Partitioned hybrid method for soil-structure interaction analysis of nuclear power structure

被引：0
|
作者：
Chen S. [1 ,2 ]
Guo Q. [1 ]
Zhou G. [2 ]
机构：
[1] Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
[2] Nuclear and Radiation Safety Center of Ministry of Environmental Protection, Beijing
来源：
Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics | 2020年 / 52卷 / 01期
关键词：
Artificial boundary condition; Modal damping; Partitioned hybrid method; Rayleigh damping; Soil-structure interaction;
D O I：
10.6052/0459-1879-19-271
中图分类号：
学科分类号：
摘要：
Soil-structure interaction analysis is an important step in seismic design and safety assessment of nuclear power structures. Material damping and non-linearity are important factors affecting the structural response in the analysis of soil-structure dynamic interaction of nuclear power structures. If the frequency-domain method is used, the damping can be easily considered, but the equivalent linearization is needed to consider the non-linearity, which is not suitable for strong earthquakes, The time-step integration method is suitable for considering non-linearity, but Rayleigh damping model is generally used for material damping. Except for a few modes with specified damping ratio, the response of other modes will be restrained by the large damping determined by Rayleigh damping model, which makes the seismic response quite different from the real situation. If the modal superposition method is used, the damping effect can be reasonably taken into account, but the non-linearity can not be taken into account in the modal superposition method. Therefore, how to reasonably consider the damping and non-linearity is an important issue in the soil-structure interaction analysis of nuclear power structures. Considering that the main structure of nuclear power plant is rigid, and it is not easy to enter the non-linearity under earthquake, a new method for soil-structure interaction analysis is proposed in this paper. The modal superposition method is used to structure analysis, and the soil and foundation is analyzed by the explicit time-step integration method, the influence of infinite domain (radiation damping) is considered through artificial boundary conditions. This partitioned algorithm of soil-structure interaction based on modal superposition and time-step integration is realized, and verified by a simple example. Then, the soil-structure interaction analysis of a CAP1400 nuclear power structure is conducted, with the modal damping and Rayleigh damping are adopted respectively. The difference between modal damping and Rayleigh damping on the structure and site response is compared and analyzed. The results show that the structural damping model has little effect on the site response, but has obvious effect on the structure response. © 2020, Chinese Journal of Theoretical and Applied Mechanics Press. All right reserved.
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页码：258 / 282
页数：24
相关论文
共 30 条
  • [1] Seismic analysis of safety-related nuclear structure
  • [2] Liao Z.P., Wong H.L., A transmitting boundary for the numerical simulation of elastic wave propagation, Soil Dynamics and Earthquake Engineering, 3, pp. 174-183, (1984)
  • [3] Liu J., Li B., 3D viscoelastic static-dynamic unified artificial boundary, Chinese Science: Engineering Science Materials Science, 35, 9, pp. 966-980, (2005)
  • [4] Gu Y., Liu J., Du Y., 3D consistent viscous-spring artificial boundary and viscousspring boundary element, Engineering Mechanics, 24, 12, pp. 31-37, (2007)
  • [5] Zhang X., Li X., Chen G., Et al., An improved method for calculating equivalent load of viscoelastic artificial boundary, Chinese Journal of Theoretical and Applied Mechanics, 48, 5, pp. 1126-1135, (2016)
  • [6] Kausel E., Damping matrices revisited, Journal of Engineering Mechanics, 140, 8, (2014)
  • [7] Luco J.E., A note on classical damping matrices, Earthquake Engineering & Structural Dynamics, 37, 4, pp. 615-626, (2008)
  • [8] Chopra A.K., McKenna F., Modeling viscous damping in nonlinear response history analysis of buildings for earthquake excitation, Earthquake Engineering & Structural Dynamics, 45, pp. 193-211, (2016)
  • [9] Luco J.E., Lanzi A., Optimal Caughey series representation of classical damping matrices, Soil Dynamics and Earthquake Engineering, 92, pp. 253-265, (2017)
  • [10] Hall J.F., Problems encountered from the use (or misues) of Rayleigh damping, Earthquake Engineering & Structural Dynamics, 35, pp. 525-545, (2006)
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