Optimum design of overhead Transmission line towers

Krishnachar, Jayasimha (1996) Optimum design of overhead Transmission line towers. Phd. Thesis thesis, Karnataka Regional Engineering College, Surthkal.

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Transmission lines serve as connecting link between the source of power and user agencies. The transmission line system consists of towers, conductors, insulatorsand ground wire. The cost of towers is about 40% of the total cost of the transmissionline system. Hence the. economic design of towers has attracted many researchers. The Indian standard I.S.802, "code for use of structural steel in over head Transmission Line Towers" has been modified recently to include probabilistic design and reliability criteria in place of the deterministic method and factors of safetywhere were used earlier. The country has been re-demarcated into six wind zones instead of the three earlier. In view of the changes mentioned above, optimumdesigns for transmission towers become imperative Transmission towers are mostly made of structural angles and are assembledby bolting in situ. The system has very flexible connections resulting in rotation of joints. This causes the structure to respond as pinjointed system, renderingthe members highly effective in carrying axial forces In structural design problems, the objective functions and constraint functions are usually non linear functions of the design variable. As such non linear programming technique are required for structural optimization. The improved move limit method. of sequential linear programming has been used successfullyfor a wide range of structured engineering problems such as trusses, foundations,shells, plates etc. The same technique has been adopted in this study. A FORTRAN-77 analyser has been developed for analysis and design of transmission towers. It handles node generation, computation of loads, analysis and selection of cross sectional areas of members. This analyser is linked to the optimizer

Item Type: Thesis (Phd. Thesis)
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 03 Jan 2015 05:30
Last Modified: 03 Jan 2015 05:30
URI: http://eprints.manipal.edu/id/eprint/141419

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