Idaho’s ABC Multi-Span Bridge over Snake River Replacement Project

September 16, 2021 1:00 pm

Matt Farrar, P.E., State Bridge Engineer, Idaho Transportation Department; and Shane Brown, P.E., S.E., Senior Engineer, Parametrix, Inc.

Webinar Recording (to be posted soon!)

Webinar Documents:
Idaho’s ABC Multi-Span Bridge over Snake River Replacement Project - pdf of presentation
Slide 23: TechNote: Design and Construction of Field-Cast UHPC Connections, FHWA, 2014
[Update:TechNote: Design and Construction of Field-Cast UHPC Connections, FHWA, 2019]
Q&A Session - pdf (to be posted soon!)
News - September 16, 2021 - pdf of presentation

Description: The SH 51 Bridge over the environmentally sensitive Snake River in Idaho was a deteriorating 19-span, 615-foot-long precast concrete stringer bridge in need of replacement. Challenges for the replacement project included minimizing environmental impacts to the Snake River, maintaining traffic flow during construction, and replacing the bridge in a single year. In 2018 the bridge was replaced on the same horizontal alignment in two stages to maintain one lane of traffic during construction. Additional solutions to address the challenges included maximizing the span lengths to reduce the number of in-water piers, constructing the steel-pile-bent piers without the use of cofferdams, and utilizing prestressed deck bulb tee girders with ultra-high-performance concrete (UHPC) keyways. The presentation focuses on the design and construction of the superstructure with UHPC keyways and the pile-bent substructure, and will include lessons learned.

Presenters:

  

Matt Farrar, P.E.
State Bridge Engineer
Idaho Transportation Department
Email: Matt.Farrar@itd.idaho.gov

 

Shane Brown, P.E., S.E.
Senior Engineer
Parametrix, Inc.
Email: SBrown@parametrix.com

Presentation Photos/Graphics:

1) Stage 1 pile driving

2) Girder erection

3) UHPC keyway preparation

4) Completed bridge