Environmental impact shares of a reinforced concrete earth-retaining wall with buttresses

http://blog.360gradosenconcreto.com/tipos-muros-contencion-prefabricados-concreto/

Abstract: Structural engineers focus on the reduction of carbon emissions in reinforced concrete structures, while other impacts affecting ecosystems and human health become secondary or are left behind. The featured life cycle assessment shows the impacts corresponding to each construction stage of an earth-retaining wall with buttresses. In this study the contribution ratio of each input flow is analyzed. Accordingly, concrete, landfill, machinery, formwork, steel, and transport are considered. Results show that despite the concrete almost always accounts for the largest contribution to each impact, the impact shares of steel present noticeable sensitivity to the steel-manufacturing route. The parameter of study is the recycling rate, usually 75% reached in Spain. Noticeable variation is found when the recycling content increases. The relationship between the impacts of each material with the amount of material used discloses research interest.

 

Keywords: Life cycle assessment, Functional unit, Steel recycling rate, Concrete ratio, Photochemical oxidation, Ozone depletion, Global warming.

Reference:

MOLINA-MORENO, F.; MARTÍ, J.V.; YEPES, V.; CIROTH, A. (2017). Environmental impact shares of a reinforced concrete earth-retaining wall with buttresses. The Ninth International Structural Engineering and Construction Conference, Resilient Structures and Sustainable Construction ISEC-9, Valencia, Spain July 24-July 29.

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Success factors for integration of sustainable practices at high performance building processes through AHP-based MCDM

Hanging gardens of One Central Park, Sydney. Wikipedia
Hanging gardens of One Central Park, Sydney. Wikipedia

Abstract: Much of the efforts towards low carbon built environment focus on the building energy performance and the relationship between occupant behavior and efficient supply facilities, arguing that impacts are higher during operational stage. However little progression has been The ongoing study aims to provide a simplifed method to decide upon constructive systems for structural slabs based on hierarchical multicriteria weights applied to a set of criteria through a value function: durability, resource depletion, climate impact, investment cost, user comfort and functional design. The main function of slabs as load distribution layers of the structural frame used to be the solely priority of design practice. Other functions of the building as a dynamic system interact within the environment and occupants along time. Currently dealing with sustainable materials and life cycle inventories we aim to provide with a reproducible method for early election of the type of slab by embedding environmental (resource efficiency) and social (durability and performance) criteria among the design criteria. First, we seek for a way to hierarchically distribute the criteria and sub-criteria among the goals against resource depletion and the diverse alternatives. AHP-based MCDM is chosen to build a multi-level hierarchical structure of objectives, criteria, subcriteria, and alternatives. The analysis outlines the expert preferences for factors of buildability and cost premium of implementation of high environmental value of project design. Further analysis will focus on interrelation among factors.

Keywords: 

AHP-based MCDM, value function, environmental impact, construction cost, resource depletion, functionality,   construction systems elicitation.

Reference:

MOLINA-MORENO, F.; YEPES, V. (2015). Success factors for integration of sustainable practices at high performance building processes through AHP-based MCDM. 23rd International Conference on Multiple Criteria Decision Making. 2nd-7th August 2015, Hamburg, Germany, 7 pp.

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Aplicación a la docencia de posgrado en ingeniería: la optimización de distintas tipologías de muros

Gráfica_Fundacion_4Resumen:

Este artículo trata sobre la formación universitaria en ingeniería de proyectos en un curso de postgrado dentro del Máster en Ingeniería del Hormigón de la UPV, centrado en el diseño automatizado de estructuras de hormigón optimizando el coste de ejecución material. El curso considera la mayoría de los algoritmos heurísticos básicos aplicándolos al diseño práctico de estructuras reales, tales como muros, pórticos y marcos de pasos inferiores de carreteras, pórticos de edificación, bóvedas, pilas, estribos y tableros de puentes. Se presentan dos tipos distintos de muros de hormigón armado in situ usados en la construcción de carreteras. Se aplica el algoritmo recocido simulado (SA), en primer lugar a un muro ménsula de 10,00 metros de altura, y en segundo lugar a un muro nervado de la misma altura. El primer modelo consta de 20 variables que definen la geometría estructural así como las características del hormigón y los armados. El segundo modelo necesita 32 variables para su definición. Los parámetros son los mismos para los dos casos. Finalmente, se concluye que la optimización heurística es una buena herramienta para diseñar muros y comparar las distintas tipologías de proyecto, reduciendo los costes.

Palabras clave:

Educación posgrado; Diseño estructural; Optimización; Algoritmos heurísticos; Estructuras de hormigón; Muros.

Referencia:

MARTÍ, J.V.; YEPES, V. (2015). An engineering postgraduate course on heuristic design of different types of retaining walls. 19 th International Congress on Project Management and Engineering, 15-17 July, Granada (Spain).

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