A New Vision for Design of Steel Transmission Line Structures by Reliability Method

Abstract

A reliability design method for statically determinate and indeterminate steel transmission lines towers and poles is presented. The method is in a Load and Resistance Factor Design (LRFD) format. The nominal load and resistance values for design are obtained from the mean values of probability distribution functions describing wind speed, radial ice thickness and yield stress. The load and resistance involving the coefficient of variation of the above variables and a target reliability index. Several cases demonstrate that use of the equations results in steel line having an actual reliability index nearly equal to the target reliability index. Probability of failure calculations by the methods of numerical integration and the design point method are discussed. The mathematical relationship between probability of failure and the reliability index is explained. The analysis and design by computer program, using reliability method gives more safety and