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Investigation of bond in 3/8 inch diameter strand for pretensioned concrete members Suryaprakasam, Kunapuli

Abstract

A direct method which was useful for repeated quick tests was presented to determine the bond anchorage length for 3/8 inch diameter strand and the distribution of bond forces within the anchorage length. Seventy-four specimens were tested. Three different cross sections were tried, namely 4 in. x 4 in., 3 in. x 3 in. and 2 in. x 2 in. Two types of load conditions were tested, tensioned and untensioned. From the experimental results it was observed that friction appears to be the major component determining the bond strength. The bond strength of strand does not appear to be significantly affected by the degree of initial steel stress in concrete. The anchorage length for 3/8 inch diameter rusted strand was found to be between 8 and 10 inches for a force of 13 to 14 kips.

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