Strand Debonding for Pretensioned Girders (2017) / Chapter Skim
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Pages 96-100
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From page 96... ...
96 4.1 Conclusions Through a study combining extensive parametric, analytic, numeric, and experimental components, a better understanding of the use of debonded prestressing strands resulted. This study was premised on the concept that debonding prestressing strands are necessary to control stresses resulting from prestressing force released in prestressed concrete girders.
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From page 97... ...
Conclusions and Suggestions 97 • No more than 40% of debonded strands, or four strands, whichever is greater, shall have the debonding terminated at any section. (No change from current AASHTO LRFD Article 5.11.4.3)
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From page 98... ...
98 Strand Debonding for pretensioned Girders • For girders supported across their width, debonded strands shall be uniformly distributed across the flange width between webs. In solid slabs: • No more than 50% of the bottom row shall be debonded.
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From page 99... ...
Conclusions and Suggestions 99 with the intent of minimizing the tie force. The following requirements were developed to design reinforcing to fully resist the tie force: • For single-web flanged sections, the STM shown in Figure 4.3 shall be used to determine the required amount of tie reinforcement required, where t is the tie force to be resisted (Eqs.
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From page 100... ...
100 Strand Debonding for pretensioned Girders are "disturbed" regions where the assumptions implicit in a Mohr's Circle analysis do not apply. Mohr's Circle under predicts the actual web stresses in these areas.
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