ESTRUCTURAS ISOSTATICAS E HIPERESTATICAS PDF

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Design of open reinforced concrete abutments road bridges with hybrid stochastic hill climbing algorithms. Ambos algoritmos se aplican a un estribo definido por 40 variables discretas. This article deals with the minimum cost automatic design of reinforced concrete open abutments of road bridges, using a two-hybrid stochastic hill climbing algorithms with a neighborhood move based on the mutation operator from the genetic algorithms.

Both algorithms were applied to an open abutment which has 40 discrete variables. SAMO improves by only 0. Additionally, the paper presents a parametric study of commonly used abutments from 6 to 15 m in height for different bearing conditions. Further, the results presented are of much value for the preliminary design of open abutments of road bridges.

Finally, it is shown that cost savings are mainly located in the footing of these structures. Keywords: Structural design ; Heuristic optimization ; Abutments ; Simulated annealing ; Threshold accepting ; Structural design ; Bridges. Los puentes de carretera constituyen infraestructuras esenciales en el desarrollo de las comunicaciones terrestres. Los estribos sirven de apoyo al tablero y proporcionan soporte al terreno sobre el que descansa la calzada adyacente.

En la Figura 1 se ha representado un esquema de dicho puente. Tabla 2. Figura 1. Esquema del alzado del puente de referencia de dos vanos continuos y 25 m de luz cada vano. La Figura 3 muestra las variables de armado, siendo 12 en el cabezal, 11 en los pilares y 6 en la zapata. Figura 2. Figura 3.

Variables de armado. Secciones del cabezal, pilares y zapata, respectivamente. En la Tabla 3 se muestran las reacciones del tablero del estribo de referencia. La probabilidad de aceptar soluciones peores disminuye con la temperatura. En ocasiones se permite un recalentamiento al final del proceso. Figura 4. Figura 5.

Figura 6. Siguiendo un procedimiento similar al SAMO, el umbral inicial se determina con el procedimiento de Medina Se utiliza como criterio de parada el empleado en SAMO. Asimismo, se permiten reinicios sucesivos con umbrales iniciales decrecientes hasta no encontrar mejoras. Tabla 4. Estribo de referencia E. Estribo optimizado E. Tabla 5. Costes y ahorros entre estribo de referencia y estribo optimizado. Figura 7. Tabla 6. Las recomendaciones 24 indican ratios inferiores a 0,75 para no armar a cortante, lo cual se cumple en la referencia.

El valor medio es igual a 0,67, por debajo de la propuesta 24 para estribos cerrados de 0,70, mientras que para la referencia es de 0, Para el resto de casos, las relaciones oscilan entre 0,00 y 0, En la referencia, se supera ligeramente el valor de 0, ABSTRACT This article deals with the minimum cost automatic design of reinforced concrete open abutments of road bridges, using a two-hybrid stochastic hill climbing algorithms with a neighborhood move based on the mutation operator from the genetic algorithms.

Tabla 1. Unidades de obra y Precios unitarios. Tabla 3. Elemento E. Altura del estribo desde el terreno. Longitud del cabezal. Ancho de la plataforma del tablero. Distancia entre las dos reacciones. Distancia entre las reacciones y el murete de guarda. Altura del apoyo tablero. Ancho murete de guarda. Atura aletas sobre el cabezal. Atura libre de neopreno y meseta inferior de apoyo.

Resguardo vertical de las tierras al cabezal. Longitud de la aleta fuera del cabezal. Espesor de la aleta. Armadura perimetral de zunchado en la zapata. Reacciones horizontales longitudinales suma de las dos. A memetic algorithm approach to designing of precast-prestressed concrete road bridges with steel fiber-reinforcement.

Heuristic optimization of RC bridge piers with rectangular hollow sections. Hassanain, M. Cost optimization of concrete bridge infrastructure. An improved software for design optimization of prestressed concrete beams. Arockiasamy, M. State-of-the-art of integral abutment bridges: design and practice. Calvo, J. Cohn, M. Application of structural optimization.

Blum, C. Hybrid metaheuristics in combinatorial optimization: A survey. Holland, J. Adaptation in Natural and Artificial Systems. Kirkpatrick, S. Optimization by simulated annealing. Krishnanand, K. Glowworm swarm optimisation: a new method for optimising multi-modal functions. Kicinger, R.

Evolutionary computation and structural design: A survey of the state-of-the-art. Orta, B. Balling, R. Optimization of reinforced concrete frames. Perea, C. Design of reinforced concrete bridge frames by heuristic optimization. Carbonell, A. Yepes V. Design of reinforced concrete road vaults by heuristic optimization. Yepes, V. A parametric study of optimum earth-retaining walls by simulated annealing.

CO 2 -optimization design of reinforced concrete retaining walls based on a VNS-threshold acceptance strategy. Cost and CO 2 emission optimization of precast-prestressed concrete U-beam road bridges by a hybrid glowworm swarm algorithm.

A parametric study of optimum tall piers for railway bridge viaducts. Arenas, J. Estribos de puente de tramo recto. Santander: Universidad de Cantabria. Statistical characterization of prestressed concrete road bridge decks. Ministerio de Fomento.

Soke, A. Hybrid genetic algorithm and simulated annealing for two dimensional non-guillotine rectangular packing problems.

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Design of open reinforced concrete abutments road bridges with hybrid stochastic hill climbing algorithms. Ambos algoritmos se aplican a un estribo definido por 40 variables discretas. This article deals with the minimum cost automatic design of reinforced concrete open abutments of road bridges, using a two-hybrid stochastic hill climbing algorithms with a neighborhood move based on the mutation operator from the genetic algorithms. Both algorithms were applied to an open abutment which has 40 discrete variables. SAMO improves by only 0. Additionally, the paper presents a parametric study of commonly used abutments from 6 to 15 m in height for different bearing conditions. Further, the results presented are of much value for the preliminary design of open abutments of road bridges.

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