PSI - Issue 70

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ScienceDirect

Procedia Structural Integrity 70 (2025) 255–262

Keywords: Soil Amplification; T shaped Building; Maximum Considered Earthquake (MCE); Time history Analysis; Pushover Analysis; Probability of damage; Seismic Response; Soil amplification; Soil profile. Abstract The seismic vulnerability of reinforced concrete (RC) buildings is greatly affected by soil amplification, which alters the properties of ground motion and significantly influences the seismic response of the structure. Soil amplification is the phenomenon in which soft soil strata increase the intensity of seismic waves relative to bedrock, resulting in stronger ground shaking during an earthquake. While numerous studies have analyzed the seismic behavior of symmetrical reinforced concrete (RC) structures, research is lacking regarding the impact of soil amplification on unsymmetrical buildings. The present study investigates the effect of soil amplification on a 5-storey T-shaped RC frame building. Three different time history data are selected and made compatible with the Maximum considered earthquake (MCE) response spectrum. Literature-based borehole data were used to evaluate the soil amplification effect by analyzing soil stratification, SPT-N values, shear wave velocity, and layer thickness. Pushover analysis has been performed to estimate the Base shear capacity, Roof displacement capacity, and global ductility of the building. A Time history analysis was performed to estimate the seismic response of the building due to the amplified ground motions. Fragility analysis has been performed to estimate the probability of damage to the building for the amplified ground motions. The result shows that the seismic response of the T-shaped RC building has significantly increased due to the soil amplification effect, which further results in increased seismic vulnerability of the building. It indicates that seismic design standards (including the Indian seismic regulations) might require a more explicit consideration of site-specific soil amplification effects on unsymmetrical RC buildings. © 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 Structural Integrity and Interactions of Materials in Civil Engineering Structures (SIIMCES-2025) Evaluation of Soil Amplification Effects on the Seismic Vulnerability of Irregular RC Building Aman Kumar a, *, Shashi Shekhar Singh a , Goutam Ghosh a , L. K. Mishra a a Civil Engineering Department, MNNIT Allahabad, Prayagraj-211004, UP, India.

* Corresponding author. Tel.: +91-8134921754 E-mail address: aman.2020rce03@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.2025.07.051