A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Iowa Department of Transportation (DOT) and other organizations have been developing accelerated bridge construction (ABC) concepts, details, and processes, and Iowa has come to be viewed as a national leader in the area of ABC. However, the Office of Bridges and Structures does not have a complete set of working standards nor design examples to accompany the ABC portions of the Iowa DOT Load and Resistance Factor Design (LRFD) Bridge Design Manual. In the fall of 2013, the Iowa DOT constructed a bridge on IA 92 near Massena, Iowa, using an ABC technique known as slide-in bridge construction. For this technique, the constructed superstructure is slid from a temporary position to the permanent position onto a newly constructed substructure. The method prescribed for the Massena Bridge used stainless steel sliding shoes on polytetrafluoroethylene (PTFE) topped neoprene bearing pads. The type of pile-to-pile cap connection intended for this bridge is constructed by placing a precast pile cap, complete with pile pockets formed using corrugated metal pipe (CMP), over the top of driven steel H-piles at their final location. The connection is then completed by placing concrete into the pile pockets to create a positive connection with the CMP. During the design of the Massena Bridge, questions arose about critical design and construction details: the pile-to-pile cap connection and the PTFE-topped bearing pads on which the bridge would slide. Investigating these questions offered an opportunity to provide significant value to the Iowa DOT Office of Bridges and Structures.
The Iowa Department of Transportation (DOT) and other organizations have been developing accelerated bridge construction (ABC) concepts, details, and processes, and Iowa has come to be viewed as a national leader in the area of ABC. However, the Office of Bridges and Structures does not have a complete set of working standards nor design examples to accompany the ABC portions of the Iowa DOT Load and Resistance Factor Design (LRFD) Bridge Design Manual. In the fall of 2013, the Iowa DOT constructed a bridge on IA 92 near Massena, Iowa, using an ABC technique known as slide-in bridge construction. For this technique, the constructed superstructure is slid from a temporary position to the permanent position onto a newly constructed substructure. The method prescribed for the Massena Bridge used stainless steel sliding shoes on polytetrafluoroethylene (PTFE) topped neoprene bearing pads. The type of pile-to-pile cap connection intended for this bridge is constructed by placing a precast pile cap, complete with pile pockets formed using corrugated metal pipe (CMP), over the top of driven steel H-piles at their final location. The connection is then completed by placing concrete into the pile pockets to create a positive connection with the CMP. During the design of the Massena Bridge, questions arose about critical design and construction details: the pile-to-pile cap connection and the PTFE-topped bearing pads on which the bridge would slide. Investigating these questions offered an opportunity to provide significant value to the Iowa DOT Office of Bridges and Structures.
Iowa ABC Connections. Tech Transfer Summary
Phares B. (author)
2015
2 pages
Report
No indication
English