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Research Article

Seismic behaviour of re-entrant dominant RC frame buildings

Jahanvi Suthar, Sharadkumar Purohit

Department of Civil Engineering, School of Engineering, Institute of Technology, Nirma University, Ahmedabad-382481, Gujarat, India



Re-entrant corner;

Plan irregularity descriptor;

Torsional response;

Semi-rigid diaphragm

Reinforced Concrete (RC) building stocks with plan and/or vertical irregularities are built routinely world-wide, despite being vulnerable to seismic forces. Irregular RC buildings with asymmetry, mass and stiffness irregularities have been well researched, however, seismic behaviour of RC building with re-entrant corner type plan irregularity is given relatively less attention. In the present study, a total of 104 re-entrant corner dominant plan irregular RC building models (C-, L-, T- and PLUS-shaped) are developed along with one regular rectangular building. Plan Irregularity Descriptors (PIDs) are summarized with their limit of regularity and are evaluated for building models. Building models have uni-directional and bi-directional re-entrant corner of A/L ratio ranging between 0.1 to 0.8 in the X-direction and between 0.2 to 0.8 in the Y-direction. Seismic response quantities; peak displacement, peak storey drift, normalized base shear and normalized overturning moments are evaluated using the equivalent static method and response spectrum method specified by the Indian seismic code. It has been found that building models yield amplified peak displacement responses in the direction perpendicular to that of applied seismic forces. Other seismic response parameters for all re-entrant RC building models fall well within code based permissible limits. A/L ratio limit specified by the Indian seismic code is found to be conservative. Out of various building models considered, C-shaped building models perform well under seismic forces, while PLUS-, L- and T-shaped RC building models with A/L ratio ≥ 0.4, in both directions, overshoot torsional irregularity descriptor, ∆max/∆avg.

© 2022 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.

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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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