PSI - Issue 70

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ScienceDirect

Procedia Structural Integrity 70 (2025) 137–144

Structural Integrity and Interactions of Materials in Civil Engineering Structures (SIIMCES-2025) Effect of location and types of bracing on the seismic performance

of an unsymmetrical building Maheshwar Bose a, *, Goutam Ghosh a a Civil Engineering Department, MNNIT, Prayagraj-21104, Allahabad, Uttarpradesh, India

Abstract Modern structures often exhibits structural irregularities in mass, stiffness, torsion, vertical from, significantly influencing their seismic performance. Irregular buildings behave distinctly compared to regular shape buildings, and structural irregularities, particularly in plan and elevation, are the key cause of RC building failure during Earthquakes. This research investigates a seismically excited G+5 story building with location Guwahati with various steel bracing configurations, including X-Braced, V braced and Eccentric-braced systems, analysed using ETABs Software. Horizontal irregularities are suited by modelling an L shaped Building. Firstly , Linear Static analysis being carried out for the RC Building with different bracing configurations. Secondly, dynamic analysis Response spectrum method is performed to evaluate the maximum response of the structure to a dynamic load. Finally, the non-linear Time history analysis is performed from three different ground motions. Key parameters evaluated including Base shear, Story displacement, Story drift, Time period and Modal mass participation ratios. It is found that introducing steel bracings into the structural system can significantly increase the shear Capacity of the building. Also, the X Bracing technique improved the performance of the L-shape buildings while unbraced building caused greater displacement, story drift and Reduced Base shear. Although, Time History Analysis provides the most accurate and detailed information about the structural behaviour under dynamic loads, such as the time-varying stresses, strains, displacements and forces. However, it is also the most complex and coextensive method, requiring a lot of data and assumptions. Time history analysis is being used to verify results of other methods such as Static method, Response spectrum method to analyse specific loading conditions. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of International Conference on Structural Integrity Organizers

Keywords: ETABs; Dynamic analysis; Response Spectrum; Time history; Irregularities; Braces; Eccentric.

* Corresponding author Tel.: +91-9023333653 E-mail address: maheshwar.2023st12@mnnit.ac.in

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of International Conference on Structural Integrity Organizers 10.1016/j.prostr.2025.07.036