Torsion in Spandrel Beams

by M. Abdul Mansur, Research Fellow; School of Civ. Engrg., Univ. of New South Wales, Sydney, Australia,
B. Vijaya Rangan, (M.ASCE), Sr. Lect.; School of Civ. Engrg., Univ. of New South Wales, Sydney, Australia,

Serial Information: Journal of the Structural Division, 1978, Vol. 104, Issue 7, Pg. 1061-1075

Document Type: Journal Paper

Discussion: Hwang C. S. (See full record)
Closure: (See full record)


In a reinforced concrete spandrel beam, reduction in torsional moment can occur due to redistribution of internal actions after cracking. As a result, design based on the conventional elastic method has often been found to be uneconomical. In the present study, four different methods of design are investigated. The investigation consisted of testing seven T-shaped specimens. These specimens represented the spandrel-floor beam system both at the midspan region and the region near the support of a continuous spandrel beam. The results obtained from the tests are examined and the amount of steel required by different methods are compared. It is found that the ACI method gives the most desirable and economic design for the entire length of the spandrel.

Subject Headings: Torsion | Beams | Reinforced concrete | Continuous beams | Concrete beams | Elastic analysis | Plastic design | Cracking | Moment distribution

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