END CO NDlTiONS Concentric @ Both Ends Normal Framing Eccentricity @ One End 8 Concentric @ Other End Normal Framing Eccenblclty @ Both Ends UnrestrainedAgalnst Rotation @ Both Ends Partially Restrained Against Rotation @ One End 8 Unrestrained @Other Robert Nickerson -Sverdrup Technology TLMRC, Haslet Texas CURVd Ur RANGE EFFECTIVE RATIO (KUr) NO. SLENDERNESS 1 o 5 UR (120 K U r = U r 2 0 5 UR 120 KUr = 30 + 0.75 Ur 3 0 (120 K V r = 6 0 + 0 . 5 U r 4 1 2 0 5 UR (200 K U r = Ur 5 120 5 L/R 5 2 2 5 KUr = 26.6 + 0.762 U I ntrduction Partially Restrained Agains 6 Rotation @ Both EndsTension/compression X-bracing is the most common type of bracing used to resist lateral load in transmission towers. The strength of a compression X-brace member is influenced by many factors including end restraint, end eccentricity, slenderness ratio (U), and the intermediate support offered by the tension member. 120 5 UR 5250 KUr = 46.2 + 0.615

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Lattice towers are the most commonly used medium for transferring electricity in the transmission network across our country. Whereas Tubular Poles are the most commonly used medium for transferring electricity in the transmission network in the developing countries. This project is a comparative study between the conventional lattice tower and the tubular pole for 765kV double circuit medium deviation angle tower with the exception of foundation design. The conventional lattice tower and the tubular pole are modelled and analyzed in STAAD PRO software. The maximum deflections and the weight of the towers are compared and conclusions are drawn in order to determine the advantages and disadvantages of both types of transmission towers.

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