H.R .Ashrafi - Power and Water University of Technology, faculty member
M Jalal - M.Sc. Student, Dept of civil Engg. School of Engg. Razi University, Kermanshah, Iran
K Garmsiri - M.Sc. Student, Dept of mechanical Engg. School of Engg. Razi University, Kermanshah, Iran

In the recent years, many researches have been implemented in the field of composite fibers in concrete. One of the effective and efficient methods of rehabilitation and strengthening of RC members is application of composite materials and FRP jackets and laminates. These laminates are made in different ways with respect to the direction and orientation of fibers forming the layers. Generally 1D, 2D or 3D layers are used for this purpose for which the direction of fibers varies for different types. Selection of the best and optimized irection of fibers is of great importance to fully utilize the strength capacity of composite fibers and the layers. In this paper, genetic algorithm is considered to be used to find the optimized direction of fibers in composite layers. In this way, different angles of fibers in the layer are tested by genetic algorithm to so that the best performance of the composite layers is obtained. It should be considered that by this optimization, lateral resistance of concrete members wrapped by composite layers can be improved.

genetic algorithm, fibers direction, composite fibers, optimization, FRP jackets