What specification does PGSuper follow to specify minimum debonding length?

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What specification does PGSuper follow to specify minimum debonding length?

What specification does PGSuper follow to specify minimum debonding length?

My project have slab girders spaning 32-34 feet. PGSuper calculates the maximum debonding length based on develoment length equation and also gives minimum debonding length of 3 feet. I can understand the maximum debonding length since AASHTO has development length requirement. However, for minimum debonding length, I cannot find any source from AASHTO or BDM. There is a 60db length from free end to effective prestress in AASHTO Figure C5.11.4.2-1, is this the source?

In my project, the maximum allowable debonding length is only 2'-8" for some cases, at the same time, the minimum debonding length specified in PGsuper is 3 feet. Can I sacrify either maximum or minimum length since I cannot satisfy them at the same time? Any advice?

Thanks
Jimmy

Pickings
Debonding requirements are

Debonding requirements are input on the Debonding Criteria tab in the library for the girder section in question. If I understand your question correctly, you will what to change the "Minimum distance between debond sections" value. In general, this value should be greater than the transfer length for the strand in question.

Richard Pickings, P.E.
BridgeSight Inc.

Jimmy Chen (not verified)
Thank you Richard. That

Thank you Richard. That answered my questions.

One more discussion here: is there any relationship between transfer length 60db(36 inch for 0.6 DIA strand) and minimum debonding length? or mandatory requirement for minimum debonding in AASHTO/BDM?

Pickings
 Good question. I don't see

 Good question. I don't see the requirement in AASHTO. TxDOT uses a value of 36", North Carolina 48", and Florida uses the depth of the section. WSDOT's BDM refers to debonding at 3', 6', 9' in several places, but I don't see a clear requirement.

Richard Pickings, P.E.
BridgeSight Inc.

Jimmy Chen (not verified)
Thank you for your quick

Thank you for your quick response and support.
Jimmy

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