The Influence of Soil Flexibility on Structural Seismic Behavior

Sonia Outayeb; Samia Louadj; Amar Louzai

doi:10.55549/epstem.1754423

The Influence of Soil Flexibility on Structural Seismic Behavior

Abstract

The dynamic behavior of buildings during earthquakes is deeply influenced by the interaction between the structure and the supporting soil. This work investigates the influence of soil-structure interaction (SSI) on the seismic behavior of 3-, 6-, and 9-story reinforced concrete moment-resisting frames designed in accordance with the Algerian seismic code RPA99 (Version 2003). The numerical analyses are carried out using the FLAC2D software, where the soil is modeled as a homogeneous profile with elastic perfectly plastic behavior, and the structural components remain within the linear elastic domain. Two scenarios are compared: a fixed-base model and a flexible-base model that accounts for SSI effects. The frames are subjected to three recorded ground motions. The comparison is made in terms of spectral acceleration, top lateral displacements, and base shear. The results indicate that SSI modifies the dynamic response of structures and can induce resonance effects that amplify structural response, highlighting the necessity of considering these phenomena in seismic design.

Keywords

References

Outayeb, S., Louadj, S., & Louzai, A. (2025). The influence of soil flexibility on structural seismic behavior. The Eurasia Proceedings of Science, Technology, Engineering and Mathematics (EPSTEM), 34, 244-252.

Details

Primary Language

English

Subjects

Classical Physics (Other)

Journal Section

Conference Paper

Authors

Sonia Outayeb This is me
Algeria

Samia Louadj This is me
Algeria

Amar Louzai This is me
Algeria

Early Pub Date

August 1, 2025

Publication Date

August 1, 2025

Submission Date

February 27, 2025

Acceptance Date

April 3, 2025

Published in Issue

Year 2025 Volume: 34

DOI

https://doi.org/10.55549/epstem.1754423

IZ

https://izlik.org/JA73BA26PR

Cite

RIS / Bibtex

APA

Outayeb, S., Louadj, S., & Louzai, A. (2025). The Influence of Soil Flexibility on Structural Seismic Behavior. The Eurasia Proceedings of Science Technology Engineering and Mathematics, 34, 244-252. https://doi.org/10.55549/epstem.1754423