Elastic-plastic behavior of AP1000 nuclear island structure under mainshock-aftershock sequences

Wang, Dayang; Wu, Chengqing; Zhang, Yongshan; Ding, Zixiang; Chen, Wanruo

doi:10.1016/j.anucene.2018.09.015

Cited by 27 publications

(2 citation statements)

References 29 publications

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“…In order to better analyze the dynamic characteristics of the nuclear island structure, the Lanczos method was adopted to perform a modal analysis on CAP1400 structure [13,14]. According to [15,16], the first ten modes were chosen for extraction in this research, and it was found that the natural vibration period of the first two modals of the nuclear island structure was about 0.23 s (Table 1). e modes were mainly expressed as the beam translation in the Y-and X-directions (Figure 3).…”

Section: Modal Analysis Of Nuclear Island Structurementioning

confidence: 99%

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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Section: Modal Analysis Of Nuclear Island Structurementioning

confidence: 99%

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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“…Hence, in recent years, there has been a growing interest in the performance evaluation of structures subjected to seismic sequences. These studies investigated the impact of seismic sequences on various types of structures, such as conventional frames (Khansefid 2021a; Ghasemi et al, 2021; Moustafa and Takewaki 2016; Trevlopoulos et al, 2020), structures equipped with vibration control systems (Han et al, 2014; Rinaldin et al, 2017; Khansefid 2021b; Zhai et al, 2017), dams (Wang et al, 2017; Zhang et al, 2013), bridges (Chen et al, 2022; Ge et al, 2012), nuclear structure (Wang et al, 2019) and reticulated dome (Zhang et al, 2020). In addition, new studies were conducted using self-centering techniques to improve the seismic performance of structures under seismic sequences (Silwal and Ozbulut 2018; Shi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Aftershock fragility assessment of steel gabled frames consisting of web-tapered members

Malekizadeh

Fanaie

Pirasteh

2023

Advances in Structural Engineering

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Due to the widespread construction of steel gabled frame systems throughout the world, many of them are located in regions with high seismicity and experience sequential strong events in the future. Previous studies have clearly shown that the damage caused by the mainshock modifies the overall strength and stiffness and consequently dynamic response to the aftershock. However, the current structural design process only considers the main seismic event, and the post-mainshock scenarios and their effects are generally ignored. In order to address this issue, in the present study, the mainshock incremental dynamic analysis (IDA) was first conducted on four SGFs. Then mainshock damage states based on the transient absolute maximum drift angle were considered, and aftershock incremental dynamic analysis analysis was performed on the mainshock-damaged structures. Aftershock fragility curves using probabilistic seismic demand models for transient absolute maximum drift angle and median IDA curves for residual absolute maximum drift angle were developed to compare intact and pre-damaged SGFs. The results showed that aftershocks significantly increase the vulnerability of short-period SGFs when higher damages are induced during mainshock, where the aftershock collapse capacity is reduced by up to 13% for the largest mainshock damage state. It was also found that in terms of aftershock collapse capacity associated with the residual absolute maximum drift angle, long-period SGFs require major realignment while short-period SGFs cannot be repaired.

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Seismic fragility assessment on the post-mainshock damaged shield building considering aftershock duration and damage ratio

Zhao

Zhou

Huang

et al. 2022

Bull Earthquake Eng

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Elastic-plastic behavior of AP1000 nuclear island structure under mainshock-aftershock sequences

Cited by 27 publications

References 29 publications

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

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

Aftershock fragility assessment of steel gabled frames consisting of web-tapered members

Seismic fragility assessment on the post-mainshock damaged shield building considering aftershock duration and damage ratio

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