The construction system used requires careful planning. Starting with the architectural design, an accurate study is carried out in order to define the structural elements and then proceeds with a calculation analysis according to the Anti-seismic Regulation in Ministerial Decree 14.01.2008 and C.M. 02.02.2009 n° 617 and other national and international regulations of proven validity.
The structure of the houses is realized with steel extrusions with “C”, “U” and “Z” sections and placed at every 30, 60 cm (in relation to the results of the structural calculations). For the joining of beams, coverings and construction elements, we use angle brackets and custom made pieces to be connected to the structure by means of high strength bolts. The supporting walls that are made of vertical elements in steel are those which take on the function as supporting partition. These walls can be external or internal. The steel elements transfer the weights to the ground through a foundation that is generally made of a reinforced concrete slab; the elements in steel are anchored to the foundation through high strength steel anchors and plates.
Seismic engineering is certainly the area where the construction system of cold-formed steel finds its most interesting applications and where, in particular, its unique mechanical properties in terms of strength, rigidity, and pliancy are expressed in a more effective and efficient manner compared to other construction materials. The houses are designed with anti-seismic criteria, following all the principles of anti-seismic engineering and specific regulations. In addition, the constructive system possesses intrinsic requirements of anti-seismicity such as lightness, a high degree of dissipation, box-like conduct, etc.; it all contributes to making the homes resistant to earthquakes of high intensity.
The construction system of cold-formed steel has better seismic resistance than other materials used for housing construction.
The analysis approach used is of the all-steel type, that is, it has been entrusted to the lateral bracing to concentric contraction elements in St. Andrew’s cross-shaped steel (X-shaped concentric contractions), so that the conduct of both the slabs and the walls were assimilated to that of reticular trusses in steel (all-steel). The presence of the siding of the walls in the OSB3 panels has been completely neglected in the calculation. An approach that is considerably advantageous to statics.
Control of materials
The lifespan of these homes is longer than other systems for the supporting elements are made of galvanized steel and are also protected by the casing making the structural element irreproachable to any weathering agent. In addition, the secondary elements are made of high-quality materials and certified according to strict regulations.
Experimental tests are always carried out on the structures to control the supporting framework, therefore, ensuring the quality of the materials used.