International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 07 | July 2024
p-ISSN: 2395-0072
www.irjet.net
“Comparing the Behavior of Transmission Line Towers with Different Bracing Configurations through Response Spectrum Analysis” Onkar Rathod #1 Prof. K.S. Bhosale #2 Prof. S.B. Tanawade #3 #1 PG Students, Structural Engineering Department,
NBNSCOE, Solapur
#2 Assistant Professor, Civil Department, SVERI’s College of engineering, Pandharpur #3 Assistant Professor, Civil Engineering Department, NBNSCOE, Solapur
---------------------------------------------------------------------------***--------------------------------------------------------------------------Abstract— As the demand for electricity continues to rise, the cost-effective design of transmission line towers becomes
increasingly important. These towers, which can account for a significant portion of the transmission line's cost, offer opportunities for optimization through exploring different lightweight configurations. This study aims to identify the most economical tower section and configuration adhering to Indian Standard IS-800. The analysis is conducted using SAP2000 software, comparing various bracing patterns and their impact on the tower's progressive collapse behaviour. A standard 220 kV double-circuit transmission line tower will serve as the case study, modelled and analysed within SAP2000. The tower will be having a height of 40 meters and a square base width of 11.5 meters. To facilitate fabrication, the members will be grouped. Steel optimization will be performed to determine the most suitable and cost-effective cross-sections. The Diamond bracing, Double bracing and Knee bracing Transmission tower will be subjected to various loads, including wind, earthquake, and its own dead weight. All analysed towers will be evaluated for both gravity and lateral loads (as per IS: 875(part-III)). The final report has presented a comparative analysis based on factors such as base shear, self-weight, modal time period, modal mass participation, and overall tower weight. Keywords: Transmission Line Tower, Response Spectrum, time history Earthquake Loading, Loading, Wind Loading.
1. INTRODUCTION 1.1 General Introduction The growing need for electricity can be met more efficiently by developing lighter designs for transmission line towers. Choosing the best configuration, along with the right bracing system, height, cross-arm type, and other parameters, plays a crucial role in creating a cost-effective transmission line tower design. Transmission line towers are vital infrastructure, essential for delivering electricity to various regions. This has led to an increase in power station construction and the subsequent expansion of transmission lines from generating stations to areas where electricity is needed. Transmission lines must be stable and meticulously designed to withstand natural disasters. They must also adhere to national and international standards. Planning and designing a transmission line involves meeting several structural and electrical requirements. From an electrical standpoint, the most important factor is insulation and maintaining safe clearances between power-carrying conductors and the ground. The conductor cross-section, spacing between conductors, and ground wire placement relative to conductors will determine the design of towers and foundations. Transmission towers are modelled using various bracing patterns. Axial forces, deflections, and the tower's weight vary depending on the bracing pattern. Specific bracing patterns can help reduce the tower's weight. The main components of a transmission line include conductors, ground wires, insulation, towers, and foundations. Most of the time, transmission lines are designed to withstand wind and ice loads in the transverse direction.
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