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• W4317401470 abstract "There has been a rapid development of the nuclear industry on account of climatic change caused by global warming. The most favorable rocky sites for nuclear power plants are exhausted worldwide, and now nuclear facilities are proposed on soil sites. In a soil site, a combined piled raft foundation (CPRF) system can provide the desired level of performance for a nuclear structure under seismic loading conditions. The combined system of the nuclear structure with the CPRF involves complex dynamic interactions between the pile, soil, raft, and the superstructure. In the existing literature, the dynamic behavior of the CPRF system supporting massive and stiff structures is not well studied and investigated. Due to the highly nonlinear dynamic characteristic of the CPRF system supporting massive and stiff reactor buildings, this paper adopts interface nonlinearities (separation and sliding) through the master and slave concept, concrete and reinforcement material nonlinearities through the concrete damage plasticity model for piles and superstructures, and an equivalent linear approach considering soil degradation and damping with Mohr–Coulomb postyielding hardening behavior for the soil. After the successful validation of the modeling approach with the results of the experimental testing, the different aspects of the CPRF of reactor building are investigated, such as amplification, pile and raft behavior, pile–raft coefficient, separation and sliding, contact pressure, nonlinearity in the piles, and the response of the superstructure. This study indicates that the peripheral piles of the CPRF system could prevent the separation of the raft from the soil. The numerical result shows that damage in the CPRF system occurs near the top portion of the pile. The presented procedure to develop the combined model for the seismic analysis in the time domain could help to formulate guidelines for safety-related nuclear structures resting on the CPRF system.Practical ApplicationsSeveral countries are planning and building new nuclear reactors to meet their increasing demand for clean electricity. The most favorable rocky sites to construct nuclear power plants are exhausted worldwide; therefore, some upcoming nuclear reactors are supported on a soil site. The seismic safety of nuclear power plants is paramount because their failure may cause disasters. Hence, the problem of soil–structure interaction becomes vital for nuclear power plants (NPPs) due to the building of nuclear structures under unfavorable ground conditions. The present study describes the methodology to assess piled raft–supported NPP behavior under extreme earthquake events. The presented approach will be helpful to consultants and designers working in the nuclear field. The present study will help to formulate guidelines for the seismic safety of NPPs that rest on soil sites." @default.
• W4317401470 created "2023-01-19" @default.
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• W4317401470 date "2023-04-01" @default.
• W4317401470 modified "2023-10-16" @default.
• W4317401470 title "Nonlinear Dynamic Soil–Foundation–Superstructure Interaction Analysis for a Reactor Building Supported on a Combined Piled–Raft System" @default.
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• W4317401470 doi "https://doi.org/10.1061/ijgnai.gmeng-8096" @default.
• W4317401470 hasPublicationYear "2023" @default.
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