DISCUSSION OF "MEASUREMENTS OF THERMAL GRADIENTS AND THEIR EFFECTS ON SEGMENTAL CONCRETE BRIDGE" BY CARIN L. ROBERTS-WOLLMAN, JOHN E. BREEN, AND JASON CAWRSE

A discussion of a paper with the aforementioned title, published in this journal (Volume 7, No. 3, May/June 2002) is presented. The discussers make several observations about the original paper. The discussers point out that the profiles for positive and negative gradients adopted by AASHTO have, in principle, been in use in the British Standards since 1978. The gradients used in the British Standard have been adopted in the Eurocode as a procedure to determine the effects of differential temperature through bridge cross sections. The discussers use the Eurocode equations to predict measured thermal gradients for a San Antonio Bridge. They express reservations about using the simplifications of nonlinear gradients to equivalent linear gradients to eliminate the need to address the self-equilibrating stresses. The discussers also question the simplification of the negative thermal gradient to eliminate the cooling of the bottom of the cross section. Concerns are raised about the comparison between the AASHTO code values and the measured figures, especially since it appears that surface temperatures and measured values from within the depth of the slab are compared.

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  • English

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  • Accession Number: 00961873
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 27 2003 12:00AM