Ontwerptool voor de beoordeling van constructieve alternatieven op duurzaamheid

Introduction Building activities have a great impact on the environment. The bearing structure contributes for around 60% to the environmental costs due to material use in a building and thereby for a large part of the total environmental costs for a building. This impact can be reduced by means of ‘Sustainable Construction’. Problem definition At this moment, a comparison between structural designs are based on the cost and time of construction, the integration of architectural and installation design and the required construction height. Sustainability is not taken into account in this comparison. For the development of ‘Sustainable Construction’, it is necessary to indicate the degree of sustainability of the various structural alternatives for a building. The current tools for measuring the sustainability of buildings, such as GreenCalc+, GPR Gebouw and BREEAM-NL, are very extensive and not suitable to evaluate the sustainability of different constructive alternatives. Research My research focused on the development of a method and design tool for the determination of the degree of sustainability of structural designs. The approach was divided in three phases: 1. Analysis of the problem: study to the present assessment tools and the influence of the bearing structure on the sustainability of a building. 2. The development of the method: Determining the basis for comparison (annual environmental costs) and determining the total environmental costs of a building, based on the structural design, and its estimated service life. The estimated service life is calculated on the basis of the specific building characteristics. 3. Implementing the method into the design tool, written in Java, and testing the tool by determining the sustainability of four structural designs, made for an office. Results 1. A method for determining the sustainability of a building, based on the structural design. Improvements over the current assessment methods: - A more detailed calculation of the environmental costs of a building through a detailed calculation of the material quantities in the bearing structure. - A better approximation of the lifespan of a building. 2. An easy to use design tool to determine the sustainability of structural design variants. Conclusions and recommendations A flexible designed building, ready for future changes in use of the building, can have a long lifespan. For an accurate assessment of sustainability it is therefore required that the life of a building is determined on the basis of the specific building characteristics and not only on its function. The developed method is able to evaluate the flexibility and approximate the lifespan of the building. With the development of the method for evaluating structural designs sustainability, it is now possible to asses structures, that are well thought out, properly. In contrast to the current methods, investment costs in the flexibility of a building can be made visible in the annual environmental costs. This has a positive influence on the ‘Sustainable Construction’. It’s recommended that the calculation of the estimated service life of a building will be further developed and calibrated. Further the aspect of dismountable building has to be integrated in the assessment method.

Subject

duurzaamheid
constructies
levensduur
sustainability

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master thesis

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