HOW TO DESIGN PRESTRESSED CONCRETE BEAMS OF MINIMUM CROSS SECTION

This article should be of interest to the marketing arms of prestressed concrete producers and to design engineers. It revives the nearly forgotten concept that the self-weight of the beam may either be carried free, or it may be compensated for. In either case there is a minimum size of beam that is determined by the superposed loads, a set of limiting stresses chosen by the designer, and the prestress losses. We can zero in on the minimum required size, and select an economical beam from commercially available sizes which is only slightly larger than the absolute minimum. The process is one of direct design, and does not employ trial-and-error with recycling. We will, for the sake of simplicity, confine overselves to simple spans and bare beams. Such beams, to be useful in buildings and bridges, will usually have wide top flanges so that they can support areal loads, whether they be distributed or concentrated. Composite beams are not considered. /Author/

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  • Accession Number: 00082866
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 26 1975 12:00AM