Post-Tensioned Slab Bridges on Isolated Supports

The results of an elastic model study of a post-tensioned three-span slab bridge are presented. The model is a 1/36-scale version of a typical straight slab bridge on isolated supports. Loading cases considered for the model included both gravity loading and longitudinal prestress. The in-plane and bending stresses resulting from these loading cases were obtained. The observed data were compared with a finite element analysis. Longitudinal moments are generally predictable using elementary beam theory. A two-dimensional finite element analysis is required for transverse moment prediction and support moment prediction. Close agreement was found between the observed and computed data.