Razmi, Boshra, Rafiee, Fahime, Baziar, Mohammad Hassan, Saeedi Azizkandi, Alireza. (1404). Evaluation of Structure Frequency on the Dynamic Response of Piled Raft Foundations. هنرهای کاربردی, 13(3), 150-165. doi: 10.22075/jrce.2025.35148.2162
Boshra Razmi; Fahime Rafiee; Mohammad Hassan Baziar; Alireza Saeedi Azizkandi. "Evaluation of Structure Frequency on the Dynamic Response of Piled Raft Foundations". هنرهای کاربردی, 13, 3, 1404, 150-165. doi: 10.22075/jrce.2025.35148.2162
Razmi, Boshra, Rafiee, Fahime, Baziar, Mohammad Hassan, Saeedi Azizkandi, Alireza. (1404). 'Evaluation of Structure Frequency on the Dynamic Response of Piled Raft Foundations', هنرهای کاربردی, 13(3), pp. 150-165. doi: 10.22075/jrce.2025.35148.2162
Razmi, Boshra, Rafiee, Fahime, Baziar, Mohammad Hassan, Saeedi Azizkandi, Alireza. Evaluation of Structure Frequency on the Dynamic Response of Piled Raft Foundations. هنرهای کاربردی, 1404; 13(3): 150-165. doi: 10.22075/jrce.2025.35148.2162

Evaluation of Structure Frequency on the Dynamic Response of Piled Raft Foundations

Journal of Rehabilitation in Civil Engineering
مقاله 21، دوره 13، شماره 3 - شماره پیاپی 39، پاییز 2025، صفحه 150-165    اصل مقاله (1.79 M)
نوع مقاله: Regular Paper
شناسه دیجیتال (DOI): 10.22075/jrce.2025.35148.2162
نویسندگان
Boshra Razmi1؛ Fahime Rafiee* 2؛ Mohammad Hassan Baziar3؛ Alireza Saeedi Azizkandi4
1Master’s Graduted of Geotechnical Engineering, Iran University of Science and Technology (IUST), Narmak, Iran
2Assistant Professor, School of Engineering, Damghan University, Damghan, Iran
3Professor, School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Iran
4Associate Professor, School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Iran
چکیده
This study examines the impact of structural frequency under various input excitations on the dynamic behavior of a piled raft (PR) foundation embedded in a dry sand layer. Numerical modeling using the finite element method was evaluated by experimental results from centrifuge test. The findings reveal that the structure's natural frequency, affected by the dynamic characteristics of both the soil and the foundation, is significantly lower than that of the fixed-base condition. However, the structure's frequency changes are independent of the excitation dominant frequency. Furthermore, as the structure's natural frequency rises, the disparity between the fixed-base condition and the foundation-inclusive scenario becomes increasingly pronounced. These changes significantly affect the whole dynamic system responses, precisely the maximum bending moment along the piles. It highlights the importance of considering the soil-structure interaction in the design process. Additionally, when the frequency of the input excitation closely aligns with the system's natural frequency, it induces the most significant dynamic responses in the soil, pile, raft, and structure. Consequently, relying solely on fixed-based methods in design can lead to unrealistic and potentially unsafe technical decisions.

تازه های تحقیق
  • Abaqus 3D is an effective tool for simulating soil-structure interaction.
  • The system's frequency plays a crucial role in the dynamic response of both the foundation and the structure.
  • Modifying the structural frequency at a constant height significantly impacts the pile moments.
کلیدواژه‌ها
3-D Abaqus simulation؛ Fixed-base condition؛ Piled raft foundation؛ Seismicbehavior؛ System frequency
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