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Bulletin of Earthquake Engineering

, Volume 14, Issue 12, pp 3529–3546 | Cite as

Seismic response of masonry-infilled steel frames via multi-scale finite-element analyses

  • Federico Margiacchi
  • Luca Salvatori
  • Maurizio OrlandoEmail author
  • Mario De Stefano
  • Paolo Spinelli
Original Research Paper

Abstract

Effects of masonry infills on the seismic vulnerability of steel frames is studied through multi-scale numerical modelling. First, a micro-modelling approach is utilized to define a homogenized masonry material, calibrated on experimental tests, which is used for modelling the nonlinear response of a one-story, single span, masonry-infilled portal under horizontal loads. Based on results of the micro-model, the constitutive behavior of a diagonal strut macro-element equivalent to the infill panel is calibrated. Then, the diagonal strut is used to model infill panels in the macro-scale analysis of a multi-span multi-story infilled moment-resisting (MR) steel frame. The seismic vulnerability of the MR frame is evaluated through a nonlinear static procedure. Numerical analyses highlight that infills may radically modify the seismic response and the failure mechanism of the frame, hence the importance of the infill correct modelling.

Keywords

Masonry infill Steel frames Multi-scale simulations Equivalent strut Parametric analyses Seismic vulnerability Soft story 

Notes

Acknowledgments

Federico Margiacchi thankfully acknowledges the support and suggestions of Prof. Dr.-Ing. Wolfhard Zhalten and Dr.-Ing. Renato Eusani during his internship at EZI Ingenieurgesellschaft mbH, Solingen, Germany.

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.DICeAUniversity of FlorenceFlorenceItaly
  2. 2.DIDAUniversity of FlorenceFlorenceItaly

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