Potentiality of Using Vertical and Three-Dimensional Isolation Systems in Nuclear Structures

Zhou, Zhiguang; Wong, Jenna; Mahin, Stephen A.

doi:10.1016/j.net.2016.03.005

Cited by 60 publications

(26 citation statements)

References 4 publications

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“…e effects of the vertical component of earthquake acceleration on a structure had received relatively less attention in the past. Zhou et al [6] studied several vertical and 3D isolation systems on the modern nuclear facilities. eir study consisted of a series of case study analysis of the modern nuclear power plant model to examine the benefits and challenges associated with 3D isolation, compared to that of the horizontal isolation.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance Evaluation of Double‐Skin Semi‐Base‐Isolated Building Using Incremental Dynamic Analysis

Parsaeimaram

Fang

Luo

et al. 2018

Advances in Civil Engineering

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Base isolation is a widely accepted earthquake damage prevention technique. is method decouples the superstructure from the base by putting a flexible layer under each column, thereby elongating the time period of structures. Semi-base isolation (SBI) in double-skin structures is an effective technique to reduce the dynamic responses of structures due to earthquake motions, by utilizing the isolation devices in part of it instead of the entire base. is study presents a double-skin structure consisting of outer fixed base frames with shear walls that have been detached from the inner core with a minor gap. e inner core of the structure has been dissociated from the base using the elastomeric bearings. Seismic response of 10-story double-skin structure with inner isolated core was compared to that of inner fixed base core to consider the yielding and collapse probability of the structure using the incremental dynamic analyses (IDA). e results showed that the time period in SBI buildings can be adjusted with the use of coupling beams between the inner and outer frames. Also, the time period and interstory drift ratio are both reduced as more floors are given coupling beams. However, these coupling beams are the most effective at the topmost floors.

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Section: Introductionmentioning

confidence: 99%

Seismic Performance Evaluation of Double‐Skin Semi‐Base‐Isolated Building Using Incremental Dynamic Analysis

Parsaeimaram

Fang

Luo

et al. 2018

Advances in Civil Engineering

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“…22 • Nonlinear 3D finite element analyses are different from traditional elastic simplified methods used in the nuclear power industry. Similarly, there are trade-offs in the selection design parameters for a particular type of isolation system.…”

Section: New Concerns In the Planning Design And Construction Promentioning

confidence: 99%

“…Therefore, how to reduce the vertical seismic response of the isolated NPPs and the impact of 3D seismic action on design of isolated NPPS need to be carefully studied. 22 • Nonlinear 3D finite element analyses are different from traditional elastic simplified methods used in the nuclear power industry. Expertise in this area is not generally available across all segments of the industry.…”

Section: New Concerns In the Planning Design And Construction Promentioning

confidence: 99%

Evaluation and research needs for seismically isolating nuclear power plants

Zhou

Wong

et al. 2019

Energy Science & Engineering

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The main focus of this paper was to examine some of the principal advantages and disadvantages cited for the application of seismic isolation to nuclear power facilities. This discussion is followed by an examination of the potential relative impacts on cost and schedule of a conventional fixed‐base design approach vs one based on seismic isolation. This examination considers issues associated with planning, design, operation, and decommission. Some of the challenges related to design and maintenance (during normal operations and following a significant earthquake) are then discussed, and specific research and development topics are identified that are necessary to allow seismic isolation to be pursued with confidence. Finally, overall conclusions and recommendations are offered.

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“…For example, in the 2011 Tohoku-Oki earthquake, the base-isolated emergency building in the Fukushima Daiichi plant performed well (JNSE, 2013), spurring more research on protective systems for NPP. Several studies (Huang et al, 2007, Huang et al, 2013, Kumar et al, 2015, 2017, Zhou et al, 2016 have investigated the effectiveness of base isolation in NPP. The focus of these studies has predominantly been on horizontal isolation.…”

Section: Introductionmentioning

confidence: 99%

Evaluating adaptive vertical seismic isolation for equipment in nuclear power plants

Najafijozani

Becker

Konstantinidis

2020

Nuclear Engineering and Design

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Seismic isolation systems are widely recognized as beneficial for protecting both acceleration-and displacement-sensitive nonstructural systems and components. So-called adaptive isolation systems exhibit nonlinear characteristics that enable engineers to achieve various performance goals at different hazard levels. These systems have been implemented to control the horizontal response, but there has been limited research on seismic isolation for controlling the vertical response. Thus, this paper seeks to evaluate the benefit of adaptive vertical isolation systems for components, specifically in nuclear power plants (NPP). To do this, three vertical isolation systems are designed to achieve multiple goals: a linear spring and a linear damper (LSLD), a linear spring and a nonlinear damper (LSND) and a nonlinear spring and a linear damper (NSLD). To investigate the effectiveness of the systems, a stiff piece of equipment is considered at an elevated floor within a NPP. A set of 30 triaxial ground motions is used to investigate the seismic performance of the equipment. The maximum isolation displacement and equipment acceleration are used to assess the effectiveness of the three isolation systems. While all systems significantly reduce the seismic accelerations on the equipment, the relatively simple LSLD and LSND systems exhibit superior performance over multiple hazard levels.

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Potentiality of Using Vertical and Three-Dimensional Isolation Systems in Nuclear Structures

Cited by 60 publications

References 4 publications

Seismic Performance Evaluation of Double‐Skin Semi‐Base‐Isolated Building Using Incremental Dynamic Analysis

Seismic Performance Evaluation of Double‐Skin Semi‐Base‐Isolated Building Using Incremental Dynamic Analysis

Evaluation and research needs for seismically isolating nuclear power plants

Evaluating adaptive vertical seismic isolation for equipment in nuclear power plants

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