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Steel and Composite Structures
  Volume 36, Number 3, August10 2020 , pages 273-291
DOI: https://doi.org/10.12989/scs.2020.36.3.273
 


Seismic design rules for ductile Eurocode-compliant two-storey X concentrically braced frames
Silvia Costanzo, Mario D\'Aniello and Raffaele Landolfo

 
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.
 
Key Words
    concentrically braced frames; two-storey CBF, eurocode 8; capacity design; bracings; seismic design
 
Address
Silvia Costanzo, Mario D\'Aniello and Raffaele Landolfo: Department of Structures for Engineering and Architecture, University of Naples
 

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