Measurement-Based Performance Evaluation of a Segmental Concrete Bridge

Construction of around 10 km of the US 183 elevated highway in Austin, Texas, using precast segmental post-tensioned construction provided a unique opportunity to investigate many aspects of segmental bridge technology. The project included balanced cantilever erection, span-by-span erection and some cast-in-place transitions. Some of the piers were also made with precast box sections. A detailed instrumentation study was carried out to determine post-tensioning force losses, thermal gradients and their effects, live load response, behavior of local zones such as diaphragms p-t anchorages and blisters and diffusion of post-tensioning forces, measurement results are presented and evaluated. Recommendations are made for improvement in bridge design specifications and construction practices.