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Title: Effects of the Time-Dependent Behaviour of Concrete in Prestressed Concrete Members

Author(s): Heinrich Trost

Publication: Symposium Paper

Volume: 76

Issue:

Appears on pages(s): 301-308

Keywords: concretes; deformation; prestressed concrete; prestress-ing steels; prestress loss; stress relaxation; stress-strain relationships.

DOI: 10.14359/6792

Date: 10/1/1982

Abstract:
An appropriate time-dependent constitutive relation of concrete based on the physical principle of superposition is derived. This simple stress-strain relation is discussed in solving relaxation problems in which the change of stresses is asked for under given strain conditions. In the discussion of special problems in prestressed concrete, first demonstrated are the differential settlements of supports of continuous beams. The time-dependent deformations and changes of stresses in steel and concrete are illustrated. An especially useful equation is given for calculating the so-called loss of prestress force under the real conditions of the bonded steel in the concrete section.