Congreso celebrado en la Escuela de Arquitectura de la Universidad de Sevilla desde el 24 hasta el 26 de junio de 2015.The work done by Acciona Engineering at the coal yard located in As Pontes, is included within the maintenance plan established by Endesa for the period 2010-2020. This consists of predictive, preventive and corrective actions on the cables of the roof structure, which ultimately will allow extending the useful life of the facilities of the power plant. Several pathologies were detected in numerous cables, and in particular, “cable 15 of arch ner15", suffered an advanced state of degradation with significant loss of its resistant section. This led to recommend its replacement, for which an engineering detail design project was carried out. Therefore, a structural model of the whole arch affected by the pathology was done to allow the analysis of the structural behaviour of the cover during the replacement of the cable. To achieve this goal, the model was performed by implementing a three-dimensional system of nodes and bars processed with GtStrudl structures software