الفهرس 
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Abstract
This thesis deals with the optimum design of three-dimensional tension structures. The thesis introduces an extensive survey of published work on general concepts, historical and structural types of tension structures. A proposed algorithm that is practically applicable to the optimum design problems of large tension, latticed, and guyed cable structures has been introduced.
The analysis is based on unconstrained minimization of total potential energy of the structure by the conjugate gradient technique. The optimum design is achieved to satisfy the constraints of the design variables using the optimality criteria method. A recurrence relation with relaxation factors for updating the design variables is implemented to obtain faster and more rates of convergence to the optimum design. To show the efficiency of the design algorithm, the proposed algorithm is checked by analysing different solved examples. In addition, a simple and efficient procedure for the analysis and design of guyed towers is proposed. Equivalent beam-column properties are derived for a variety of mast truss panels. The effect of different parameters on the optimum design of different types of guyed towers as three-dimensional structures, considering variable loading conditions, are studied. Further, the stability of guyed towers is investigated in order to determine the factor of safety against buckling through a non-dimensional shear stiffness factor. The results of this study are discussed and summarized.