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

Minh-Tung Tran, Quoc-Bao Bui, Bastian Sentosa, Nhat-Tien Nguyen, Trung-Hieu Duong and Olivier Plé
Additional contact information
Minh-Tung Tran: Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
Quoc-Bao Bui: Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
Bastian Sentosa: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LOCIE, 73000 Chambery, France
Nhat-Tien Nguyen: Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
Trung-Hieu Duong: Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
Olivier Plé: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LOCIE, 73000 Chambery, France

Sustainability, 2018, vol. 10, issue 2, 1-14

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.

Keywords: RC beam-column joint; headed bars; exterior joints; shear strength (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:10:y:2018:i:2:p:401-:d:130177

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