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Sustainability 2018, 10(2), 401; https://doi.org/10.3390/su10020401

Sustainable RC Beam-Column Connections with Headed Bars: A Formula for Shear Strength Evaluation

1
Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
2
Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LOCIE, 73000 Chambery, France
*
Author to whom correspondence should be addressed.
Received: 28 December 2017 / Revised: 29 January 2018 / Accepted: 29 January 2018 / Published: 4 February 2018
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Abstract

Beam-column joints are critical regions for reinforced concrete (RC) frames subjected to earthquakes. The steel reinforcement is, in general, highly concentrated in these zones. This is why in many cases, headed bars are used. A headed bar is a longitudinal steel reinforcement whose end has a special button added to reduce the bonding length of the steel rebar. This paper establishes a formula predicting the shear strength of exterior RC beam-column connections where the beam longitudinal reinforcements use headed bars. A database was collected, which contained 30 experimental data about the exterior beam-column joints using headed bars and subjected to quasi-static cyclic loading. First, from the collected database, a statistical study was carried out to identify the most influencing parameters on the shear strength of the beam-column joints tested. The three most important parameters were identified and an empirical modified formula was developed based on the formula existing in the standards. The study showed that the results obtained from the modified formula proposed in the present study were closer to the experimental results than that obtained from the formula existing in the standards. Finally, a numerical study was performed on two T-form RC structures and the numerical results were compared with the prediction calculated from the modified formula proposed. For two investigated cases, the proposed formula provided the results in the safety side and the differences with the numerical results were less than 20%. Thus, the proposed formula can be used for a rapid assessment of the shear strength of RC joints using headed bars. View Full-Text
Keywords: RC beam-column joint; headed bars; exterior joints; shear strength RC beam-column joint; headed bars; exterior joints; shear strength
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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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Tran, M.-T.; Bui, Q.-B.; Sentosa, B.; Nguyen, N.-T.; Duong, T.-H.; Plé, O. Sustainable RC Beam-Column Connections with Headed Bars: A Formula for Shear Strength Evaluation. Sustainability 2018, 10, 401.

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