Plastic Flow of Concrete at High Overlaod


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Title: Plastic Flow of Concrete at High Overlaod

Author(s): J. R. Shank

Publication: Journal Proceedings

Volume: 45

Issue: 2

Appears on pages(s): 493-498

Keywords: no keywords

Date: 2/1/1949

Neew data on the plastic flow of concrete prompted a reconsideration of the assumption that plastic flow is directly proportional to the unit stress applied. Tests are described in which deformations of 6 x 12-in. concrete cylinders were measured while undersustained loads approaching the ultimate strength. Plotted data are shown to demonstrate that the change in the rate of plastic flow appears to be uniform up to three-quarters or more of the ultimate strength with an abrupt change at the "true" ultimate strength. Included are other data indicating that the plastic flow curve has the same general form independent of time and applied load leading to a new consideration in expressing factor of safety and developing beam theories on a factor of safety basis.