Browse > Article
http://dx.doi.org/10.5000/EESK.2015.19.6.293

Effect of Rocking Behavior of Isolated Nuclear Structures and Sampling Technique for Isolation-System Properties on Clearance-to-stop  

Han, Min Soo (Department of Civil Engineering, Kookmin University)
Hong, Kee Jeung (Department of Civil Engineering, Kookmin University)
Cho, Sung Gook (R&D Center, Innose Tech Co. Ltd.)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.19, no.6, 2015 , pp. 293-302 More about this Journal
Abstract
ASCE 4 requires that a hard stop be built around the seismic isolation system in nuclear power plants. In order to maintain the function of the isolation system, this hard stop is required to have clearance-to-stop, which should be no less than the 90th-percentile displacements for 150% Design Basis Earthquake (DBE) shaking. Huang et al. calculated clearance-to-stop by using a Latin Hypercube Sampling technique, without considering the rocking behavior of the isolated structure. This paper investigates the effects on estimation of clearance-to-stop due to 1) rocking behavior of the isolated structure and 2) sampling technique for considering the uncertainties of isolation system. This paper explains the simplified analysis model to consider the rocking behavior of the isolated structure, and the input earthquakes recorded at Diablo Canyon in the western United States. In order to more accurately approximate the distribution tail of the horizontal displacement in the isolated structure, a modified Latin Hypercube Sampling technique is proposed, and then this technique was applied to consider the uncertainty of the isolation system. Through the use of this technique, it was found that rocking behavior has no significant effect on horizontal displacement (and thus clearance-to-stop) of the isolated structure, and the modified Latin Hypercube Sampling technique more accurately approximates the distribution tail of the horizontal displacement than the existing Latin Hypercube Sampling technique.
Keywords
Nuclear structure; Isolation; Clearance-to-stop; Rocking; Sampling technique;
Citations & Related Records
연도 인용수 순위
  • Reference
1 American Society of Civil Engineers (ASCE). Seismic analysis of safety-related nuclear structures and commentary. ASCE 4-**, (forthcoming). Reston, VA.
2 Huang in, Whittaker AS, Kennedy RP, Mayes RL. Assessment of Base-Isolated Nuclear Structures for Design and Beyond-Design Basis Earthquake Shaking. Technical Report MCEER0-09-0008. c2009.
3 Computer Program SASSI. Theoretical Manual. Bechtel Corporation, San Francisco,CA; c1991.
4 Anil K. Chopra et al. Dynamics of Structures. Fourth edition. Pearson, California, 2012.
5 Kim JH, Kim MK, Choi IK. Response of Base Isolation System Subjected to Spectrum Matched Input Ground Motions, Conference Proceeding on Earthquake Engineering Society of Korea, EESK; c2013.
6 Huang YN, Whittaker AS, Luco N. Maximum and geometric-mean spectral demands in the near-fault region, Processing, 19th International Conference on Structural Mechanics in Reactor Technology; Toronto, Canada; c2007.