X-concentrically Braced Frames Designed According to the Second Generation of Eurocode 8

prEN1998-1-2 provides the material-dependent rules in the second generation of Eurocode 8. In this regard, new design rules for low-dissipative (DC1) and dissipative (DC2 and DC3) structures are recommended for the steel structural systems formerly covered by EN1998-1:2005, aiming to improve the seismic performance as well as enhance the ease of use of the codes. In this framework, the rules for X-concentrically braced frames (X-CBFs) have been significantly revised in both moderate (DC2) and high ductility classes (DC3). In order to investigate the effectiveness and the criticisms of the new rules, this paper presents a parametric numerical study on a set of 6-storey structural archetypes equipped with X-CBFs designed according to the prEN1998-1-2:2022, considering different levels of seismic demand as well as different ductility classes (DC1, DC2, and DC3). The seismic response of the designed structures is evaluated through nonlinear static analyses. The results of this study are discussed in terms of design overstrength, steel consumption and capacity curves.