The first electric power station in Greece is a registered monument of the international\nindustrial heritage. The building consists of three longitudinal parts with a total area of\n4800 m2 approximately in plan and has two levels of a height of 3 m and 12 m respectively.\nThe structural system consists mainly of stone masonry walls and a steel roof. Nowadays\nthe building is scheduled to be reused as a Museum of Electric Power and the need for\nstructural upgrade arose mainly from current seismic requirements. According to the\nstructural assessment study, the prevailing problem of the building is the combination of\nthe presence of very high walls, interrupted by transverse walls at a distance of approximately\n80 m, and the complete lack of horizontal diaphragms. The building�s architectural,\nhistoric and technological value is significant and its preservation, by minimization of\ninterventions, posed several problems to the retrofit design. New steel frames connected\nto and cooperating with the masonry walls were designed to bear the vertical roof loads\nand restore the horizontal diaphragm at the roof level, while also reducing the seismic\nactions at the walls. The total required strength was achieved by additionally implementing\nvertical post-tensioning bars and FRP strips.
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