Modification / expansion of existing structures

16th Street Bridge over I-465, Indianapolis, USA

Two new merging lanes were to be added to the highway under the existing bridge. Since the bridge was only ten years old and in excellent condition, it was decided to modify the structure by removing the end pier next to the south-bound lanes and replace it with a cable stayed support system.

For this complex modification project, a number of DYWIDAG Systems were used. The new 2 m wide transfer girder was prestressed with Ø32 mm DYWIDAG Bar Tendons (THREADBAR ^® ).

Vertical prestressing of the deadman pier shafts was executed with Ø36 mm DYWIDAG Bar Tendons (THREADBAR ^® ) placed within a void to allow for longitudinal movements.

To anchor the footings of the deadman piers against uplift forces of the stay cables, Ø36 mm DCP DYWIDAG Ground Anchors were used. The stay cables consisted of eight Ø36 mm DYWIDAG Bars (THREADBAR ^® ) inside individual steel pipes, which were cement grouted after stressing.