Recommended for construction in seismic zones, and to make the best use of space thanks to the compactness of sections with the same required performance, for structure ductility and beam-column node confining. It is suitable for infrastructure, major projects, and just as it is for residential buildings.The NPS® PDTI® transverse expansion stopping column is comprised of metal profiles with circular, square ore rectangular sections, usually filled with concrete. It joins the versatility of a metal structure in the provisional phase with the resistance of a mixed steel-concrete structure in the working phase. It can be supplied with helical or vertical welding, and if requested in a multi-storey version, even with a differentiated section for each interfloor. Metal structure: S275/S355 structural steel sleeve conforming to Standard UNI EN 10219-1. Beyond representing formwork for the casting formwork, it also comprises a hoop system around the central, internal concrete, increasing total resistance.