Prediction of the additional shear action on frame members due to infills

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Abstract

Infill masonry walls in framed structures make a significant contribution to theresponse under seismic actions. With special regard to reinforced concrete (RC) structures,it is known that internal forces modifications caused by the frame–infill interaction may benot supported by the surrounding frame because of the additional shear forces arising atthe ends of beams and columns. Such additional forces may lead to the activation of brittlecollapse mechanisms and hence their prediction is basic in capacity assessment, especiallyfor structures that disregard the details for seismic zones. In this paper a parametric study iscarried out addressed to the prediction of the shear forces mentioned before. The results ofthis study can be used as a support when the simplified model is adopted consisting in thesubstitution of infill with an equivalent pin jointed concentric strut, because in this case thestructural analysis fails in the prediction of the shear forces in question. Through the paper, inwhich existing RC infilled frames designed only for vertical loads are discussed, analyticallaws, depending on the level of the axial force arising in a concentric strut equivalent toinfill, are proposed, the above analytical law allowing to correct the local shear forces in theframe critical sections, which are not predictable in the case of substitution of infill with anequivalent concentric strut.
Original languageEnglish
Pages (from-to)1425-1454
Number of pages30
JournalBulletin of Earthquake Engineering
Publication statusPublished - 2015

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All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology
  • Geophysics

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