Field and Analytical Studies of the First Folded-Plate Girder Bridge

Abstract

AbstractAn innovative bridge that includes prefabricated folded-plate girders (FPGs), precast-posttensioned lower sections of the integral abutments, and a precast T-wall gravity wingwall system is studied. Some results are specific to the girder system, but others can be generalized to single-span integral-abutment bridges and to the durability of prefabricated elements. Data were collected during construction, static live-load testing, and long-term monitoring and were compared to finite-element modeling. Stresses in concrete and steel components remained low throughout construction, long-term data collection, and truck-load testing. Live-load test data indicate that the elastic neutral axis of the FPG is higher than that calculated and that positive shear lag (nonuniform girder flange stress) is observed under localized point loads. Limiting the movement of the wingwall and directing attention to the curing of cast-in-place elements would further improve the quality of future bridges. Observations on t...