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.
Lingua originaleEnglish
pagine (da-a)1425-1454
Numero di pagine30
RivistaBulletin of Earthquake Engineering
Stato di pubblicazionePublished - 2015

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Struts
infill
shear
Reinforced concrete
struts
prediction
reinforced concrete
predictions
Concrete construction
concrete structure
masonry
seismic zone
Substitution reactions
Chemical activation
substitution
concrete structures
activation
substitutes

All Science Journal Classification (ASJC) codes

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

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title = "Prediction of the additional shear action on frame members due to infills",
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.",
author = "Liborio Cavaleri and {Di Trapani}, Fabio",
year = "2015",
language = "English",
pages = "1425--1454",
journal = "Bulletin of Earthquake Engineering",
issn = "1570-761X",
publisher = "Springer Netherlands",

}

TY - JOUR

T1 - Prediction of the additional shear action on frame members due to infills

AU - Cavaleri, Liborio

AU - Di Trapani, Fabio

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10447/101293

M3 - Article

SP - 1425

EP - 1454

JO - Bulletin of Earthquake Engineering

JF - Bulletin of Earthquake Engineering

SN - 1570-761X

ER -