“…In Spain, during the launching of the high-speed viaduct across the river Las Piedras, the designers implemented a stiffening strategy consisting of a triangle-shaped bottom cell, hence increasing the patch loading resistance of the steel girders [1][2][3]. Ripa-Alonso [4] investigated the influence of triangular cell flanges on both critical buckling capacity and resistance of steel plate girders subject to patch loading. Navarro-Manso [5] developed a steel bridge launching system based on a self-supporting double deck, in which the bottom flanges were stiffened with a triangular cell to withstand the concentrated load reactions in the supports.…”