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http://dx.doi.org/10.12652/Ksce.2010.30.6A.543

Evaluation of Local Effect Prediction Formulas for RC Slabs Subjected to Impact Loading  

Chung, Chul-Hun (단국대학교 토목환경공학과)
Choi, Hyun (단국대학교 토목환경공학과)
Lee, Jung Whee (단국대학교 토목환경공학과)
Choi, Kang Ryong (한국원자력안전기술원 구조부지실)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.30, no.6A, 2010 , pp. 543-560 More about this Journal
Abstract
Safety-related concrete structures in a nuclear power plant must be protected against the impact of flying objects, referred to in the profession as missiles. In practice, the structural verification is usually carried out by means of empirical formulas, which relate the velocity of the impinging missile to the wall thickness needed to prevent scabbing or perforation. The purpose of this study is to reevaluate the predictability of the local effect prediction formulas for the penetration and scabbing depths and perforation thickness. Therefore, available formulas for predicting the penetration depth, scabbing thickness, and perforation thickness of concrete structures impacted by solid missiles are summarized, reviewed, and compared. A series of impact analyses is performed to predict the local effects of the projectile at impact velocities varing from 95 to 215 m/s. The results obtained from the numerical simulations have been compared with tests that were carried out at Kojima to validate numerical modelling. The simulation results show reasonable agreement with the Kojima test results for the overall impact response of the RC slabs. From these results, it seems that the Degen equation give a very good estimate of perforation thickness against a tornado projectile for test data. Finally, the results obtained from the impact analysis have been compared with Degen formula to determine the perforation thickness of the RC slab.
Keywords
penetration; scabbing; perforation; local effect prediction formulas; impact analysis; projectile;
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