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- 주제어 : Earthquake intensity measure (검색결과 4 건)
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Nguyen, Duy-Duan,Thusa, Bidhek,Han, Tong-Seok,Lee, Tae-Hyung Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.1
Seismic design practices and seismic response analyses of civil structures and nuclear power plants (NPPs) have conventionally used the peak ground acceleration (PGA) or spectral acceleration (S<sub>a</sub>) as an intensity measure (IM) of an earthquake. However, there are many other earthquake IMs that were proposed by various researchers. The aim of this study is to investigate the correlation between seismic responses of NPP components and 23 earthquake IMs and identify the best IMs for correlating with damage of NPP structures. Particularly, low- and high-frequency ground motion records are separately accounted in correlation analyses. An advanced power reactor NPP in Korea, APR1400, is selected for numerical analyses where containment and auxiliary buildings are modeled using SAP2000. Floor displacements and accelerations are monitored for the non- and base-isolated NPP structures while shear deformations of the base isolator are additionally monitored for the base-isolated NPP. A series of Pearson's correlation coefficients are calculated to recognize the correlation between each of the 23 earthquake IMs and responses of NPP structures. The numerical results demonstrate that there is a significant difference in the correlation between earthquake IMs and seismic responses of non-isolated NPP structures considering low- and high-frequency ground motion groups. Meanwhile, a trivial discrepancy of the correlation is observed in the case of the base-isolated NPP subjected to the two groups of ground motions. Moreover, a selection of PGA or S<sub>a</sub> for seismic response analyses of NPP structures in the high-frequency seismic regions may not be the best option. Additionally, a set of fragility curves are thereafter developed for the base-isolated NPP based on the shear deformation of lead rubber bearing (LRB) with respect to the strongly correlated IMs. The results reveal that the probability of damage to the structure is higher for low-frequency earthquakes compared with that of high-frequency ground motions.
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Xiang Liu,Lizhong Jiang,Ping Xiang,Yulin Feng,Zhipeng Lai,Xiaoyun Sun 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.2
Due to the large number of railway bridges along China's high-speed railway (HSR) lines, which cover a wide area with many lines crossing the seismic zone, the possibility of a HSR train running over a bridge when an earthquake occurs is relatively high. Since the safety performance of the train will be threatened, it is necessary to study the safety of trains running over HSR bridges during earthquakes. However, ground motion (GM) is highly random and selecting the appropriate groundmotion intensity measures (IMs) for train running safety analysis is not trivial. To deal this problem, a model of a coupled trainbridge system under seismic excitation was established and 104 GM samples were selected to evaluate the correlation between 16 different IMs and train running safety over HSR bridges during earthquakes. The results show that spectral velocity (SvT1) and displacement (SdT1) at the fundamental period of the structure have good correlation with train running safety for mediumand long-period HSR bridges, and velocity spectrum intensity (VSI) and Housner intensity (HI) have good correlation for a wide range of structural periods. Overall, VSI and HI are the optimal IMs for safety analysis of trains running over HSR bridges during earthquakes. Finally, based on VSI and HI, the IM thresholds of an HSR bridge at different speed were analyzed.
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응웬두이두안(Nguyen, Duy-Duan),삼다니아자드(Azad, Md Samdani),최병호(Choi Byung H.),이태형(Lee, Tae-Hyung) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.6
본 논문의 목적은 일체형교대교량의 지진취약도를 평가하는데 적합한 지진강도지표(IM)를 판별하는 것이다. 90개의 지진가속도기록과 20가지 IM을 고려한 비선형시간이력해석을 수행하여 교각의 횡방향변위를 관찰하였다. 교량의 내진성능과 상관도가높은 IM을 판별하기 위해 결정계수, 표준편차, 상관계수 등 다양한 통계인자를 고려하였다. 수치해석결과 상관도가 높은IM은 고유주기에서의 스펙트럼가속도, 스펙트럼속도, 스펙트럼변위와 ASI, EPA, PGA, A95 등으로 나타났다. 상관도가 높은IM를 기준으로 한 교량의 지진취약도곡선을 도출하였다. The purpose of this study is to identify efficient earthquake intensity measures (IMs) for evaluating the seismic vulnerability of integral abutment bridges. A total of 90 ground motion records and 20 typical IMs were employed for the numerical analyses. A series of nonlinear time-history analyses was performed on the bridges to observe the lateral displacement of the bridge piers. Statistical parameters such as the coefficient of determination, standard deviation, and correlation coefficient were calculated to identify the strongly correlated IMs with the seismic performance of the bridges. The numerical results show that the efficient IMs are spectral acceleration, spectral velocity, spectral displacement at the fundamental period, acceleration spectrum intensity, effective peak acceleration, peak ground acceleration, and A95. Moreover, a set of fragility curves of the bridges was developed with respect to the efficient IMs.
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Duy-Duan Nguyen,Bidhek Thusa,Md Samdani Azad,Viet-Linh Tran,이태형 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
This study identifies efficient earthquake intensity measures (IMs) for seismic performances and fragilityevaluations of the reactor containment building (RCB) in the advanced power reactor 1400 (APR1400)nuclear power plant (NPP). The computational model of RCB is constructed using the beam-truss model(BTM) for nonlinear analyses. A total of 90 ground motion records and 20 different IMs are employed fornumerical analyses. A series of nonlinear time-history analyses are performed to monitor maximum floordisplacements and accelerations of RCB. Then, probabilistic seismic demand models of RCB are developedfor each IM. Statistical parameters including coefficient of determination (R2), dispersion (i.e. standarddeviation), practicality, and proficiency are calculated to recognize strongly correlated IMs with theseismic performance of the NPP structure. The numerical results show that the optimal IMs are spectralacceleration, spectral velocity, spectral displacement at the fundamental period, acceleration spectrumintensity, effective peak acceleration, peak ground acceleration, A95, and sustained maximum acceleration. Moreover, weakly related IMs to the seismic performance of RCB are peak ground displacement,root-mean-square of displacement, specific energy density, root-mean-square of velocity, peak groundvelocity, Housner intensity, velocity spectrum intensity, and sustained maximum velocity. Finally, a set offragility curves of RCB are developed for optimal IMs.
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