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Seismic design rules for ductile Eurocode-compliant two-storey X concentrically braced frames

  • Costanzo, Silvia (Department of Structures for Engineering and Architecture, University of Naples "Federico II") ;
  • D'Aniello, Mario (Department of Structures for Engineering and Architecture, University of Naples "Federico II") ;
  • Landolfo, Raffaele (Department of Structures for Engineering and Architecture, University of Naples "Federico II")
  • Received : 2020.01.21
  • Accepted : 2020.07.05
  • Published : 2020.08.10
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Abstract

Two-storey X-bracings are currently very popular in European practice, as respect to chevron and simple X bracings, owing to the advantages of reducing the bending demand in the brace-intercepted beams in V and inverted-V configurations and optimizing the design of gusset plate connections. However, rules for two-storey X braced frames are not clearly specified within current version of EN1998-1, thus leading to different interpretations of the code by designers. The research presented in this paper is addressed at investigating the seismic behaviour of two-storey X concentrically braced frames in order to revise the design rules within EN1998-1. Therefore, five different design criteria are discussed, and their effectiveness is investigated. With this aim, a comprehensive numerical parametric study is carried out considering a set of planar frames extracted from a set of structural archetypes that are representative of regular low, medium and high-rise buildings. The obtained results show that the proposed design criteria ensure satisfactory seismic performance.

Keywords

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