I-69 Twin Bridges over Patoka River (IN)

JSE provided design services for these precast prestressed semi-lightweight concrete bulb-tee superstructure twin bridges over the Patoka River Floodplain and CR 150N in Pike & Gibson County, Indiana.  These bridges are located in seismic zone 2 which requires comprehensive seismic analysis to be performed on the substructures.

These precast prestressed bridges consist of a northbound structure with 30 spans and a southbound structure of 31 spans with a total length of each structure at approximately 4400 feet.  The superstructure consists of a concrete deck supported by 4 beamlines of 84” precast prestressed bulb-tee beams. The substructures consisted of frame piers with reinforced concrete cap supported on two 4.5’ diameter columns; each column is supported on a 6’ diameter drilled shaft as the foundation.

Utilizing semi-lightweight concrete beams, the bridges are able to span over 154ft-span with 84” tall beams and also reduce the seismic forces distributed to the substructures which reduce the construction and material cost.

Total Length: 2 structures at 4,400’ each

Number of spans: 7 units with 30 spans (NB) and 7 units with 31 spans (SB)

Main Span: Varies from 130’ to 154’

Width: 43’-4”