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Do not worry about issues in parts of the model not needed for LCA. The classification is likely also going to be used for filtering, so your scope might be off unless the classification is correct.Ħ. This will avoid ambiguities and errors in the use and analysis of the model. Check that the elements are properly classified in terms of IFC Class. If you have a model without reinforcement steel included in concretes, you will need to add back the right ratio of reinforcement by hand when using the model for LCA.ĥ. Structural models can be saved with reinforcements or omitting them for simplicity. Export the model with reinforcement steel included. If hollow objects are represented as solids, call your slabs hollow core slabs.Ĥ. When objects are meant to be hollow, model them as hollows or otherwise indicate that in labeling. If your objects are defined as solid objects and represent for example internal walls, apply labeling such as Internal wall, gypsum + steel studs to indicate it’s a build-up of several layersģ. When you add a multi-layer object, for example, an external wall, apply objects that contain the appropriate materials with relevant thicknesses, including eventual airspaces. Prefer layered elements for multi-material objects. define object material as “Concrete” and object name as “Brick”.Ģ. Metal – Steel S355, Concrete – Insitu Nwt – C20/25), and do avoid contradictory definitions, e.g. Use specific material labels when possible (e.g. Ready-mix concrete or Cast-in-place C30/37 or Steel stairs, but avoid, Airspace, Foreground, White, etc. Verify if the materials are labeled correctly and understandably (using specific technical references is also fine). Apply clear and consistent material labeling. BIM models always contain a large amount of information about your building, however, for your LCA calculation you only need some of this information and defined following these practices.īuilding roof labeled as ‘Soil’ – common and easily rectified misdefinitionĭesign principles for a BIM suitable for LCA automation – in a rough order of priorityġ.
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The main goal is to ensure that your BIM model contains sufficient information for LCA purposes. This guide helps you to design and deliver a BIM model suitable for automating Life-Cycle Assessment. You can read the results of the study here. It is based on this premise, that we created and tested a prototype of a Model Checker for BIM with support from the Finnish ministry of environment’s KIRA-digi program. But very few BIM models are perfect, so to automate the calculations you should first work with your BIM model before importing it. It is a known fact that integrating BIM and Building Life Cycle Assessment is an essential step towards achieving building sustainability on a larger scale. Laura Álvarez, Antón Joaquín Díaz – “Integration of Life Cycle Assessment in a BIM Environment”, 2014 Both LCA and BIM should be integrated in the decision-making process at an early stage with a view to achieving a holistic overview of the project, including environmental criteria, from the beginning. On the other hand, LCA is a suitable method for assessing environmental performance. On the one hand, BIM supports integrated design and improves information management and cooperation between the different stakeholders throughout the different project life-cycle phases.
OPENLCA FOR BUILDING LCA HOW TO
How to make your BIM model work for Life-Cycle Assessment