Critique of Current Methods of Varying Prestressing Moment in Pretensioned Prismatic Beams

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Title: Critique of Current Methods of Varying Prestressing Moment in Pretensioned Prismatic Beams

Author(s): James R. Libby

Publication: Journal Proceedings

Volume: 56

Issue: 11

Appears on pages(s): 391-408

Keywords: none

Date: 11/1/1959

Abstract:
Three methods currently used to vary the prestressing moment in the construction of prismatic pretensioned concrete flexural members are: bond prevention method; deflected pretensioned tendon method; and the combination of pretensioned and post-tensioned tendons. Each of these methods is described, and its limitations discussed. Comparison is made between the results which can be achieved with each method on a bridge stringer representative of the type commonly used in domestic composite bridge construction. Conclusions are made regarding the applicability of each of the methods and the research required to better apply the methods.