Study of Pretensioned High Strength Concrete Girders in Composite Highway Bridges. Laboratory Tests

摘要

Due to the lack of data in the literature on composite bridge construction with high strength concrete pretensioned girders, two test programs were developed to provide data that would allow evaluation of the use of high strength concrete in the design of pretensioned bridge girders. The first series was a limited comparison of transfer characteristics of 0.5-in.-diameter strand in normal and high strength concrete. These tests provided data to evaluate whether current transfer length provisions found in the codes could be applied to high strength concrete members. The second series involved testing of scale-model high strength concrete pretensioned girders with a normal strength composite deck, representative of actual long-span bridge designs. Tests of two one-third scale girder specimens provided data for the evaluation of current design provisions and for verification of analysis techniques, and permitted development of recommendations where revision of the codes was necessary as covered in subsequent reports.