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Stream/Area:
-
Subject:
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Paper ID:
IJSREM65661
Volume:
10 |
6 |
Jun 2026
Pages:
1--
Publication Frequency:
Monthly (12 issues per year)
License:International Journal of Scientific Research in Engineering and Management follows the Creative Commons Attribution 4.0 (CC BY 4.0) License, allowing free use and distribution with proper attribution.
Department of Civil Engineering
Shri Venkateshwara University, Gajraula (UP)
Department of Civil Engineering
Shri Venkateshwara University, Gajraula (UP)
Department of Civil Engineering
Shri Venkateshwara University, Gajraula (UP)
Rapid urbanisation and constrained site geometries frequently force residential high-rise buildings into irregular geometries that significantly influence their seismic and serviceability behaviour. This thesis presents a comprehensive comparative study of the structural response of a G+21 (22-storey) reinforced concrete residential building for a set of common plan and vertical irregularities using STAADPro. The research objective is to quantify the effects of various irregularities — plan asymmetry, setbacks, re-entrant corners, vertical stiffness discontinuities and mass irregularities — on global responses (natural periods, mode shapes, base shear) and local demand parameters (storey drift, lateral displacement, bending moment and shear in beams and columns), and to recommend practical design and mitigation measures. A prototypical regular G+21 building is developed and calibrated; then a series of irregular variants are generated by systematic modifications to plan and elevation. Each model is analysed using static equivalent and modal response spectrum procedures and modal combination, with gravity, wind and seismic loading applied according to relevant code provisions. Results are compared using non-dimensional indices (e.g., percentage change in base shear, peak inter-storey drift ratios, each irregularity type. Key findings show that plan asymmetry and large setbacks markedly increase torsional demand and peak drift in peripheral frames, while vertical stiffness discontinuities concentrate higher bending moments and cause soft-storey mechanisms unless mitigated by strategic shear wall layout or increased diaphragm continuity. Recommendations include configuration-sensitive distribution of vertical resisting elements, minimum diaphragm rigidity practices, and design checks for accidental torsion and P-delta effects for tall irregular residential frames. This study provides actionable guidance for practising engineers designing high-rise residential RCC structures on constrained sites and contributes design charts and comparative data.
KEYWORDS
The present thesis focused on the analysis and study of an irregular reinforced cement concrete (RCC) building using STAAD Pro. The objective of the study was to understand the structural behavior of irregular RCC buildings under different loading conditions and to evaluate their overall performance, stability, and safety. From the complete analytical investigation and detailed study carried out in this thesis, the following major conclusions were obtained: 1. Irregular RCC buildings show complex structural behavior because of non-uniform geometry and unequal stiffness distribution. 2. Structural analysis using STAAD Pro helps in understanding the behavior of beams, columns, slabs, and joints under different loading conditions effectively. 3. The application of dead load, live load, wind load, and seismic load combinations significantly influences the overall performance of the structure. 4. Lateral displacement and storey drift increase with building height due to reduction in stiffness at upper storeys. 5. Wind and earthquake forces produce considerable lateral effects and torsional response in irregular structures. 6. Lower storey columns carry higher axial loads and require greater structural strength compared to upper floors. 7. Beam-column interaction plays a major role in maintaining structural stability and safe load transfer. 8. Proper structural modeling and analysis are essential for achieving safe and economical design of irregular RCC buildings. 9. The use of advanced structural analysis software improves accuracy, reduces manual calculation errors, and helps in efficient structural design. 10. The study confirmed that irregular RCC framed structures can safely resist gravity and lateral loads when properly analyzed and designed according to Indian Standard code provisions. 11. STAAD Pro proved to be an efficient and reliable software for the analysis and design of multi-storey irregular RCC structures. 12. The overall analytical results indicated satisfactory structural stability, serviceability, and safety performance of the building. Therefore, it can be concluded that proper analysis and design of irregular RCC buildings are very important for ensuring structural safety, stability, durability, and economical construction in modern civil engineering practice.
1. Chopra, A. K. (2017). Dynamics of Structures: Theory and Applications to Earthquake Engineering (5th ed.). Pearson Education, New Delhi. 2. Murty, C. V. R., Jain, S. K., and Parikh,D. (2012). Learning Earthquake Design and Construction. Indian Institute of Technology Kanpur, India. 3. IS 456:2000. Plain and Reinforced Concrete – Code of Practice. Bureau of Indian Standards, New Delhi. 4. IS 1893 (Part 1):2016. Criteria for Earthquake Resistant Design of Structures – General Provisions and Buildings. Bureau of Indian Standards, New Delhi. 5. IS 13920:2016. Ductile Detailing of Reinforced Concrete Structures Subjected to Seismic Forces. Bureau of Indian Standards, New Delhi. 6. IS 875 (Part 1):1987. Code of Practice for Design Loads (Other than Earthquake) – Dead Loads. Bureau of Indian Standards, New Delhi. 7. IS 875 (Part 2):1987. Code of Practice for Design Loads – Live Loads. Bureau of Indian Standards, New Delhi. 8. IS 875 (Part 3):2015. Code of Practice for Design Loads – Wind Loads. Bureau of Indian Standards, New Delhi. 9. Das, S., and Paul, D. K. (2014). “Seismic Analysis of Irregular Reinforced Concrete Buildings.” International Journal of Civil and Structural Engineering, 5(1), 32–45. 10. Patel, H., and Shah, V. (2016). “Comparative Study of Regular and Irregular RCC Buildings under Seismic Loading.” International Journal of Engineering Research & Technology (IJERT), 5(4), 456–460.
Publication Date
6/30/2026
Peer Review Type
Double-Blind Peer Review
Review Rounds: 2
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