An Innovative Approach for Vertically Segmented Bridges: Extending Precast Concrete I-Girder Spans

摘要

align="left">This paper provides the results of research on the feasibility of field splicing a haunch block beneath a standard I-girder shape to form a haunched pier segment. The pier segment can be transported on? roads without violating vertical clearance requirements. The theory of interface (horizontal) shear capacity between the haunch block and the standard I-girder was verified using three types of specimens:? hear push-off specimens, connector pullout specimens, and a flexural (beam) specimen representing the pier segment of a continuous- span bridge. Reinforcement details of the haunch block, he I-girder, and the connection between them were evaluated for cost-effectiveness. A full-scale pier segment was fabricated by a precast concrete producer to investigate production and handling issues. Research confirmed the potential advantages of this novel system for I-girder spans up to 350 ft (107 m). The design guidelines provided in this paper may apply to cases in which it is more economical to connect a standard precast concrete I-girder with a cast-in-place concrete haunch - a case similar to the recently completed, value-engineered Clarks Bridge in Clarks, Neb.