Anchorage Zone Cracking of Post-Tensioned Bridge Decks with Closely Spaced Anchors
J. A. Burgess, J. E. Breen and R. W. Poston
Appears on pages(s):
anchorage (structural); bridge decks; cracking (fracturing); post-tensioning; prestressed concrete; spiral reinforcement; stresses; tests; Structural Research
An experimental investigation was conducted to examine cracking of post-tensioned bridge deck anchorage zones with closely spaced anchors. The test program included full-scale tests of bridge deck anchorage zones with single and closely spaced anchorages. Half of the test specimens contained additional spiral anchorage zone reinforcement. The test results indicate that when the anchorages are closely spaced, a previously stressed anchor tends to precompress the anchorage zone of an adjacent anchor and slightly increases its cracking load. In heavily reinforced bridge decks, additional spiral anchorage zone reinforcement provides only a slight to moderate increase in the anchorage zone cracking or ultimate load. Predicted cracking loads based on ACI-PTI's allowable stress provisions were generally conservative for single and closely spaced bridge deck anchorages.