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Abstract:For several years the Iowa Department of Transportation (DOT), Iowa State University, the Federal Highway Administration,
and several Iowa counties have been working to develop accelerated bridge construction (ABC) concepts, details, and processes.
Throughout this development, much has been learned and has resulted in Iowa being viewed as a national leader in the area of
ABC. However, at this time, the Office of Bridges and Structures does not have a complete set of working standards nor design
examples to accompany ABC portions of the bridge design manual (now called the Load and Resistance Factor Design/LRFD
Bridge Design Manual).
During the fall of 2013, the Iowa DOT constructed a bridge on IA 92 in Cass County using an ABC technique known as slide-in
bridge construction. During the design of the Cass County Bridge, several questions were raised about the performance of critical
design and construction details: the pile-to-pile cap connection and the polytetrafluoroethylene (PTFE) coated bearing pads on
which the bridge would slide.
The timing of this specific need and the initiation of this project offered a unique opportunity to provide significant short- and
long-term value to the Office of Bridges and Structures. Several full-scale laboratory tests, which included several variations of
the pile-to-pile cap connection and bearing pad slides, were completed. These tests proved that the connection was capable of
achieving the desired capacity and that the expected coefficient of friction of the bearing pads was reasonably low.
Finally, a design tool was developed for the Office of Bridges and Structures to be used on future projects that might benefit from
a precast pile cap.
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