The aim of this research is to optimise a waffle slab for a reinforced concrete structure of a multifamily residential building. For this modelling, CYPE structural software has been used, as well as its respective economic and environmental database for the subsequent analysis. The optimisation of the floor slab has been achieved through various study alternatives, with the modification of its most characteristic parameters such as the type of concrete used, geometric distances of the various elements that make up the floor slab, as well as the material used for the coffer. All of this gives rise to a series of floor slab alternatives that allow a subsequent economic analysis to be carried out. This shows variations of up to 10% in the cost depending on the features of the floor slab. After this analysis, an environmental comparison of the alternatives is carried out by means of a life cycle analysis (LCA) of the floor slab, for which the results are significant with variations of 37% in kg of CO2 -equivalents emissions from one alternative to another. Through this research, it is possible to establish which parameters are the most important and have the greatest relevance when designing a floor slab. All of this, taking into account their economic and environmental impacts.
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