The design of RC members with nontraditional methods is demanding due to the large number of unknown variables inherent in the design process. The complexity of the RC beams design optimization problem has led to many oversimplified models, so as current metaheuristic search algorithms can deal with it efficiently. In this paper, the optimization design model of RC beams has been introduced by new design variables, while augmented some; accordingly enhanced the solving algorithm. A new enhanced parameter-setting-free harmony search algorithm has been proposed to solve the model. Furthermore, the tackled optimization objectives were the minimization of cost, weight and cost-weight simultaneously for designing regular or high strength concrete beams.
Steel fibers recovered from recycled tires were considered for use as reinforcement in concrete to improve the tensile properties of concrete as well as being an economically viable and environmentally friendly alternative. This paper investigates the effect of purified and non-purified recycled tire steel fiber in concrete with a constant fiber proportion of 30 kg m−3 to determine properties in fresh and hardened concrete. The results indicate that concrete with purified tire fibers have better tensile properties than those with non-purified tire fibers. Density, strength, and toughness significantly increase but workability tends to decrease when using recycled tire steel fiber as reinforcement in concrete.
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