Evaluating the Behaviour Factor of Medium Ductile SMRF Structures

  • Djamal Yahmi Department of Civil Engineering, University of Hassiba Benbouali of Chlef
  • Taïeb Branci Department of Civil Engineering, University of Hassiba Benbouali of Chlef
  • Abdelhamid Bouchaïr Department of Civil Engineering, Institut Pascal, University of Blaise Pascal of Clermont-Ferrand
  • Eric Fournely Department of Civil Engineering, Institut Pascal, University of Blaise Pascal of Clermont-Ferrand

Abstract

In seismic codes, the capacity of structures is calculated using capacity design procedure based on the concept of base shear. The critical parameter in this procedure is the behaviour factor (q-factor), which allows designing the structures at the ultimate limit state accounting for their ductility and reserve strength. In this paper, the q-factor is evaluated for medium ductile steel moment-resisting frames (SMRF) using pushover analysis. The influence of specific parameters, such as the stories number, the “Column/Beam” capacity and the local response of structural members, is studied. The results show that the most important parameter that affects the q-factor is the local response of first-storey columns, while the “Column/Beam” capacity has a less effect on this factor. Furthermore, it is observed that the q-factor value assigned to the studied frames in Eurocode-8 is systematically underestimated for low-rise frame, while the use of this value for high-rise frame is potentially unsafe.

Keywords: behaviour factor, reserve strength, ductility, steel moment-resisting frames, pushover analysis
Published online
2017-12-11
How to Cite
Yahmi, D., Branci, T., Bouchaïr, A., & Fournely, E. (2018). Evaluating the Behaviour Factor of Medium Ductile SMRF Structures. Periodica Polytechnica Civil Engineering, 62(2), 373-385. https://doi.org/10.3311/PPci.10419
Section
Research Article