• Rapporto tra duttilità e resistenza di acciai ordinary e acciai ad alta resistenza - Curva tensione-deformazione per alcuni tipi di acciaio ad alta resistenza.

  • Esempi di collegamenti.

HIGH STRENGTH STEEL

The main scope of this research theme is to investigate about the seismic behaviour of Dual-Steel Structures. The idea that is at the base of the so called Dual-Steel Structures is to use Mild Carbon Steel (S235, S275, S355) in dissipative members and High Strength Steel (S460, S690) in non-dissipative members, that are designed to remain elastic during the earthquake and so are characterised by high strength demands. The robustness of the Dual-Steel Structures to severe seismic action is ensured by their global performance, in terms of ductility, stiffness and strength. In particular the “plastic” members will dissipate the seismic energy, acting like structural fuses, while the “elastic” members, provided with adequate overstrength, by higher resistance of material and appropriate size of sections, will have the capacity to carry the supplementary stresses, following the redistribution of forces, after appearance of plastic hinges. This type of structures represent an innovation in seismic design in Europe. Dual-steel structural systems, optimised according to a Performance Based Design philosophy, can be very reliable and cost efficient. Indeed, the use of HSS in building structures has a lot of  other specific advantages in relationship with economic, architectural, environmental and safety needs.The main specific objectives of the research are mainly to find reliable structural typologies and joint/connection detailing for Dual-steel Building Frames and to develop design criteria and Performance Based Design methodology for Dual-Steel structures using HSS. In particular the research group is going to investigate about the evaluation of ovestrength and ductility demand for dissipative members and connections and of q-factors for typical Dual Steel frame typologies. Incremental Dynamic analyses and Performance Based Evaluation will be applied for large series of relevant typologies of frames, in order to evaluate the plastic rotation demand for dissipative members and connections, the overstrength of predominantly elastic members, and the global performances in terms of q factors for DCM and DCH ductility classes.

RESEARCH PROJECT

  • HSS-SERF (High Strength Steel),  RFCS 6th Framework Programme on Research, Technological Development and Demonstration. European Commission, 2005-2008.

RESEARCH GROUP