EFFECT OF SPECIMEN SIZE OF STATIC COMPRESSIVE TEST ON THE DYNAMIC INCREASE FACTOR OF CONCRETE COMPRESSIVE STRENGTH
Author(s)
SANGHO LEE, CHUNGHYEON KIM, JAE-YEOL CHO
Abstract
Compressive strength of concrete increases as the strain rate increases, so this rate effect should be considered when conducting finite element analysis to evaluate behavior of structure under high strain rate. Accordingly, numerous split Hopkinson pressure bar (SHPB) tests have been conducted to evaluate dynamic strength at high strain rate. However, there is no standard test method for SHPB test. As a result, researchers have performed SHPB test for concrete and analyzed the results as their own method. Especially, since various sizes of specimen have been used for SHPB test, various shapes and sizes of specimens have been used for static compressive test to obtain static strength. In this study, SHPB test for concrete specimen was performed. Then, finite element analyses of concrete SHPB test were conducted using two types of dynamic increase factor (DIF) obtained from two types of static strengths in order to find out which static strength is appropriate to obtain DIF; one is static strength from standard cylinder specimen, and the other is static strength from specimen of same diameter as that of specimen of SHPB test. Then, the results were compared to each other. The comparison showed that DIF obtained from standard cylinder test is more valid than DIF obtained from specimen of same diameter as SHPB test specimen.
Keywords
dynamic increase factor, split Hopkinson pressure bar, rate effect, static strength
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