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Title |
Investigation on Applicability of 2400 MPa Strand for Posttensioned Prestressed Concrete Girders
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DOI |
https://doi.org/10.4334/JKCI.2012.24.6.727 |
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Keywords |
고강도 강연선 ; 긴장재 ; 프리스트레스트 콘크리트 거더 ; 포스트텐션 ; high-strength strand ; prestressing tendon ; prestressed concrete girder ; post-tension |
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Abstract |
Recently, a high-strength strand of 2400 MPa was developed using domestic technologies. In 2011, KS D 7002 was revised to cover the newly developed high-strength strands to support their practical usage. Presently, however, discussions and evaluations are not sufficient on the mechanical properties of the strands and their performance in structural members. Also, there were no detailed reviews on the need to revise the current design code for practical use of the high-strength strands. In this study, flexural behavior of a member with the high-strength strands was estimated through sectional analysis and a review and comparison of the domestic and foreign design codes were conducted considering the analysis results. Also, the need for the revision of the design code was discussed. Such discussion especially focused on the estimation of the stress in strand, which related with various issues such as determination methods for yield point of strands, time-dependent loss of prestressing force, estimation of stress in strand at member failure, and net strain limit for ductile failure of member. The discussion revealed that some parts in the design code need a revision and the further studies are required.
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