Design of Suspension Towers for Transmission Lines
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This thesis is concerned with the design and analysis of suspension towers for transmission lines. Three different portal tower designs are considered; one steel lattice tower, one steel tubular tower and one less conventional made of tubular elements using glass fibre reinforced polymer. A literature study is conducted on tower design, dynamic response of tower structures and composites used in load-bearing structures. The three alternative designs are modelled in PLS-POLE and PLS-TOWER and the 4.5 km long transmission line is modelled in PLS-CADD where the towers are applied climatic loading and analysed. The towers are then optimised and checked by hand-calculations. A life cycle cost analysis on net present value, including a sensitivity analysis, and an environmental life cycle assessment on CO2-emissions are conducted. The three towers are then compared based on material preference and the analysis results. This results in the two tubular towers being the most economical alternatives, while the two steel towers are the most environmentally friendly.