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• W2258272880 abstract "An automated procedure for optimizing the design of precast-prestressed concrete U-beam road bridges is presented. The economic cost and the embodied energy are selected as the objective functions based on production materials, transport and placement. Heuristic optimization is used to search for the best geometry, the concrete type, the prestressing steel, and the reinforcement for the slab and the beam. The results for both objectives provide improved opportunities to learn about low-energy designs. The most influential variables for the energy efficiency goal are analyzed. The relationship between the span length and the embodied energy is described by a good parabolic fit for both optimization criteria. The findings indicate that the objectives do not exhibit conflicting behavior, and also that optimum energy designs are close to the optimum cost designs. The analysis also revealed that a reduction by 1 Euro can save up to 4 kW h. It is recommended to reduce the reinforcement in the slab as well as increase the volume of concrete in both slab and beams in order to achieve higher energy efficiency. It is also worth noting that web inclination angle should be increased when the depth increases for longer span lengths to maintain the optimum slab span lengths in the transverse direction." @default.
• W2258272880 created "2016-06-24" @default.
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• W2258272880 date "2016-05-01" @default.
• W2258272880 modified "2023-10-18" @default.
• W2258272880 title "Structural design of precast-prestressed concrete U-beam road bridges based on embodied energy" @default.
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• W2258272880 doi "https://doi.org/10.1016/j.jclepro.2016.02.024" @default.
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