Evaluating the Seismic Response of an L- Shaped Building with and without X- bracings
ASMI SHIVALIKA VERMA
, Dr. Saleem Akhtar
L-shaped building, X-bracing, seismic effect control, seismic analysis, bending moment, IS 1893-2016 (Part-1) shear force, and ETABS etc.
This dissertation presents a seismic performance evaluation of a G+11 L-shaped reinforced
concrete (RC) building, modeled and analyzed using ETABS software. The structure is assessed
as per the latest Indian Standards—IS 1893 (Part 1): 2016 for seismic loading and IS 875 (Part 1
& 2): 2015 for dead and live loads. The building is assumed to be located in Seismic Zone II and
founded on medium soil, representing a common low-to-moderate seismic condition in India.
The study is carried out in two phases. The first phase involves a comparative analysis between
an Un-braced model and X-braced model to evaluate the overall influence of bracing on seismic
performance. Given that fully bracing an entire structure may not be cost-effective in real-world
scenarios, the second phase focuses on a configurational assessment aimed at achieving optimal
structural performance with economic efficiency. Three X-bracing configurations are examined:
bracing at the edges, at the centre, and a combined edge-centre layout.
To evaluate and compare the seismic behaviour of the models, key structural parameters are
considered: storey drift, storey displacement, storey shear, bending moments, overturning
moment, and base shear. All models are analyzed using Response Spectrum Analysis in
accordance with IS 1893:2016. The inclusion of X-bracing is found to significantly enhance
seismic performance by increasing lateral stiffness and reducing critical response values. Among
the configurations studied, the edge-centre bracing layout offers the best overall
performance, effectively controlling torsional irregularities, minimizing displacement and drift,
and improving force distribution—making it the most structurally efficient and economically
justified option.
The results revealed that the model with Edge-Centre bracing exhibited significantly reduced
storey displacement and drift compared to the other model where bracings are added at centre
and edges, indicating enhanced lateral stiffness and stability. These findings underscore the
importance of incorporating bracing systems in L-shaped buildings to mitigate lateral
movements while considering the implications on internal force distribution.
This study contributes to the understanding of seismic behaviour in irregularly shaped structures
and emphasizes the need for tailored design approaches to optimize performance under seismic
loading. The insights gained are valuable for engineers and architects involved in the design and
retrofitting of buildings in seismic Zone II regions, ensuring safety and resilience in earthquake-
prone areas.The results of the analysis are compared in order to determine the difference in
structural reaction between the two buildings.
Model V, with edge and central bracing, is more stable due to reduced displacement, drift, and
overturning moment. Though slightly costlier, it offers better structural performance and load
distribution under lateral forces. The improved safety and resilience make Model V a more
efficient and reliable design than Model I, II, III and IV.
In conclusion, the study reinforces the importance of both incorporating and optimally
positioning bracing systems in irregular RC buildings. The findings offer practical insights for
engineers to enhance seismic resilience while maintaining cost-effectiveness, ensuring safer
designs in compliance with Indian seismic codes.
"Evaluating the Seismic Response of an L- Shaped Building with and without X- bracings", IJSDR - International Journal of Scientific Development and Research (www.IJSDR.org), ISSN:2455-2631, Vol.10, Issue 9, page no.b482-b490, September-2025, Available :https://ijsdr.org/papers/IJSDR2509159.pdf
Volume 10
Issue 9,
September-2025
Pages : b482-b490
Paper Reg. ID: IJSDR_305049
Published Paper Id: IJSDR2509159
Downloads: 00051
Research Area: Science and Technology
Country: Bhopal, Madhya Pradesh, India
ISSN: 2455-2631 | IMPACT FACTOR: 9.15 Calculated By Google Scholar | ESTD YEAR: 2016
An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 9.15 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator
Publisher: IJSDR(IJ Publication) Janvi Wave
