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Not in the Spec?
Posted by Geoff Weisenberger on October 1, 2007 at 9:17 AM.

The article “Above-Grade, Below Estimate” (March, p. 55) describes a project in which hybrid girders have been used in a horizontally curved bridge. However, the AASHTO Guide Specifications for Horizontally Curved Steel Girder Bridges does not provide for hybrid girders, probably due to lack of related research.

 

Apparently, this hybrid bridge has been designed as a conventional bridge on a curved alignment. In your opinion, is this an appropriate design?

 

Andreas Paraschos, P.E.

One Response to “Not in the Spec?”

  1. Geoff

    Mr. Paraschos is correct; that specification does not cover the use of hybrid steel girders. This code is written in conjunction with the old AASHTO standard specifications. Both of these are being sunsetted by the AASHTO code-writing committees in favor of LRFD design.

     

    The Gibson Road Viaduct was designed under the new AASHTO LRFD specifications. These specifications are written for both straight and curved hybrid girders.

     

    Matt Johnson, P.E., Senior Project Engineer, TranSystems

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