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Polymers 2015, 7(9), 1732-1754; doi:10.3390/polym7091479

Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames

1
Department of Structures for Engineering and Architecture, University of Naples Federico II, Via Claudio, 21, 80125 Napoli, Italy
2
Department of Engineering, Telematic University Pegaso, Piazza Trieste e Trento, 48, 80132 Napoli, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 1 August 2015 / Revised: 25 August 2015 / Accepted: 31 August 2015 / Published: 10 September 2015
View Full-Text   |   Download PDF [1885 KB, uploaded 10 September 2015]   |  

Abstract

The beam-column joints are very restricted areas in which the internal forces, generated by boundary elements, act on the concrete core and reinforcing bars with a very high gradient. They are the link between horizontal and vertical structural elements, and therefore, they are directly involved in the transfer of seismic forces. Thus, they are crucial to study the seismic behavior of reinforced concrete (RC) structures. To fully understand the seismic performances and failure modes of beam-column joints in RC buildings, a simplified analytical model of joint behavior is proposed and theoretical simulations are performed. The aim of the model, focusing on internal perimetric joints, is to identify the strength hierarchy in terms of capacity for different failure modes (namely failure of cracked joint, bond failure of passing through bars, flexural/shear failures of columns or beams). It could represent a tool for the designers of new joints to quantify the performance of new structures, but also as a tool for the designers of external strengthening of existing joints in order to calculate the benefits of the retrofit and pushing the initial failure to a more desirable failure mode. Further, some experimental results of tests available in the scientific literature are reported, analyzed and compared. View Full-Text
Keywords: beam-column joints; analytical modeling; capacity; failure mode; FRP; reinforced concrete beam-column joints; analytical modeling; capacity; failure mode; FRP; reinforced concrete
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bossio, A.; Fabbrocino, F.; Lignola, G.P.; Prota, A.; Manfredi, G. Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames. Polymers 2015, 7, 1732-1754.

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