The Structural Engineer > Archive > Volume 33 (1955) > Issues > Issue 7 > Prestressed Concrete Beams
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Prestressed Concrete Beams

FAILURE of a prestressed concrete beam in bending* is caused initially either by yielding of the steel near the bottom face (Primary tension failure), or by crushing of the concrete near the top face (Primary compression failure). Primary tension failures occur in beams with low steel ratios, whereas primary compression failures are to be expected in heavily reinforced beams; the two types of failure occur simultaneously for a certain limiting steel ratio r'o which depends on the properties of the two materials and the bond between them. Professor Henry J. Cowan