Steel and Composite Structures

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Modelling aspects of the seismic response of steel concentric braced frames

  • D'Aniello, M. (Department of Structures for Engineering and Architecture, University of Naples "Federico II") ;
  • La Manna Ambrosino, G. (Department of Structures for Engineering and Architecture, University of Naples "Federico II") ;
  • Portioli, F. (Department of Structures for Engineering and Architecture, University of Naples "Federico II") ;
  • Landolfo, R. (Department of Structures for Engineering and Architecture, University of Naples "Federico II")
  • Received : 2012.12.15
  • Accepted : 2013.08.05
  • Published : 2013.11.25
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Abstract

This paper summarises the results of a numerical study on the non linear response of steel concentric braced frames under monotonic and cyclic loads, using force-based finite elements with section fibre discretisation. The first part of the study is addressed to analyse the single brace response. A parametric analysis was carried out and discussed to evaluate the accuracy of the model, examining the influence of the initial camber, the material modelling, the type of force-based element, the number of integration points and the number of fibers. The second part of the paper is concerned with the modelling issues of whole braced structures. The effectiveness of the modelling approach is verified against the nonlinear static and dynamic behaviour of different type of bracing configurations. The model sensitivity to brace-to-brace interaction and the capability of the model to mimic the response of complex bracing systems is analyzed. The influence of different approaches for modelling the inertia, the equivalent viscous damping and the brace hysteretic response on the overall structural response are also investigated. Finally, on the basis of the performed numerical study general modelling recommendations are proposed.

Keywords

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