Abstract
Early damage to beam‒column joints during an earthquake can cause rapid degradation of structural seismic performance or even collapse of buildings. Installing reinforced concrete (RC) wing walls to one side of the columns of an existing RC frame structure, i.e., enlarging the column cross section, can not only improve the strength of the columns but also strengthen the beam–column joints. Quasistatic cyclic loading tests were conducted to validate the strengthening effectiveness for interior beam‒column joints by wing wall installation methods, and the strengthening mechanism was analyzed. Through theoretical analysis, a mechanical model and a simplified design method for strengthening interior beam-column joints using wing walls were proposed. The method focuses specifically on the contribution of the compressive wing wall to the joint strengthening effect. The test results revealed that for the non-strengthened benchmark specimen, damage was concentrated at the joint region. The strength of the strengthened specimen was largely improved, and an ideal beam-yielding mechanism was formed. A mechanical model and design theory for strengthening interior beam‒column joints was proposed, with which the maximum strengths and failure modes of the specimens with/without strengthening were evaluated. This study reveals that seismically deficient interior beam-column joints, which are subjected to shear forces up to twice those of exterior joints during seismic events, can be effectively strengthened using a wing wall installation method. A novel, simplified design approach is proposed for this strengthening technique, offering improved practicality and efficiency compared to existing methods.
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Data availability
The data sets generated during the current study are available from the corresponding author on reasonable request.
References
Aykanat, B. et al. Field investigation on reinforced concrete and masonry buildings damages after November 23, 2022 Gölyaka (Düzce) earthquake. J. Earthq. Tsunami. 17 (4), 2350010 (2023).
Qu, Z. et al. Rapid report of seismic damage to buildings in the 2022 M6.8 Luding earthquake, China. Earthq. Res. Adv. 3 (1), 100180 (2022).
Architectural Institute of Japan (AIJ). Reconnaissance report on the 2015 Nepal Gorkha earthquake. (2016).
Sanada, Y. et al. Preliminary Report on Damage to Buildings due to the September 2 and 30, 2009 Earthquakes in Indonesia, Proceedings of the Eleventh Taiwan-Korea-Japan Joint Seminar on Earthquake Engineering for Building Structures, Kyoto, Japan. (2009).
Chu-Chieh, J. & Lin Juin-Fu Chai. Reconnaissance report on the China Wenchuan earthquake. NCREE Newsl. 3(3). (2008).
Cheng Shaoge. Reflections on some problems of reinforcement and retrofitting of large public buildings. Building Struct. 51 (17), 91–97 (2021).
Guo, X. Characteristics and mechanism analysis of the great Wenchuan earthquake. J. Earthq. Eng. Eng. Vib. 29 (6), 74–87 (2009).
GB 50011 – 2010. Beijing: China Architecture and Building, (2010).
Wang & Yayong Huang Wei. Wenchuan Earthquake Building Damage Revelations (Earthquake, 2009).
Lieping, Y. et al. Study on ensuring the strong column-weak beam mechanism for RC frames based on the damage analysis in the Wenchuan earthquake. Building Struct. 38 (11), 52–59 (2008).
Binbin Gong and Hao Li. A couple Voronoi-RBSM modeling strategy for RC structures. Struct. Eng. Mech. 91 (3), 239–250 (2024).
Liuhua Yang, Y. et al. Three-dimensional concrete printing technology from a rheology perspective: a review. Adv. Cem. Res. 36 (12), 567–586 (2024).
Li, K. et al. A comprehensive benefit evaluation of recycled carbon fiber reinforced cement mortar based on combined weighting. Constr. Build. Mater. 489, 142196 (2025).
Zhipeng Zhai, Q. et al. CCQC-based multi-seismic level optimum design of supplemental dampers in steel moment resisting frame. J. Building Eng. 108, 112922 (2025).
Xu, L. et al. Numerical predictions of progressive collapse in reinforced concrete beam-column sub-assemblages: A focus on 3D multiscale modeling. Eng. Struct. 315, 118485 (2024).
Huang, H., Yao, Y., Liang, C. & Ye, Y. Experimental study on Cyclic performance of steel-hollow core partially encased composite spliced frame beam. Soil Dyn. Earthq. Eng. 163, 107499 (2022).
Zhang, W. et al. Reliability-based analysis of the flexural strength of concrete beams reinforced with hybrid BFRP and steel rebars. Archives Civil Mech. Eng. 22, 171 (2022).
Ghasemi, M., Zhang, C., Khorshidi, H., Zhu, L. & Hsiao, P. C. Seismic upgrading of existing RC frames with displacement-restraint cable bracing. Eng. Struct. 282, 115764 (2023).
Zhang, W., Yang, X., Lin, J., Lin, B. & Huang, Y. Experimental and numerical study on the torsional behavior of rectangular Hollow reinforced concrete columns strengthened by CFRP. Structures 70, 107690 (2024).
Huang, H., Guo, M., Zhang, W., Min, M. A. S. C. E. & Huang Seismic behavior of strengthened RC columns under combined loadings. J. Bridge Eng., 27 (6). (2022).
Ministry of Housing and Urban⁃Rural & Development PRC. Technical specification for seismic strengthening of building JGJ 116–2009.
Ministry of Housing and Urban⁃Rural. Development, Code for design of concrete structures: GB 50010 – 2010. (2010).
Wardi, S., Sanada, Y., Kita, M., Tanjung, J. & Maidiawati Investigation on implementation of seismic detailing of reinforced concrete buildings in West Sumatra Indonesia. Proceedings of the 7th Asia Conference on Earthquake Engineering (7ACEE). Bangkok, Thailand; : Paper ID ACEE0069. (2018).
Xue Yantao, H. et al. Seismic damage and design concept from the Building of RC frame structure in Wenchuan earthquake. Earthq. Resistant Eng. Retrofitting. 31 (5), 93–100 (2009).
Gencoglu, M. & Mobasher, B. The strengthening of the deficient RC exterior beam-column joints using CFRP for seismic excitation. Proceedings of the 3 rd international conference on structural engineering, mechanics and computation. : 10–12 (2007).
Genesio, G. Seismic Assessment of RC Exterior beam-column Joints and Retrofit with Haunches Using post-installed Anchors (University of Stuttgart, 2012).
Rajendran, M. Novel ductile enhancement in the structural characteristics of external beam column joint with Potassium-Activated green concrete technology. J. Earthq. Tsunami. 16 (1), 2250005 (2022).
Shafaei, J. & Adibi, M. Seismic performance evaluation of retrofitted RC beam-column joints reinforced by plain and deformed bars. Eur. J. Environ. Civil Eng. 26 (12), 5948–5970 (2022).
Shafaei, J. Non-linear macro modelling of Cyclic response of non-seismically detailed reinforced-concrete connections. Magazine Concrete Res. 73 (2), 80–97 (2021).
Hashemi, S. A., Nezami, S. A. & Shafaei, J. Experimental Cyclic assessment of corner RC beam-column connections under in-plane lateral Cyclic loading: comparison with exterior connections. Structures 79, 109685 (2025).
Shafaei, J., Hosseini, A., Marefat, M. S. & Ingham, J. Rehabilitation of earthquake damaged external RC beam-column joints. Proceedings of the 2014 New Zealand Society for Earthquake Engineering (NZSEE) Conference, Auckland, New Zealand. (2014).
Hosseini, A., Marefat, M., Arzeytoon, A. & Shafaei, J. Analytical investigation of seismic performance of exterior RC beam-column joints rehabilitated with new scheme. Proceedings of the 15th World Conference on Earthquake Engineering (15WCEE), Lisbon, Portugal. (2012).
Li, Y. B. & Sanada, Y. Seismic strengthening of existing RC Beam-Column joints by wing walls. Earthq. Eng. Sructural Dynamics. 46 (12), 198 (2017).
Sashima, Y., Nitta, Y., Tomonaga, T., Sanada, Y. & Seismic Loading Test on an R/C Exterior Beam–Column Joint without Shear Reinforcements in Indonesia. Proceedings of the Thirteenth Taiwan–Japan–Korea Joint Seminar on Earthquake Engineering for Building Structures, Seoul, Korea, 68–77. (2011).
Sanada, Y., Tomonaga, T., Li, Y. & Watanabe, Y. Behavior of an R/C exterior Beam–Column joint without concrete confnement under seismic loading. Proc. Seventh Int. Conf. Concrete Under Severe Conditions–Environment Load. 2, 1598–1606 (2013).
American Concrete Institute. Seismic Assessment and Retrofitting of Existing Concrete Buildings (ACI 369.1–22) (American Concrete Institute, 2023).
ACI Committee 318. Building Code Requirements for Structural Concrete (ACI 318 – 19), 2019).
European Committee for Standardization (CEN). EN 1992-1-1: Eurocode 2: Design of Concrete structures - Part 1–1: General Rules and Rules for Buildings (CEN, 2004).
American Society of Civil Engineers. Seismic Evaluation and Retrofit of Existing Buildings (ASCE/SEI 41 – 17) (American Society of Civil Engineers, 2017).
Ministry of Housing and Urban⁃Rural. Development, RPC. Specification for seismic test of building JGJ/T101, (2015).
The Japan Building Disaster Prevention Association (JBDPA). English Version, 1st, Standard for Seismic Evaluation of Existing Reinforced Concrete Buildings, Guidelines for Seismic Retrofit of Existing Reinforced Concrete Buildings, 2001, and Technical Manual for Seismic Evaluation and Seismic (Retrofit of Existing Reinforced Concrete Buildings, 2001).
Shiohara, H. Reinforced concrete beam-column joints: an overlooked failure mechanism. ACI Struct. J. 109 (1), 65–74 (2012).
Shiohara, H. & Kusuhara, F. The Next Generation Seismic Design for Reinforced Concrete Beam-column Joints. Proceedings of the Tenth U.S. National Conference on Earthquake Engineering, Anchorage, AK, https://doi.org/10.4231/D3T727G8S (2014).
Acknowledgements
This research was supported by the International Science and Technology Cooperation Program of Scientific and Technological Developing Scheme of Jilin Province (Grant No. 20240402049GH).
Funding
This research was supported by the International Science and Technology Cooperation Program of Scientific and Technological Developing Scheme of Jilin Province, with the Grant No. 20240402049GH.
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All authors contributed to the study. Conception and design were performed by LI Yuebing and XING Shuang. Material preparation, data collection and analysis were performed by YAN Qi, WANG Hang, and HAN Xitian. The first draft of the manuscript was written by YAN Qi and LI Yuebing. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Yuebing, L., Qi, Y., Hang, W. et al. Experimental study on strengthening interior beam column joints in reinforced concrete structures using wing walls. Sci Rep (2025). https://doi.org/10.1038/s41598-025-34376-7
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DOI: https://doi.org/10.1038/s41598-025-34376-7
