This paper discusses the effects of thermal gradients and creep redistribution, studies various retrofit procedures, and makes recommendations for the strengthening of concrete box girder bridges. It is noted that the secondary moments due to thermal gradients or creep redistribution can be balanced by internal prestressing (tendons inside the box that are anchored at the abutment diahragms and pass freely through the pier diaphragms) or external prestressing (jacking the bearings upward). It is noted that tendons should be at the top (just below the upper kern point) to conteract these secondary moments. These and other observations are discussed.

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  • Accession Number: 00497568
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Sep 30 1990 12:00AM