Anchorage Zone Cracking of Post-Tensioned Bridge Decks with Closely Spaced Anchors

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Title: Anchorage Zone Cracking of Post-Tensioned Bridge Decks with Closely Spaced Anchors

Author(s): J. A. Burgess, J. E. Breen and R. W. Poston

Publication: Special Publication

Volume: 113

Issue:

Appears on pages(s): 79-108

Keywords: anchorage (structural); bridge decks; cracking (fracturing); post-tensioning; prestressed concrete; spiral reinforcement; stresses; tests; Structural Research

Date: 4/1/1989

Abstract:
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.