Six fatigue tests were performed on pretensioned concrete beams containing debonded strands to determine if their behavior would be similar to the behavior observed from statically loaded companion beams. Each initially "precracked" beam specimen was subjected to at least one million cycles of equivalent service load. Periodically, large static overloads were applied to each specimen to simulate the relatively large permit loads that some structures may be required to resist, and to increase strand bonding requirements. Loads, deflections, and strand slips were measured at significant intervals and beam behaviors were observed. After completion of fatigue testing, the beams were loaded statically until failure. The tests demonstrated that although repeated loading may cause some additional slippage, the strand slips remained quite small and did not affect the overall beam behavior. Furthermore, the ultimate behavior of these beams verifies that the prediction for bond failure is dependent on the propagation of cracking through the transfer zone of a debonded strand, confirming similar results obtained from static tests.
