Balanced Design of Prestressed Concrete Beams


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Title: Balanced Design of Prestressed Concrete Beams

Author(s): Henry J. Cowan

Publication: Journal Proceedings

Volume: 51

Issue: 4

Appears on pages(s): 773-784

Keywords: no keywords

Date: 4/1/1955

Equations are derived for the design of prestressed sections to develop the full value of permissible stresses in concrete both at the top and bottom of the beam during the prestressing operation as well as under the action of superimposed loads. A simple solution is obtained if the maximum permissible stresses are the same during the prestressing operation and under load. The more complicated solution for differential permissible stresses, however, gives greater economy in materials. Two examples are worked out, which demonstrate that balanced design is primarily useful for the heavily loaded beam and the beam with restricted depth.