Ductility of wide-beam RC frames as lateral resisting system

Fernando Gómez-Martínez, Adolfo Alonso-Durá, Flavia De Luca, Gerardo M. Verderame

Research output: Contribution to journalArticle (Academic Journal)

7 Citations (Scopus)
367 Downloads (Pure)

Abstract

Some Mediterranean seismic codes consider wide-beam reinforced concrete moment resisting frames (WBF) as horizontal load carrying systems that cannot guarantee high ductility performances. Conversely, Eurocode 8 allows High Ductility Class (DCH) design for such structural systems. Code prescriptions related to WBF are systematically investigated. In particular, lesson learnt for previous earthquakes, historical reasons, and experimental and numerical studies underpinning specific prescriptions on wide beams in worldwide seismic codes are discussed. Local and global ductility of WBF are then analytically investigated through (1) a parametric study on chord rotations of wide beams with respect to that of deep beams, and (2) a spectral-based comparison of WBF with conventional reinforced concrete moment resisting frames (i.e. with deep beams). Results show that the set of prescriptions given by modern seismic codes provides sufficient ductility to WBF designed in DCH. In fact, global capacity of WBF relies more on the lateral stiffness of the frames and on the overstrength of columns rather than on the local ductility of wide beams, which is systematically lower with respect to that of deep beams.
Original languageEnglish
Pages (from-to)1545–1569
Number of pages25
JournalBulletin of Earthquake Engineering
Volume14
Issue number6
Early online date4 Mar 2016
DOIs
Publication statusPublished - Jun 2016

Keywords

  • Behaviour factor
  • Chord rotation
  • Deep beams
  • Ductility
  • Effective Period
  • Effective width
  • Seismic codes
  • Wide beams

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