ACI code torsion equations modified for rectangular concrete beams with an opening

Abstract EN

The ACI Code torsion equations for concrete beams of solid cross-section have been modified to predict the torsional strength of rectangular beams with a transverse opening.

The equations have also been adapted to include the effect of torsion-bending' interaction at low TIM ratios.

A comparison with available test results of fifty-one beams subjected to different combinations of torsion, bending and shear shows excellent agreement between the predicted values and the experimental results at all ranges ofTIM ratios.

Results of torsion tests on twenty-three plain concrete and partially reinforced concrete beams with a rectangular opening are also presented.-