Published on: June 2026
STRUCTURAL ANALYSIS AND DESIGN OF A 220 KV SINGLE-CIRCUIT TRANSMISSION LINE TOWER USING STAAD.PRO UNDER WIND AND SEISMIC LOADING CONDITIONS
B. Madhavi
Dr. T.Siva Sankar Reddy
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Abstract
The transmission tower plays an essential role in electrical power generation and transmission since it supports the conductor and provides clearances at long spans. As the need for power increases, structural integrity of such towers becomes increasingly critical. The aim of this paper is to carry out analysis and design of a 220 kV self-supporting single-circuit lattice steel transmission tower using the software STAAD.Pro. In order to perform such analysis, wind loads have been determined by referring to IS 875 (Part 3) – Wind zone III (wind speed = 44m/s). This gives us the total horizontal wind load as 130.35 kN. Also, seismic forces have been determined according to IS 1893 – seismic zone II, giving a value of design base shear as 12.43 kN. With an acceptable nodal displacement of 6.20 mm at the tower tip (with the maximum allowable value being 290 mm or H/100), leg members will experience the highest compressive load of 615 kN. The member utilization factor is 0.82, and all other members have lower utilization factors, showing structural adequacy. Modal analysis showed that the first natural frequency is 5.00 Hz (T=0.20 s), meaning the tower is stiff enough without any possibility of resonance during service. It was observed that the wind load controlled the design parameters as compared to the seismic load. The designed tower structure has been proven to meet the requirements of IS 802, IS 875 (Part 3), IS 1893, IS 800, among others.
How to Cite this Paper
Madhavi, B. (2026). Structural Analysis and Design of a 220 kV Single-Circuit Transmission Line Tower Using STAAD.Pro under Wind and Seismic Loading Conditions. International Journal of Creative and Open Research in Engineering and Management, <i>02</i>(6). https://doi.org/10.55041/ijcope.v2i6.128
Madhavi, B.. "Structural Analysis and Design of a 220 kV Single-Circuit Transmission Line Tower Using STAAD.Pro under Wind and Seismic Loading Conditions." International Journal of Creative and Open Research in Engineering and Management, vol. 02, no. 6, 2026, pp. . doi:https://doi.org/10.55041/ijcope.v2i6.128.
Madhavi, B.. "Structural Analysis and Design of a 220 kV Single-Circuit Transmission Line Tower Using STAAD.Pro under Wind and Seismic Loading Conditions." International Journal of Creative and Open Research in Engineering and Management 02, no. 6 (2026). https://doi.org/https://doi.org/10.55041/ijcope.v2i6.128.
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References
[1] Bureau of Indian Standards, IS 802 (Part 1 / Sec 1): Use of Structural Steel in Overhead Transmission Line Towers Code of Practice, Part 1: Materials, Loads and Permissible Stresses, Section 1: Normal and Heavy Loading Conditions, BIS, New Delhi, India.[2] Bureau of Indian Standards, IS 875 (Part 3): Design Loads (Other Than Earthquake) for Buildings and Structures Code of Practice, Part 3: Wind Loads, BIS, New Delhi, India.
[3] Bureau of Indian Standards, IS 1893 (Part 1): Criteria for Earthquake Resistant Design of Structures, Part 1: General Provisions and Buildings, BIS, New Delhi, India.
[4] Bureau of Indian Standards, IS 800: General Construction in Steel Code of Practice, BIS, New Delhi, India.
[5] Bureau of Indian Standards, IS 2062: Hot Rolled Medium and High Tensile Structural Steel — Specification, BIS, New Delhi, India.
[6] Bentley Systems Inc., STAAD.Pro Technical Reference Manual, Version V8i, Bentley Systems, Exton, PA, USA.
[7] S. S. Murthy and A. R. Santhakumar, Transmission Line Structures, Tata McGraw-Hill, New Delhi, India.
[8] N. Prasad Rao, G. M. Samuel Knight, S. J. Mohan, and N. Lakshmanan, "Studies on failure of transmission line towers in testing," Engineering Structures, vol. 33, no. 3, pp. 1040–1048, Mar. 2011.
[9] A. M. Rao and K. Sivasubramanian, "Wind-induced fatigue analysis of transmission tower under extreme wind conditions," Structures, vol. 33, pp. 2180–2191, 2021.
[10] H. B. Jayaraman and W. C. Knudson, "A curved element for the analysis of cable structures," Computers & Structures, vol. 14, no. 3–4, pp. 325–333, 1981.
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