Eurocode-8-conforming seismic design and behaviour factor of high-post-yield stiffness concentrically-braced steel frames

Mahmoud Hassan*, George Vasdravellis, Dimitrios Vamvatsikos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
32 Downloads (Pure)


A seismic-resistant steel frame with energy-dissipating, chevron-type braces is proposed. The braces are equipped with replaceable hourglass-shaped pins made of duplex stainless steel. Under design seismic loading, energy is dissipated through inelastic deformations confined in the replaceable pins while the other members remain essentially elastic. As a result, the frame exhibits high post-yield stiffness due to the inherent properties of the stainless-steel pins. A Eurocode-8-based design methodology is adopted for the frame and assessed following the Eurocode-8-compatible INNOSEIS approach. Specifically, the overstrength factor is evaluated through nonlinear pushover analysis while the behaviour factor is assessed through incremental dynamic analysis considering high and medium seismicity site-specific ground motion suites. The determined behaviour factor satisfies the global collapse prevention and life safety objectives while also keeping the maximum residual inter-storey drifts below 1/300 to permit an easy substitution of the damaged pins after the design level earthquake.

Original languageEnglish
Pages (from-to)1536-1556
Number of pages21
JournalEarthquake Engineering and Structural Dynamics
Issue number5
Early online date21 Jan 2023
Publication statusPublished - 25 Apr 2023


  • behaviour factor determination
  • energy-dissipative steel brace
  • high-post-yield stiffness braced steel frame
  • replaceable energy-dissipative pins
  • residual drift reduction
  • seismic-resistant braced steel frame

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)


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