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Buildings 2017, 7(4), 118; doi:10.3390/buildings7040118

Design Oriented Model for the Assessment of T-Shaped Beam-Column Joints in Reinforced Concrete Frames

1
Department of Structures for Engineering and Architecture, University of Naples “Federico II”, 80125 Napoli, Italy
2
Department of Engineering, Telematic University Pegaso, 80143 Napoli, Italy
*
Author to whom correspondence should be addressed.
Received: 26 October 2017 / Revised: 27 November 2017 / Accepted: 6 December 2017 / Published: 10 December 2017
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Abstract

Beam-column joints represent very important elements of reinforced concrete (RC) structures. In fact, beams and columns, at the boundary, generate internal forces acting on concrete core and on reinforcement bars with a very high gradient. To fully understand the seismic performances and the failure modes of T-shaped beam-column joints (external corner-positioned) in RC structures, a simplified analytical model of joint behaviour is proposed and theoretical simulations have been performed. The model is based on the solution of a system of equilibrium equations of cracked joint portions designed to evaluate internal stresses at different values of column shear forces. The main aim of the proposed model is to identify the strength hierarchy. Limit values of different internal stresses allow us to detect the occurrence of different failure modes (namely the failure of the cracked joint, the bond failure of passing through bars, and the flexural/shear failures of columns or beams) associated with column shear forces; the smaller one represents the capacity of the joint. The present work, focusing on T-shaped joints, could represent a useful tool for designers to quantify the performance of new structures or of existing ones. In fact, such a tool allows us to push an initial undesired failure mode to a more appropriate one to be evaluated. Finally, some experimental results of tests available in literature are reported, analysed, and compared to the predictions of the proposed model (by means of a worked example) and of some international codes. The outcomes confirm that failure modes and corresponding joint capacities require an analytical model, like the proposed one, to be accurately predicted. View Full-Text
Keywords: analytical modelling; beam-column joints; capacity; failure mode; reinforced concrete; T-shaped analytical modelling; beam-column joints; capacity; failure mode; reinforced concrete; T-shaped
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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. Design Oriented Model for the Assessment of T-Shaped Beam-Column Joints in Reinforced Concrete Frames. Buildings 2017, 7, 118.

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