프리텐션 부재의 휨부착에 의한 강연선 정착길이 연구

An Experimental Study on Development Length of Strand in Pretensioned Concrete Members

An experimental study was carried out to estimate development lengths of the prestressing strand in pretensioned beams. Recent studies had indicated that current desing provision were inadequate. Objective of this investigation is to determine the effect of strand diameter and concrete cover in pretensioned beams. Strand of the 1.52cm diameter is more useful and economic than that of the 12.7mm diameter, but current provision does not include 15.2mm diameter strand in experimental data. Because the property of strand has been developed, current provision need to be improved. Based on the experimental data, it was determined that bond failure would be prevented if no cracking occured in transfer zone of a pretensioned strand.