o The temporary concrete compressive stresses from transfer of prestress to casting of the bridge deck, including shipping and erection of precast girders shall be limited to 0.65f’ci (at transfer and handling in the casting yard) and 0.65f’c (shipping and erection on the jobsite) for all precast prestressed members. Table 5.2.3-1 of Bridge Design Manual will be updated to reflect this change.
The PGSuper program, Bridge Design Manual, and standard drawings are being modified to incorporate these revisions.
The wide flange prestressed girders apply to all designs and projects. However, the suitability of long span girders for shipping and handling should be evaluated on a job-by-job basis.
The following information on shipping weight is provided by the trucking company.
The shipping weight limits shown above are for a single girder segment and do not include the weight of the hauler. These limits are conservative and are set low to ensure that all girders can be trucked to all jobsites. Girders of 270+ kips could be shipped to some specific projects such as the Alaskan Way Viaduct or Puyallup River Bridge.
All of the research done to date, including a recent project at the University of Texas at Austin (Ozzie Bayrak), indicates that the use of 0.65f’ci (at transfer and handling in the casting yard) and 0.65f’c (shipping and erection on the jobsite) is fine across the board.
cc: Mohammad Sheikhizadeh, Bridge Construction - 47354
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