الفهرس 
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Abstract
-Introduction: Transmission towers or power towers are elongated constructions with heights that are significantly greater than their widths. In the analysis, they are shown as space steel frames known as self-supporting towers with a separate base for each leg. They are designed to sustain an overhead electrical line. Transmission tower lines are crucial to the structural support system. They are essential for supplying power to various places. These lines should be developed with stability and care to prevent failure during natural disasters. The user and structural designer are accountable for determining the tower’s height, basic configuration, and member and joint details.-Research scope: Prior until now, mathematical programming techniques were utilized to optimize the shape and weight of structures. As design factors for weight optimization, member sectional areas are considered. By combining the challenges of form and weight optimization, the structure’s weight is a highly nonlinear function of the design parameters. Thus, these are the coordinates of the nodes. Consequently, the member lengths (upon which the member sectional areas are based) vary at each repetition stage. Consequently, the increasing number of design variables contributes to the complexity of this optimization strategy.-Research objective: The present work shows the efforts concerning an optimization procedure for the overall weights depending on unusual grouping systems in addition to the most convenient spacing that could be executed within the whole transmission line to serve the process.-Steps study: The analysis and design processes of a self-supporting 400 KV steel power transmission tower considering different parameters is performed. The studied towers are categorized as suspension type and are designed for constant height, common clearances, common span, common conductor, and ground wire specifications. These would be performed in a sequence of implemented procedures relying on conventional design of transmission towers versus the developed investigations progressively. All the used computer programs in FORTRAN and their verifications have high reliability when compared to other programs in this field (SAP 2000).-Conclusions: The results shows that the ultimate load-bearing capacity and failure mode of the tower which is obtained from numerical simulation by SAP2000, are very similar to those of the same run by the FORTRAN program. Besides, increasing the number of groups may lead to more economic cross-sectional design by more than 24% reduction of the overall consumed cost for the most optimized selected spacing (450 m). Hence, , a span of 450 m would be recommended as the most optimized spacing for a transmission line system regarding both serviceability and economic conditions (deflection and overall line weight).