Abstract
Even though methods to estimate system reliability are being studied extensively, the practical inclusion of system reliability at the level of complex structures has not received much attention. In this paper, an attempt has been made to implement the system reliability theories and methods with respect to the transmission line tower using second-order bounding and equivalent linear safety margin approaches. The paper also discusses important issues related to the non-linear force-deformation behaviour of the tower members under buckling failure. The critical safety margins (failable members) are identified by automatic failure mode generation by matrix formulation with the aid of the member replacement technique. A complete computer program has been automated to compute the reliability of transmission towers. Practical towers used to assess the reliability and illustrate the effectiveness of the methods lead to the adaptation of a system-based reliability analysis procedure.
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