Analyses of Vertical Seismic Responses of Seismically Isolated Nuclear Power Plant Structures Supported by Lead Rubber Bearings

Cho, Sung Gook; Yun, Sung Min; Kim, Dookie; Hoog, Kee Jeung

doi:10.5000/eesk.2015.19.3.133

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The effects of the variability of properties of LRB were evaluated in [5], including the material variability in manufacturing, aging, and the operational temperature effects on the response of a base-isolated NPP structure. Authors in [6] analyzed the vertical seismic response of based-isolated NPP structures using LRBs, comparing the maximum accelerations at the top of the structures and the specific positions between fixed and various LRB models. In [7], the effect of the second hardening of Bouc-Wen model was investigated for LRB on FRS of a base-isolated NPP.…”

Section: Imentioning

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: Imentioning

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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Identifying significant earthquake intensity measures for evaluating seismic damage and fragility of nuclear power plant structures

Nguyen

Thusa

Han

et al. 2020

Nuclear Engineering and Technology

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Optimal Earthquake Intensity Measures for Probabilistic Seismic Demand Models of Base-Isolated Nuclear Power Plant Structures

2021

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The purpose of this study is to evaluate the optimal earthquake intensity measures (IMs) for probabilistic seismic demand models (PSDMs) of the base-isolated nuclear power plant (NPP) structures. The numerical model of NPP structures is developed using a lumped-mass stick model, in which a bilinear model is employed to simulate the force-displacement relations of base isolators. In this study, 20 different IMs are considered and 90 ground motion records are used to perform time-history analyses. The seismic engineering demand parameters (EDPs) are monitored in terms of maximum floor displacement (MFD), the maximum floor acceleration (MFA) of the structures, and maximum isolator displacement (MID). As a result, a set of PSDMs of the base-isolated structure is developed based on three EDPs (i.e., MFD, MFA, and MID) associated with 20 IMs. Four statistical parameters including the coefficient of determination, efficiency (i.e., standard deviation), practicality, and proficiency are then calculated to evaluate optimal IMs for seismic performances of the isolated NPP structures. The results reveal that the optimal IMs for PSDMs with respect to MFD and MID are velocity spectrum intensity, Housner intensity, peak ground velocity, and spectral velocity at the fundamental period. Meanwhile, peak ground acceleration, acceleration spectrum intensity, A95, effective peak acceleration, and sustained maximum acceleration are efficient IMs for PSDMs with respect to MFA of the base-isolated structures. On the other hand, cumulative absolute velocity is not recommended for determining the exceedance of the operating basis earthquake of base-isolated NPP structures.

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Analyses of Vertical Seismic Responses of Seismically Isolated Nuclear Power Plant Structures Supported by Lead Rubber Bearings

Cited by 4 publications

References 5 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

Identifying significant earthquake intensity measures for evaluating seismic damage and fragility of nuclear power plant structures

Optimal Earthquake Intensity Measures for Probabilistic Seismic Demand Models of Base-Isolated Nuclear Power Plant Structures

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