Abstract
This paper presents the test results of total 24 beam-end specimens to investigate the effect of high-strength con- crete and cover thickness on the development resistance capacity in tensile lap splice length regions. Based on bond characteristics that an increase in concrete strength results in higher bond stress and shortening of the transfer length, cracking behavior that thin cover thickness induced a splitting crack easily and brittle crack propagation, current design code that development length pro- visions as uniform bond stress assumption was investigated apply as it. The results showed that as higher strength concrete was employed, not only development resistance capacity was influenced by cover thickness, but also more sufficient safety factor reserved shorter than the lap splice length provision in current design code. From experimental research results, high-strength con- crete development length was not inverse ratio of but directly inverse of fck, and it is also said that there is a certain limit length of the embedded steel over which the assumption of uniform bond stress distribution is valid specially for high-strength con- crete not having a same embed length such as normal-strength concrete in current design criteria hypothesis. Keyword : bond, cover thickness, development length, high-strength concrete, lap splice length
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