Spirally Prestressed Concrete Cylinders


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Title: Spirally Prestressed Concrete Cylinders

Author(s): C. W. Martin

Publication: Journal Proceedings

Volume: 65

Issue: 10

Appears on pages(s): 837-845

Keywords: creep (materials);cylinders;high strength concretes;prestressed concrete; prestressing;reinforcing steel;spirals;triaxial loads;working stress method (structural).

Date: 10/1/1968

Experiments with 17 spirally prestressed concrete cylinders are described. Spiral prestressing wire volume was 0.6 to 1.2 percent of concrete volume. Ultimate axial stress was increased 2.5 times but was virtually independent of lateral prestress. Axial stress at which Poisson’s ratio deviated from a constant, axial stress at 0.05 percent offset and axial stress at minimum volume were increased by factors of 1.5 to 2.0 by lateral prestressing. Creep rupture occurred at 12.75 ksi (896.4 kgf/cm* ) axial stress but not at 5 ksi (351.5 kgf/cm* ). Four ksi axial compression might be a reasonable working stress for materials and percentages investigated.