Post-Tensioned Slab Bridge with Banded Transverse Tendons

A large, two-span 3/10 scale model of a post-tensioned slab bridge is constructed in a laboratory. The moderately thick slab rests directly on columns without bent caps. Dimensions of the slab are 16.9 x 5.33 x 0.229 m. In addition to uniformly distributed longitudinal posttensioning, a band of tendons is placed in a narrow region directly above the supporting columns. A large array of strain gages, linear variable differential transformers (LVDTs), and load cells serve to gather data. Response of the structure is monitored for dead, live, and prestressing loads. Both short- and long-term effects of these loads are of interest. Special attention is given to the distribution of strain in the slab due to transverse prestressing. AASHTO lane loads are applied statically. Shear lag at the edges of the banded region is considered. Complementary finite element analyses of the slab responses to loadings are also presented.