COMPARATIVE SEISMIC RESPONSE OF IRREGULAR HIGH-RISE RCC 25 STOREY BUILDINGS WITH AND WITHOUT SHEAR WALLS CONSIDERING P–DELTA EFFECT

Year : 2026 | Volume : 13 | Issue : 02 | Page :
    By

    Jayshri S. Sirsat,

  • Dinesh M. Pandit,

Abstract

The seismic performance of high-rise reinforced concrete (RCC) buildings is significantly affected by plan irregularity, lateral stiffness distribution, and second-order (P–Delta) effects. Irregular structural configurations may generate torsional response and increased deformation demand under seismic excitation while geometric nonlinearity further amplifies displacement and internal forces in tall structures . This study presents a comparative seismic assessment of a G+24 storey RCC building having overall plan dimensions of 30,000 mm × 30,000 mm. Three H-shaped configurations—Straight-Edge H-Shaped Building, H-shaped Building with Chamfered Corners, and H-shaped Building with Re-entrant Corner Configuration are considered to evaluate the influence of plan geometry on structural response. For each configuration, two structural systems are analysed: a bare moment-resisting frame and a shear wall-integrated system. Seismic analysis is carried out using ETABS software through linear static and geometric nonlinear (P–Delta) procedures in accordance with IS 1893:2016 provisions. Key response parameters including storey displacement, storey drift, base shear, and overturning moment are extracted and compared.The results demonstrate that the inclusion of shear walls reduces lateral displacement by approximately 7–12% and storey drift by nearly 9–14%, indicating enhanced stiffness and improved deformation control . However, consideration of P–Delta effects increases roof displacement by about 18–22%, emphasizing the necessity of second-order analysis in high-rise buildings . Among the configurations examined, the Straight-Edge H-Shaped Building exhibits comparatively better displacement control, whereas the H-shaped Building with Re-entrant Corner Configuration shows relatively higher flexibility. Overall, the findings confirm that both plan configuration and shear wall integration play a crucial role in ensuring the seismic safety of irregular high-rise RCC structures.

Keywords: Seismic Analysis, Shear Wall, Plan Irregularity, P-Delta Effect,ETABS

[This article belongs to Journal of Structural Engineering and Management ]

How to cite this article:
Jayshri S. Sirsat, Dinesh M. Pandit. COMPARATIVE SEISMIC RESPONSE OF IRREGULAR HIGH-RISE RCC 25 STOREY BUILDINGS WITH AND WITHOUT SHEAR WALLS CONSIDERING P–DELTA EFFECT. Journal of Structural Engineering and Management. 2026; 13(02):-.
How to cite this URL:
Jayshri S. Sirsat, Dinesh M. Pandit. COMPARATIVE SEISMIC RESPONSE OF IRREGULAR HIGH-RISE RCC 25 STOREY BUILDINGS WITH AND WITHOUT SHEAR WALLS CONSIDERING P–DELTA EFFECT. Journal of Structural Engineering and Management. 2026; 13(02):-. Available from: https://journals.stmjournals.com/josem/article=2026/view=237898


References

Regular Issue Subscription Original Research
Volume 13
Issue 02
Received 27/02/2026
Accepted 06/03/2026
Published 07/03/2026
Publication Time 8 Days
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