Seismic response characteristics of base-isolated AP1000 nuclear shield building subjected to beyond-design basis earthquake shaking

Wang, Da Yang; Zhuang, Chu-Li; Zhang, Yong Shan

doi:10.1016/j.net.2017.10.005

Cited by 25 publications

(9 citation statements)

References 16 publications

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“…e main reason is that the stiffness of nuclear island building is less in Y-direction than that in X-direction. Compared with previous studies [16,20], the horizontal displacements calculated in this paper are slightly larger. e main reason is that FSI effect is considered in the models in this paper, but the previous isolation studies do not consider FSI effect.…”

Section: Relative Displacement Responsescontrasting

confidence: 85%

“…e research shows that the base isolation system can effectively ensure the safety of a nuclear island structure under the beyond-design basis earthquake. Wang et al [20] proposed a base isolation design for AP1000 nuclear shield building on considering the performance requirements of the seismic isolation systems and devices of shield building. e research shows that the base isolation technology is an effective approach to maintain the structural integrity which subjected to both DBE (design basis earthquake) and BDBE (beyond-design basis earthquake) shaking.…”

Section: Introductionmentioning

confidence: 99%

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Research on Seismic Response of Base‐Isolated Nuclear Island Building considering FSI Effect of PCS Water Tank

Song

Wei

Zhi

2020

Advances in Civil Engineering

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Base isolation can be used to reduce seismic response of structure and protect the structure from damage subjected to earthquake. To study the isolation effect of new PWR nuclear power plant with a base isolation system, considering FSI (fluid-structure interaction) effect by the simplified model, two 3D numerical models (one nonisolated model and one isolated model) were established. After natural frequency analysis, one artificial ground motion was chosen to analyze isolation effect qualitatively. Based on the results, the accelerations and relative displacements of nuclear island building under ten natural ground motions were statistically analyzed to evaluate the isolation effect quantitatively. The results show that the base isolation system can reduce the natural frequencies of nuclear island building. Horizontal accelerations can be reduced effectively, but the isolation effect is not obvious in vertical direction. The acceleration reduction ratio of the top is about 70%–90%, and the acceleration reduction ratio of the lower part is about 20%–60%. Horizontal displacement of the isolated model is far larger than that of the nonisolated model, and horizontal displacement will become larger considering FSI effect. These conclusions could provide some references for studies on the isolation system of nuclear island building.

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Section: Relative Displacement Responsescontrasting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Research on Seismic Response of Base‐Isolated Nuclear Island Building considering FSI Effect of PCS Water Tank

Song

Wei

Zhi

2020

Advances in Civil Engineering

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“…In order to ensure the correctness of the calculation model, the modal analysis results of CAP1400 nuclear island structure were compared with the results of the relevant existing literature [11,[18][19][20][21][22]. As can be seen from Table 2, the natural vibration frequencies of the first two orders were similar to the results reported in the existing literature.…”

Section: Modal Analysis Of Nuclear Island Structurementioning

confidence: 63%

Nonlinear Seismic Response Characteristics of CAP1400 Nuclear Island Structure on Soft Rock Sites

Chen

2020

Science and Technology of Nuclear Installations

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CAP1400 nuclear island structure is an advanced and novel nuclear power plant structure. In order to explore the seismic response characteristics of CAP1400 nuclear island structure on soft rock sites, a three-dimensional refined nonlinear seismic response analysis model was established for a soft rock foundation-nuclear island structure system using ABAQUS software. The influences of the input ground motion intensity and the frequency spectrum characteristics on the acceleration, relative displacement, and floor response spectrum, as well as the critical shear wave velocity of nonbedrock sites for CAP1400 nuclear island structure, were proposed. The results suggested that the increasing amplitude of the peak acceleration and relative displacement of nuclear island structure decreased as the soft rock site entered a nonlinear state, and the high-frequency components of the input ground motion became more abundant. Specifically, the earthquake response was the largest at the cooling water tank on the top of the shield building, which was the focus of the seismic research on nuclear island structure. Due to the influence of the ground motion frequency spectrum characteristics and the nonbedrock site effect, the peak acceleration, peak relative displacement, and acceleration response spectrum of the nuclear island structure showed different changing trends for the near-field and far-field ground motions. Based on the influence of the site shear wave velocity on the seismic response of nuclear island structure, it was recommended that the critical shear wave velocity of nonbedrock sites for CAP1400 nuclear island structure should be 1250 m/s, and the nuclear island structure-foundation dynamic interaction could be ignored at this time. The research conclusions could provide some technical support and theoretical basis for the construction and seismic performance research of CAP1400 and other nuclear power plants.

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“…For seismic design, as prescribed in Sect. 1.3 of ASCE 43, performance expectations [18] are, namely, (i) less than 1% probability of unacceptable performance against 100% design basis earthquake (DBE) shaking; (ii) less than 10% probability of unacceptable performance against 150% DBE shaking (or beyond design basis earthquake (BDBE)); (iii) seismic demand at the isolated structure calculated at the 80 th percentile for DBE and 90 th percentile for BDBE; (iv) introduction of a physical stop or perimeter damper (at 90% displacement demand at 1.5xDBE input). The adoption of perimeter damper solution, proposed also by Forni et al 2009 [19], will absorb possible loads derived from the impact of isolated nuclear structure with surrounding moat in the case of earthquake magnitude exceeding the assumed design value.…”

Section: Seismic Isolation Performance Objectivesmentioning

confidence: 99%

Benefits of Seismic Isolation for Nuclear Structures Subjected to Severe Earthquake

Frano

2018

Science and Technology of Nuclear Installations

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The Fukushima accident has reiterated that the seismic safety is a clear necessity in the design of nuclear power plants. To overcome the weaknesses of the plant design, appropriate measures or interventions have thus to be put in place to improve the nuclear safety. In this study, seismic isolation, widely adopted for conventional constructions, is considered as retrofit measure to provide superior performance of plant itself, even when exceptional events occur. In this paper, we numerically investigate the dynamic behaviour of a Small Modular Reactor (SMR) plant subjected to 0.6g PGA; in doing that time-history analysis has been performed assuming the reactor building with and without isolators. For that purpose, a suitable FEM model has been implemented to provide in-structure response spectra at safety relevant locations and subsystem supports. Adequate steel and concrete properties as well as isolators properties, experimentally determined, have been assumed. Results have shown the benefits of seismic isolation for NPP that can so sustain levels of loading beyond the design input and demonstrated that failure of an isolation system cannot occur before failure of the isolated structure. However, the large horizontal displacements of the structure require appropriate considerations in the layout and interfaces for interconnected systems.

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Seismic response characteristics of base-isolated AP1000 nuclear shield building subjected to beyond-design basis earthquake shaking

Cited by 25 publications

References 16 publications

Research on Seismic Response of Base‐Isolated Nuclear Island Building considering FSI Effect of PCS Water Tank

Research on Seismic Response of Base‐Isolated Nuclear Island Building considering FSI Effect of PCS Water Tank

Nonlinear Seismic Response Characteristics of CAP1400 Nuclear Island Structure on Soft Rock Sites

Benefits of Seismic Isolation for Nuclear Structures Subjected to Severe Earthquake

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