Structural Implication of Post-Tensioned Ducts in Prestressed Concrete Girders
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Prestressed concrete girders are used extensively to support bridge decks in highway bridges. The maximum length of a typical prestressed concrete girder is generally limited to what can be transported safely by trucks to the construction site – approximately 160 feet. With the use of post‐tensioned strands placed in ducts cast into the girders, multiple pretensioned concrete girders can be spliced together to form a continuous member along the length of a bridge, allowing greater structural continuity and more efficient use of materials. However, due to the location of the ducts in the relatively thin web regions of the girders, new failure modes can control the shear strength of the members. The structural implications of corrugated steel and plastic ducts cast in the web regions of spliced Tx‐Girders under the effects of compressive loading are studied in this report.