Seismic Response Evaluation of NPP Structures Considering Different Numerical Models and Frequency Contents of Earthquakes

Thusa, Bidhek; Nguyen, Duy-Duan; Park, Hyosang; Lee, Tae Hyung

doi:10.7734/coseik.2020.33.1.63

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…Figure 3 shows the based-isolated model and the arrangement of LRBs. More details of the modeling can be found in [14][15][16][17][18][19]. The 1st and 2nd modes of the non-isolated NPP model are the horizontal translation modes of the containment building, while the 3rd and 4th modes represent the translational modes of the auxiliary building, as shown in Figure 5(a).…”

Section: Numerical Modelingmentioning

confidence: 99%

Seismic Responses of NPP Structures Considering the Effects of Lead Rubber Bearing

Nguyen¹,

Nguyen²

2020

Eng. Technol. Appl. Sci. Res.

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Abstract-This study investigates the effects of Lead Rubber Bearings (LRBs) on Floor Response Spectra (FRS) of Nuclear Power Plant (NPP) structures. Three main structures in the Advanced Power Reactor 1400 (APR1400) NPP including the reactor containment building, an internal structure, and an auxiliary building were numerically developed in SAP2000. The structures were modeled using beam stick elements, and lumped masses were assigned to beam element nodes. All equivalent section properties of beam elements were calculated based on the designed cross-sections of the structures. A series of 40 ground motions with response spectra scaled to match the NRC 1.60 spectrum were utilized in numerical time-history analyses. Finally, a thorough comparison of FRS was conducted at different elevations of the structures, considering both with and without LRB. Numerical results showed that the FRS of base-isolated structures at higher elevations was significantly reduced compared to non-isolated structures. However, at lower elevations, the FRS was higher for the base-isolated structures compared to the non-isolated ones. Additionally, at a low-frequency range, roughly smaller than 3 Hz, the FRS of base-isolated structures was always greater than that of the non-isolated ones.

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Section: Numerical Modelingmentioning

confidence: 99%

Seismic Responses of NPP Structures Considering the Effects of Lead Rubber Bearing

Nguyen¹,

Nguyen²

2020

Eng. Technol. Appl. Sci. Res.

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A Short Review on Numerical Modelling Approaches for Seismic Evaluation Performance of Nuclear Power Plant Structures

Phan

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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Nuclear power plant (NPP) structures play a crucial role in protecting the safety of the whole plant. Overall, NPP structures have complex shapes and large dimensions. Therefore, the decision of an appropriate finite element model for seismic response analysis is important. This study presents a brief review of various numerical modelling approaches for seismic evaluation performance of NPP structures. Different conventional models, i.e. lumped-mass stick model (LMSM), full three-dimensional finite element model (3D FEM), elastic solid element model (ESM), and multi-layer shell model (MLSM), which have been applied in modelling nuclear structures, are introduced. Also, the advantages and drawbacks of those models are analysed. Furthermore, a new model namely, beam-truss model (BTM), which is recently proposed, is highlighted. It reveals that LMSM is the most simplified approach for structural modelling of NPP structures. However, it is normally used for linear analyses and not able to simulate the local behaviours and vertical responses of the complex NPP structures. Even though 3D FEM is the most sufficient method for nonlinear seismic response analyses, this approach is very time-consuming and costly computation. MLSM and BTM are recommended as practical and efficient models for nonlinear analyses of NPP structures.

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Seismic Response Evaluation of NPP Structures Considering Different Numerical Models and Frequency Contents of Earthquakes

Cited by 2 publications

References 17 publications

Seismic Responses of NPP Structures Considering the Effects of Lead Rubber Bearing

Seismic Responses of NPP Structures Considering the Effects of Lead Rubber Bearing

A Short Review on Numerical Modelling Approaches for Seismic Evaluation Performance of Nuclear Power Plant Structures

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