|TO:||All Design Section Staff|
|FROM:||J. Kapur - 47340|
|DATE:||December 4, 2001|
|SUBJECT:||Long Span Prestressed Girders|
· All prestressed girders with shipping weight less than 155 kips (144 ft for
W83G and 134 ft for W95G) shall be pre-tensioned only (no alternative design).
All prestressed girders with shipping weight between 156 and 200
kips shall include both pre-tensioned
and post-tensioned spliced-girder alternatives with post-tensioning applied after slab casting.
· All prestressed girders with shipping weight exceeding 200 kips shall be post-tensioned spliced-girder with post-tensioning applied after slab casting.
spliced-girder alternative is considered in the contract plans, the substructure
shall be designed and detailed for the maximum force effect
case only (no alternative design for substructure).
Standard plans for post-tensioned spliced-girders are now available in M:\BRIDGELIB\Master6\Standards\Girders\PT Wide Flange and will be soon published in the BDM.
Difficulties in fabrication, shipping and erection of long span prestressed girders may results in higher cost than typically expected for prestressed girders. Providing spliced-
girder alternative allows fabricating, shipping and erecting girders in smaller segments, feasible for remote locations.
If you have any questions, please contact Gary Battin at 705-7188 for standard plans and Bijan Khaleghi at 705-7181 for other issues.
cc: J. Weigel, 47340
F. Higgins, 47340