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The journal of RESM is open to proposals for special issues on emerging related topics. More info is here.

Research Article

Bi-diaphragm elastoplastic haunch retrofit solution for ill-detailed RC beam-column joints

Abhay Gujar, Sachin Pore

Department of Civil Engineering, DBATU, Lonere, Maharashtra, India



Ill-detailed joint;

In-fill masonry;





Failure of ill-detailed connections is a primary cause of catastrophic, cascading failure of Reinforced cement concrete (RC) frame subjected to seismic loading. A performance based, 3 dimensional (3D), Bi-Diaphragm bolted metallic haunch retrofit solution is proposed, to avoid brittle shear damage to the connection panel zone. Welding is avoided in fabrication of the proposed device to avoid brittle failure in any part of the assembly. The haunch is designed to alter the strength hierarchy of connection subassembly, ensuring plastic hinge formation in beam before any other type of failure occurs. Assessments reveal that, 3D geometry improves torsional stiffness (+277%) and resilience (+94%) over those of an equivalent planer haunch. Numerical analysis is done to estimate the stiffness of haunch. A flow-chart illustrating procedure to design the proposed haunch is presented. The efficacy of proposed solution is evaluated by performance comparison of a Parking+6 storey frame, with and without retrofit solution, subjected to push-over (+87% rise in lateral load at yield, resilience increased by +37 %) and non-linear seismic analysis (Max. roof displacement reduced by -106% and storey drift by -154%). Masonry walls in habitable floors are modeled as equivalent diagonal struts to replicate much essential soft-storey effect. This study is focused on retrofitting exterior beam-column connections owing to their vulnerability reported in the literature. Analytical and numerical assessments confirm the efficacy of proposed solution in mitigating failure during seismic excitations.

© 2023 MIM Research Group. All rights reserved.


20/04/2024 Collaboration for HSTD-2024Editorial Board of our journal and Organizing Committee of the III. International Conference on High-Speed Transport Development (HSTD) have agreed to collaborate. Extended versions of the selected papers from the conference will be published in our journal. For more see Events.

20/04/2024 Collaboration for DSL2024-SS1Editorial Board of our journal and Organizing Committee of the DSL2024 Fluid Flow, Energy Transfer & Design (SS1) have agreed to collaborate. Extended versions of the selected papers from the session will be published in our journal. For more see Events. .

8/12/2023 Special Issue: Embark on a journey of innovation with the journal of Research on Engineering Structures and Materials as we unveil a compelling opportunity for contributors in our upcoming special issue, "Design, Analysis, and Manufacturing of Composite Vehicle Structures." Led by distinguished Guest Editors Liubov Gavva and Oleg Mitrofanov from Moscow Aviation Institute. For more info see the link.

(More details of the news may be given in the News section)

For more see News...


2023 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.

2023 Best Paper Award:

The paper authored by Ferzan Fidan, Naim Aslan, Mümin Mehmet Koç entitled as “Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications” is awarded.

2023 Most Cited Paper Award:

The paper authored by Ercan Işık, Ehsan Harirchian, Hüseyin Bilgin, Kirti Jadhav entitled as “The effect of material strength and discontinuity in RC structures according to different site-specific design spectra" is awarded.


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