure of a 220kV transmission line tower. The tower is a self supporting three dimensional type and designed for a height of 33.25 meters which is usual height of supporting conductors to transmit power one point to another in Andhra Pradesh. Super Structure of the transmission line tower has been analysed considering wind loads as per codal provisions IS 802:2002. Reactions obtained from the results in each leg of a transmission line tower at base have been considered as forces for the Finite Element analysis of substructure system. The analysis has been carried out using Ansys Workbench by considering Finite Element Analysis concept with Solid 65 as element for concrete foot steps and truss element for steel sections. Various parameters like deformation & Stresses are observed in the stub angle section and foundation system with five footing steps to study the compare the results between different foot steps of a foundation model. The numerical analysis such as finite element method has enabled the prediction of stresses of foundation of Transmission line Tower.