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Title |
Pullout Bond Characteristics of Untensioned Prestressing Strand
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Keywords |
부착응력 ; 피복두께 ; 묻힘 길이 ; 인장을 가하지 않은 강연선 Bond stress ; Concrete cover ; Embedment length ; Untensioned prestressing strand |
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Abstract |
The primary objective of this research is a study on the pullout bond characteristics of untensioned prestressing strand in concrete. The bond characteristics of untensioned prestressing strand in concrete differs from that of deformed reinforcing bar. In order to use and design untensioned prestressing strand as deformed reinforcing bar, a study for bond characteristics of the untensioned prestressing strand was progressed. Major test variables are embedment length (10db～60db), concrete cover (45mm, 70mm, 100m) and diameter of strands. (12.7mm : SWPC7, 9.3mm : SWPC7A) As a results, these showed that average bond stress was decreased as a growing the embedment length, and then showed that the bond performance of untensioned prestressing strand was improved if embedment length was above 60db.
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