Flexural behavior of external beam-column reinforced concrete assemblages externally strengthened with steel cages

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Abstract

In this paper, an experimental study referring to the flexural behavior of full-scale external beam-column joints externally strengthened with steel angles and strips and subjected to cyclic reversal loading is presented. One control specimen and five other specimens having the same characteristics as the control specimen but strengthened with steel angles and strips along beams and columns, and characterized by different configurations of strengthening in the critical regions, were tested. The control specimen was designed with a weak column and strong beam to reproduce the most common cases of old frame structures in the Mediterranean area, which were designed only for gravity loads and are in need of retrofitting to seismic standards. A detailed discussion of the strengthening technique used and of the mechanical properties of the specimens studied under cyclic loading is presented. It is highlighted that, referring to the case of external beam-column assemblages that are not yet extensively studied in the literature, the steel cage is an effective reinforcing technique to increase the flexural and shear strength of beams and columns, also increasing the energy capacity dissipation and reducing the stiffness degradation.
Lingua originaleEnglish
pagine (da-a)883-894
Numero di pagine12
RivistaACI Structural Journal
Volume113
Stato di pubblicazionePublished - 2016

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Reinforced concrete
Steel
Retrofitting
Shear strength
Bending strength
Gravitation
Stiffness
Degradation
Mechanical properties

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction

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title = "Flexural behavior of external beam-column reinforced concrete assemblages externally strengthened with steel cages",
abstract = "In this paper, an experimental study referring to the flexural behavior of full-scale external beam-column joints externally strengthened with steel angles and strips and subjected to cyclic reversal loading is presented. One control specimen and five other specimens having the same characteristics as the control specimen but strengthened with steel angles and strips along beams and columns, and characterized by different configurations of strengthening in the critical regions, were tested. The control specimen was designed with a weak column and strong beam to reproduce the most common cases of old frame structures in the Mediterranean area, which were designed only for gravity loads and are in need of retrofitting to seismic standards. A detailed discussion of the strengthening technique used and of the mechanical properties of the specimens studied under cyclic loading is presented. It is highlighted that, referring to the case of external beam-column assemblages that are not yet extensively studied in the literature, the steel cage is an effective reinforcing technique to increase the flexural and shear strength of beams and columns, also increasing the energy capacity dissipation and reducing the stiffness degradation.",
keywords = "Beam-column assemblage, Building and Construction, Civil and Structural Engineering, Cyclic action, Failure modes, Load-deflection curves, Steel angles, Strips",
author = "Andrea Failla and Giuseppe Campione and Liborio Cavaleri",
year = "2016",
language = "English",
volume = "113",
pages = "883--894",
journal = "ACI Structural Journal",
issn = "0889-3241",
publisher = "American Concrete Institute",

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TY - JOUR

T1 - Flexural behavior of external beam-column reinforced concrete assemblages externally strengthened with steel cages

AU - Failla, Andrea

AU - Campione, Giuseppe

AU - Cavaleri, Liborio

PY - 2016

Y1 - 2016

N2 - In this paper, an experimental study referring to the flexural behavior of full-scale external beam-column joints externally strengthened with steel angles and strips and subjected to cyclic reversal loading is presented. One control specimen and five other specimens having the same characteristics as the control specimen but strengthened with steel angles and strips along beams and columns, and characterized by different configurations of strengthening in the critical regions, were tested. The control specimen was designed with a weak column and strong beam to reproduce the most common cases of old frame structures in the Mediterranean area, which were designed only for gravity loads and are in need of retrofitting to seismic standards. A detailed discussion of the strengthening technique used and of the mechanical properties of the specimens studied under cyclic loading is presented. It is highlighted that, referring to the case of external beam-column assemblages that are not yet extensively studied in the literature, the steel cage is an effective reinforcing technique to increase the flexural and shear strength of beams and columns, also increasing the energy capacity dissipation and reducing the stiffness degradation.

AB - In this paper, an experimental study referring to the flexural behavior of full-scale external beam-column joints externally strengthened with steel angles and strips and subjected to cyclic reversal loading is presented. One control specimen and five other specimens having the same characteristics as the control specimen but strengthened with steel angles and strips along beams and columns, and characterized by different configurations of strengthening in the critical regions, were tested. The control specimen was designed with a weak column and strong beam to reproduce the most common cases of old frame structures in the Mediterranean area, which were designed only for gravity loads and are in need of retrofitting to seismic standards. A detailed discussion of the strengthening technique used and of the mechanical properties of the specimens studied under cyclic loading is presented. It is highlighted that, referring to the case of external beam-column assemblages that are not yet extensively studied in the literature, the steel cage is an effective reinforcing technique to increase the flexural and shear strength of beams and columns, also increasing the energy capacity dissipation and reducing the stiffness degradation.

KW - Beam-column assemblage

KW - Building and Construction

KW - Civil and Structural Engineering

KW - Cyclic action

KW - Failure modes

KW - Load-deflection curves

KW - Steel angles

KW - Strips

UR - http://hdl.handle.net/10447/222474

UR - https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=51689014

M3 - Article

VL - 113

SP - 883

EP - 894

JO - ACI Structural Journal

JF - ACI Structural Journal

SN - 0889-3241

ER -