Title:
Influence of Nonprestressed Reinforcement on Strength of Unbonded Partially prestressed concrete members
Author(s):
T. Ivan Campbell and Kevin L. Chouinard
Publication:
Structural Journal
Volume:
88
Issue:
5
Appears on pages(s):
546-551
Keywords:
beams (supports); flexural strength; loads (forces); partial prestressing; prestressing steels; reinforcing steels; structural design; Design
DOI:
10.14359/3141
Date:
9/1/1991
Abstract:
An investigation of the stress in the prestressing tendons at ultimate in unbonded partially prestressed concrete beams is described with particular emphasis on the effects of nonprestressed bonded reinforcement. Load tests on six rectangular section unbonded beams are reported. It is shown that the presence of bonded nonprestressed reinforcement has a marked influence on the flexural behavior of unbonded beams and the related increase of stress in the prestessed steel at ultimate. Test results are compared with prediction from two relevant design codes, and some limitations in the application of these codes to unbonded partially prestressed concrete construction are identified.