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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، آبان 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 | ||
| تاریخ دریافت: 10 شهریور 1403، تاریخ بازنگری: 18 آذر 1403، تاریخ پذیرش: 17 دی 1403 | ||
| 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 | ||
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| کلیدواژه‌ها | ||
| 3-D Abaqus simulation؛ Fixed-base condition؛ Piled raft foundation؛ Seismicbehavior؛ System frequency | ||
| مراجع | ||
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