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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 71
COMPUTATIONAL CIVIL AND STRUCTURAL ENGINEERING
Edited by: G. De Roeck and B.H.V. Topping
Paper VI.4

Nonlinear Dynamic Buckling Analysis of a Grid Structure

K.H. Yoon+, K.N. Song+ and Y.S. Lee#

+Advanced Reactor Development, Korea Atomic Energy Research Institute, Taejon, Korea
#Department of Mechanical Engineering, Chungnam National University, Taejon, Korea

Full Bibliographic Reference for this paper
K.H. Yoon, K.N. Song, Y.S. Lee, "Nonlinear Dynamic Buckling Analysis of a Grid Structure", in G. De Roeck, B.H.V. Topping, (Editors), "Computational Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 121-126, 2000. doi:10.4203/ccp.71.6.4
Abstract
The spacer grid is one of the main structural components in the fuel assembly, which supports the fuel rods, guides cooling water, and protects the system from an external impact load, such as earthquakes. Therefore, the mechanical and structural properties of the spacer grids must be extensively examined while designing it. In this paper, a numerical method for predicting the buckling strength of spacer grids is presented. Numerical analyses on the buckling behavior of the spacer grids are performed for a various array of sizes of the grids considering that the spacer grid is an assembled structure with thin-walled plates and imposing proper boundary conditions by nonlinear dynamic finite element method using ABAQUS/Explicit. Buckling tests on several kinds of specimens of the spacer grids were also carried out in order to compare the results between the test and the simulation results. A free fall carriage on the specimen accomplishes the test. From this test, the specimens are buckled only at the uppermost and the lowermost layer among the multi-cells, which is similar to the local buckling at the weakest point of the grid structure. The simulated results also similarly predicted the local buckling phenomena and were found to give good correspondence with the experimental values for the thin-walled grid structures. In addition, a correlation that can predict the maximum buckling strength having a number of cells in the grids, is empirically derived from the simulation results.

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