THE USE OF HIGH-STRENGTH PRESTRESSING STEEL STRANDS AND HIGH-STRENGTH CONCRETE IN PRESTRESSED CONCRETE GIRDERS

Abstract eng:
Japan Prestressed Concrete Engineering Association set up the technical committee on "Application of High Strength Prestressing Tendons to Prestressed Concrete Structures"(Chair was Emeritus Prof. Wataru Koyanagi at Gifu Univ.) in 2009. This paper describes application of high-strength prestressing tendons to actual PC bridges from Guidelines for Design and Construction of High Strength Prestressing Tendons to PC Structures. Five full-size bridges using concrete with strengths of 40 MPa (n=4) or 60 MPa (n=1) and prestressing steel strands with a tensile strength of 1600 MPa (n=2) or 1900 MPa (n=3) were designed to study this concept. The studied prestressed concrete (PC) girder types were continuous frame box PC girders (n=2) and continuous box PC girders (n=3). Design results indicate that the cable length as well as the weight and number of cables in girders were reduced by 23-25%, 17-20%, and 22-25% respectively by increasing both concrete strength and prestressing steel strand-strength. Further, the height of the continuous PC girder constructed using normal-strength concrete and high-strength prestressing steel strand was reduced by 15% while the girder span increased by 17 percent.

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