A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of Strand Transfer and Development Lengths in Pretensioned Girders with Semi-Lightweight Concrete
Indiana has been using lightweight aggregate consisting mostly of expanded shale in the production of prestressed concrete bridge girders for several projects. The lightweight aggregate has been used as partial replacement for regular gravel or crushed limestone coarse aggregate. This semi-lightweight concrete weights around 2080 kg/cu m. In a study sponsored by the FHWA, the current AASHTO equations for the calculation of transfer and development lengths of prestresssing strand were found to be unconservative in the case of lightweight concrete members with unit weight less than 1920 kg/cu m. This finding raises a question regarding the applicability of the same equations to semi-lightweight concrete members. The objective of this study co-sponsered by the Indiana Department of Transportation and the Federal Highway Administration is to determine if the current AASHTO Specifications are applicable to semi-lightweight pretensioned concrete bridge members. The study addresses the transfer and development lengths of 13.3 mm and 15.2 mm pretensioned strand on semi-lightweight concrete girders with concrete compressive strength of 48 MPa for the 13.3 mm strand and 69 MPa for the 15.2 mm strand. Two strand types were considered in this study.
Evaluation of Strand Transfer and Development Lengths in Pretensioned Girders with Semi-Lightweight Concrete
Indiana has been using lightweight aggregate consisting mostly of expanded shale in the production of prestressed concrete bridge girders for several projects. The lightweight aggregate has been used as partial replacement for regular gravel or crushed limestone coarse aggregate. This semi-lightweight concrete weights around 2080 kg/cu m. In a study sponsored by the FHWA, the current AASHTO equations for the calculation of transfer and development lengths of prestresssing strand were found to be unconservative in the case of lightweight concrete members with unit weight less than 1920 kg/cu m. This finding raises a question regarding the applicability of the same equations to semi-lightweight concrete members. The objective of this study co-sponsered by the Indiana Department of Transportation and the Federal Highway Administration is to determine if the current AASHTO Specifications are applicable to semi-lightweight pretensioned concrete bridge members. The study addresses the transfer and development lengths of 13.3 mm and 15.2 mm pretensioned strand on semi-lightweight concrete girders with concrete compressive strength of 48 MPa for the 13.3 mm strand and 69 MPa for the 15.2 mm strand. Two strand types were considered in this study.
Evaluation of Strand Transfer and Development Lengths in Pretensioned Girders with Semi-Lightweight Concrete
R. J. Peterman (author) / J. A. Ramirez (author) / J. Olek (author)
1999
208 pages
Report
No indication
English
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