Equations for predicting the torsional strength of longitudinally reinforced concrete beams that contain an opening to accommodate service ducts are presented and the results are compared with the test results of 29 beams. The strength of beams containing a short opening can be significantly larger than the strength predicted by the theory because the spiral crack extends into the solid portion of the beam. However, the equations can be modified empirically so that they satisfactorily predict the torsional strength. Although all the beams tested were subjected to pure torsion, the analysis includes the shear and moment due to self weight of the beam and can thus easily be extended to include members supporting external loads that cause shear and bending. /AUTHOR/

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  • Corporate Authors:

    American Concrete Institute

    P.O. Box 19150, Redford Station, 22400 Seven Mile Road
    Detroit, MI  United States  48219
  • Authors:
    • McMullen, A E
    • Daniel, H R
  • Publication Date: 1975-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00127137
  • Record Type: Publication
  • Report/Paper Numbers: 72-29
  • Files: TRIS
  • Created Date: Jan 14 1976 12:00AM