Abstract
Cover of prestressed tendons is an important factor that influences the transmission of prestress by bond. This paper describes a study of the influence of cover on the bond behaviour of prestressed pretensioned strands. Ten beams with different cover values were produced and tested. Bond at different levels of the percentage of transferring was studied. A second type of test was also performed to observe the behaviour of the beams when placed on two supports at the extremities and subjected to a point load at mid-span. Previous research works on bond of pretensioned tendons to concrete are presented in this paper. The experimental programme carried out at the University of Coimbra is described. Results from the tests are presented, analysed, and compared with Canadian, American, and European regulations. The results show that, in general, when the cover increases the transmission length decreases. A bilinear relationship between the transmission length and the cover is presented. The beams were placed simply supported and tested up to failure by means of a point load at mid-span. These tests showed that beams with a 20-mm cover withstood a load significantly lower than that predicted theoretically.Key words: prestress, bond, cover, concrete beams, prestressed structures, structural concrete.
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