Seismic Response Characterization of Vertically Irregular Multi-Storey Buildings Incorporating Mass and Stiffness Variations Using E-TABS Software

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Year : 2026 | Volume : 16 | 03 | Page :
    By

    Yogini Vijaysing Thakur,

  • Prof. Sandip Baburao Chavan,

  1. M-Tech Student, Department of Civil Engineering, CSMSS Chh. Shahu College of Engineering, Chhatrapati Sambhajinagar, Maharashtra, india
  2. Assistant Professor, Department of Civil Engineering, CSMSS Chh. Shahu College of Engineering, Chhatrapati Sambhajinagar, Maharashtra, India

Abstract

The increasing demand for innovative architectural designs has led to the widespread use of vertically irregular configurations in high-rise reinforced concrete (RC) buildings. However, such irregularities significantly influence structural performance under seismic loading conditions, leading to complex structural behaviour and stress concentration at specific levels This study focuses on evaluating the seismic behaviour of vertically irregular multi-storey buildings using nonlinear time history analysis, which provides a realistic representation of structural response under dynamic loading A G+20 building is considered, and four different models representing geometric irregularity, mass irregularity, stiffness irregularity in RC structure, and stiffness irregularity in composite structure are developed and analyzed. The analysis is performed using real earthquake ground motion data to capture time-dependent variations in response parameters The structural performance is assessed based on storey displacement, storey drift, base shear, and natural time period.The results indicate that vertical irregularities have a significant impact on seismic performance. Among all cases, stiffness irregularity is found to be the most critical, as it leads to concentration of deformation and excessive storey drift at specific levels, indicating the presence of weak storey conditions Mass irregularity increases inertia forces and base shear, while geometric irregularity results in uneven distribution of forces along the height of the structure The composite stiffness model shows improved behaviour with reduced displacement and better load distribution compared to the RCC counterpart.The study concludes that nonlinear time history analysis is an effective method for evaluating the seismic response of irregular structures, as it captures realistic behaviour under earthquake excitation. Proper consideration of vertical irregularities and selection of suitable structural systems are essential for improving the safety and performance of high-rise buildings.

Keywords: Vertical Irregularity, Nonlinear Time History Analysis, Seismic Performance, High-Rise Buildings, Composite Structures

How to cite this article:
Yogini Vijaysing Thakur, Prof. Sandip Baburao Chavan. Seismic Response Characterization of Vertically Irregular Multi-Storey Buildings Incorporating Mass and Stiffness Variations Using E-TABS Software. Recent Trends in Civil Engineering & Technology. 2026; 16(03):-.
How to cite this URL:
Yogini Vijaysing Thakur, Prof. Sandip Baburao Chavan. Seismic Response Characterization of Vertically Irregular Multi-Storey Buildings Incorporating Mass and Stiffness Variations Using E-TABS Software. Recent Trends in Civil Engineering & Technology. 2026; 16(03):-. Available from: https://journals.stmjournals.com/rtcet/article=2026/view=245938


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Ahead of Print Subscription Original Research
Volume 16
03
Received 21/05/2026
Accepted 30/05/2026
Published 04/06/2026
Publication Time 14 Days
15

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