Precast Post-tensioned Girder (Research Replica) Donated by Florida Department of Transportation Further Information A replica of an early post-tensioned concrete girder, donated by FDOT. Used in the research of the shear capacity of different types of bridge girders. Resources Hamilton, H.R., G. Llanos, and B.E. Ross. 2009. Shear Performance of Existing Prestressed Concrete Bridge Girders.