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RISS 인기검색어
- 검색키워드
- 저자 : CHAOBI ZHANG (검색결과 4 건)
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CHAOBI ZHANG,Jianyun Chen,Jing Li 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
This work focuses on the safety margin of Prestressed Concrete Containment Vessel (PCCV) under internal pressure beyond the design load up to its ultimate strength. Due to the complicated configurations of rebars and tendons, an integral constitutive model was developed to simulate the PCCV to reduce computational complexity and improve calculation efficiency. The integral stress-strain relationship considers the nonlinear properties of concrete, rebars and tendons, and can reflect the material failure procedure. The PCCV model is three-dimensional axisymmetric and considers critical structural characteristics. Our numerical results can successfully predict the failure mode. The maximum deflection is expected at the mid-height of the wall near the equipment hatch hole. When the strain of the steel liner reaches tearing strain 3×10−3, the corresponding internal pressure is 3.04 Pd (design pressure) which meets the internationally required value (2.5 Pd). And our analysis is in good agreement with most of the previous results.
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CHAOBI ZHANG,Jianyun Chen,Qiang Xu,Jing Li 한국원자력학회 2015 Nuclear Engineering and Technology Vol.47 No.5
In order to analyze the mechanical properties of two-way different configurations of prestressedconcrete members subjected to axial loading, a finite element model based on thenuclear power plant containments is demonstrated. This model takes into account theinfluences of different principal stress directions, the uniaxial or biaxial loading, andbiaxial loading ratio. The displacement-controlled load is applied to obtain the stressestrain response. The simulated results indicate that the differences of principal stressaxes have great effects on the stressestrain response under uniaxial loading. When thespecimens are subjected to biaxial loading, the change trend of stress with the increase ofloading ratio is obviously different along different layout directions. In addition, correlationexperiments and finite element analyses were conducted to verify the validity and reliabilityof the analysis in this study.
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Dynamic Analysis of AP1000 Shield Building Considering Fluid and Structure Interaction Effects
Xu, Qiang,Chen, Jianyun,Zhang, Chaobi,Li, Jing,Zhao, Chunfeng Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.1
The shield building of AP1000 was designed to protect the steel containment vessel of the nuclear reactor. Therefore, the safety and integrity must be ensured during the plant life in any conditions such as an earthquake. The aim of this paper is to study the effect of water in the water tank on the response of the AP1000 shield building when subjected to three-dimensional seismic ground acceleration. The smoothed particle hydrodynamics method (SPH) and finite element method (FEM) coupling method is used to numerically simulate the fluid and structure interaction (FSI) between water in the water tank and the AP1000 shield building. Then the grid convergence of FEM and SPH for the AP1000 shield building is analyzed. Next the modal analysis of the AP1000 shield building with various water levels (WLs) in the water tank is taken. Meanwhile, the pressure due to sloshing and oscillation of the water in the gravity drain water tank is studied. The influences of the height of water in the water tank on the time history of acceleration of the AP1000 shield building are discussed, as well as the distributions of amplification, acceleration, displacement, and stresses of the AP1000 shield building. Research on the relationship between the WLs in the water tank and the response spectrums of the structure are also taken. The results show that the high WL in the water tank can limit the vibration of the AP1000 shield building and can more efficiently dissipate the kinetic energy of the AP1000 shield building by fluid-structure interaction.
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Dynamic Analysis of AP1000 Shield Building Considering Fluid and Structure Interaction Effects
Qiang Xu,Jianyun Chen,CHAOBI ZHANG,Jing Li,Chunfeng Zhao 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.1
The shield building of AP1000 was designed to protect the steel containment vessel of thenuclear reactor. Therefore, the safety and integrity must be ensured during the plant life inany conditions such as an earthquake. The aim of this paper is to study the effect of waterin the water tank on the response of the AP1000 shield building when subjected to threedimensionalseismic ground acceleration. The smoothed particle hydrodynamics method(SPH) and finite element method (FEM) coupling method is used to numerically simulatethe fluid and structure interaction (FSI) between water in the water tank and the AP1000shield building. Then the grid convergence of FEM and SPH for the AP1000 shield building isanalyzed. Next the modal analysis of the AP1000 shield building with various water levels(WLs) in the water tank is taken. Meanwhile, the pressure due to sloshing and oscillation ofthe water in the gravity drain water tank is studied. The influences of the height of water inthe water tank on the time history of acceleration of the AP1000 shield building are discussed,as well as the distributions of amplification, acceleration, displacement, andstresses of the AP1000 shield building. Research on the relationship between the WLs in thewater tank and the response spectrums of the structure are also taken. The results showthat the high WL in the water tank can limit the vibration of the AP1000 shield building andcan more efficiently dissipate the kinetic energy of the AP1000 shield building by fluidstructureinteraction.
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