Relationship Between Moment Capacity at Flexural Cracking and at Ultimate in Prestressed Concrete Beams

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Title: Relationship Between Moment Capacity at Flexural Cracking and at Ultimate in Prestressed Concrete Beams

Author(s): lfedayo O. Oladapo

Publication: Journal Proceedings

Volume: 65

Issue: 10

Appears on pages(s): 863-875

Keywords: beams (structural);cracking (fracturing);moments;prestressed concrete; structural analysis;ultimate strength method (structural).

Date: 10/1/1968

Abstract:
Presents an analytical study of the variation of the ratio of cracking moment to ultimate moment in prestressed concrete beams. The effect, on the ratio, of variations in the section properties, the limiting tensile stress of concrete and the level of prestress were investigated. The analysis shows that there is a useful range for the steel ratio and that a limitation is necessary for the maximum as well as the minimum steel ratio. It is also shown that a direct control of cracking can be carried out, by stipulating a specified value for the ratio of cracking moment to ultimate moment and permissible stresses can be dispensed with in so far as they are indirect controls of cracking.