IJERT-EMS
IJERT-EMS

Static and Dynamic Analysis of Transmission Line Towers under Seismic Loads


Static and Dynamic Analysis of Transmission Line Towers under Seismic Loads
Authors : Siddu Karthik C S, Sowjanya G V
Publication Date: 05-08-2015

Authors

Author(s):  Siddu Karthik C S, Sowjanya G V

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Volume. 4 - Issue. 08 , August - 2015

e-ISSN:   2278-0181

 DOI:  http://dx.doi.org/10.17577/IJERTV4IS080118

Abstract

Transmission line towers carry heavy electrical transmission conductors at a sufficient and safe height from ground. In addition to their self-weight they have to withstand all forces of nature like a strong wind, earthquake and snow load. Therefore, transmission line towers should be designed considering both structural and electrical requirements for a safe and economical design. This report introduces different types of transmission tower and its configuration as per Indian Standard IS-802. A typical type of transmission line tower carrying 220kV single circuit conductors is modelled and analyzed using SAP2000 considering forces like wind load, dead load of the structure, breaking load of the conductors and earthquake load as per Indian Standard IS1893: 2000 (part 1). Here we have considered optimally designed tower, which has the height of 30m which includes the ground clearance (h1), maximum sag of the lower most conductors wire (h2), vertical spacing between the conductor wires (h3) and vertical distance of earth wire from the uppermost conductor wire (h4). The earth wire or ground wire is always located at the top of the transmission tower. It has a square base width of 4.46m. The type of transmission tower considered here is square based tower having no deviation located on a plain landscape with minimal obstacles. It is located at the wind zone 1 with the basic wind speed of 33m/s. The wind pressure on the tower depends on the gust response factor (GT) which increases with height. Comparison is made between the transmission towers of different type of bracings and situated at different seismic zones such as Zone II. And the tower is analyzed both statically and dynamically. The members are designed for maximum Tension and Compression load for the most critical load combination as per code IS802. The Seismic behaviour of the tower for zone 2 has been tabulated and the deflections, axial forces, modal time period and base shear of both types of towers are noted and compared to know which of these is safe.

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