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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

Keywords

Abstract






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.

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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.



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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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