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Yaghfoori, Ali, Mahmoudzadeh Kani, Iradj, Yousefi, Hassan. (1405). Influence of Near-Fault Unidirectional and Bidirectional Ground Motions on DSM-Enhanced Reactor Building Foundations Considering Soil–Structure Interaction: A Case Study. پژوهشنامه مدیریت اجرایی, 2(3), 49-72. doi: 10.22080/ceas.2026.30778.1064
Ali Yaghfoori; Iradj Mahmoudzadeh Kani; Hassan Yousefi. "Influence of Near-Fault Unidirectional and Bidirectional Ground Motions on DSM-Enhanced Reactor Building Foundations Considering Soil–Structure Interaction: A Case Study". پژوهشنامه مدیریت اجرایی, 2, 3, 1405, 49-72. doi: 10.22080/ceas.2026.30778.1064
Yaghfoori, Ali, Mahmoudzadeh Kani, Iradj, Yousefi, Hassan. (1405). 'Influence of Near-Fault Unidirectional and Bidirectional Ground Motions on DSM-Enhanced Reactor Building Foundations Considering Soil–Structure Interaction: A Case Study', پژوهشنامه مدیریت اجرایی, 2(3), pp. 49-72. doi: 10.22080/ceas.2026.30778.1064
Yaghfoori, Ali, Mahmoudzadeh Kani, Iradj, Yousefi, Hassan. Influence of Near-Fault Unidirectional and Bidirectional Ground Motions on DSM-Enhanced Reactor Building Foundations Considering Soil–Structure Interaction: A Case Study. پژوهشنامه مدیریت اجرایی, 1405; 2(3): 49-72. doi: 10.22080/ceas.2026.30778.1064

Influence of Near-Fault Unidirectional and Bidirectional Ground Motions on DSM-Enhanced Reactor Building Foundations Considering Soil–Structure Interaction: A Case Study

Civil Engineering and Applied Solutions
دوره 2، شماره 3، مهر 2026، صفحه 49-72    اصل مقاله (2.36 M)
نوع مقاله: Original Article
شناسه دیجیتال (DOI): 10.22080/ceas.2026.30778.1064
نویسندگان
Ali Yaghfoori؛ Iradj Mahmoudzadeh Kani* ؛ Hassan Yousefi
School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
تاریخ دریافت: 22 آذر 1404،  تاریخ بازنگری: 16 دی 1404،  تاریخ پذیرش: 11 بهمن 1404 
چکیده
This study examines the seismic performance of the APR1400 nuclear reactor, focusing on soil–structure interaction (SSI) and structure–soil–structure interaction (SSSI), particularly on foundations enhanced with block deep soil mixing (DSM). The reactor, including its internal structure, containment building, and DSM layers, was modeled to evaluate its dynamic response to unidirectional and bidirectional near-fault ground motions with different frequency contents. Results indicate that the internal structure experiences higher horizontal accelerations than the containment building, while rocking-induced vertical accelerations are significant in the containment. DSM effectiveness depends on the frequency content of the ground motion, soil properties, and DSM depth. Horizontal accelerations are largely unaffected at high frequencies, but low-frequency responses are notably reduced. In the vertical component, accelerations in the 2–10 Hz range increase by over 140% in the containment building and nearly 60% in the internal structure for an 18-m DSM layer, highlighting the vulnerability of many reactor components. Morlet wavelet analysis shows that DSM reduces horizontal-acceleration energy transmitted to the containment building while shifting it to higher frequencies. In contrast, vertical-acceleration energy is substantially amplified, particularly in the 3–7 Hz range. SSSI effects significantly influence structural response: for modeling a second reactor at a 30-m distance, horizontal energy decreases by approximately 34% in the internal structure, while vertical acceleration energy increases by 3.2 times; at 70-m spacing, vertical energy rises by up to 8 times. Bidirectional near-fault excitations further increase vertical accelerations by 6–46 times compared to unidirectional loading, depending on the structure and earthquake. These findings underscore the critical importance of accounting for multidirectional excitations, DSM-induced effects, and SSSI in the seismic design of nuclear facilities, particularly for sensitive equipment and high-frequency structural responses. Accurate evaluation of these factors is essential to ensure operational safety and prevent potential damage to reactor components under severe near-fault ground motions.
کلیدواژه‌ها
Finite-element modelling؛ Deep soil mixing؛ Multidirectional Loading؛ Rocking motion؛ Nuclear power plant
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