Experimentation with ABC Technology in South Carolina: S-770 Bridge over Hanging Rock Creek – Lancaster County

May 19, 2022 1:00 pm

Terry B. Koon, P.E., Structural Design Support Engineer, South Carolina Department of Transportation

Webinar Documents:
Experimentation with ABC Technology in South Carolina: S-770 Bridge over Hanging Rock Creek - Lancaster County - pdf of presentation
Q&A Session - pdf
News - May 19, 2022 - pdf of presentation

Description: South Carolina Department of Transportation (SCDOT) partnered with Clemson University to develop a prestressed concrete bridge superstructure type to provide a durable superstructure that can be used for accelerated bridge construction. The result was a modified NEXT-D Beam using UHPC to provide connections for the beams. In 2016, a bridge replacement project began construction that incorporated the modified NEXT-D Beam section. The superstructure consisted of one 40-ft modified NEXT-D Beam span, two traditional 70-ft prestressed concrete cored slab spans, and one 40-ft prestressed concrete solid slab span with modified shear keys. The closure pours and shear keys for all beams and slab units were connected with UHPC. The different superstructure types were used to compare the performance of each. This presentation includes design details, shows the construction process, discusses research findings, and provides some lessons learned from the project.

Presenter:

 

 

Terry B. Koon, P.E.
Structural Design Support Engineer
South Carolina Department of Transportation
Email: KoonTB@scdot.org

Terry graduated from the University of South Carolina in 1986 with a B.S. Degree in Civil Engineering and is registered as a Professional Engineer for the State of South Carolina. He began work with the South Carolina Department of Transportation (then South Carolina Department of Highways and Public Transportation) in 1982 as a part-time employee. He has spent 36 years with bridge design in various roles, including structural design, geotechnical design, and bridge replacement project management. He currently serves as the Structural Design Support Engineer tasked with managing the development of structural design policies and structural quality assurance reviews. He serves as the SCDOT voting member on the AASHTO Committee on Bridges and Structures (CBS) and also as a member on the CBS Technical Committee on Seismic (T-3).

Presentation Photos/Graphics:

1)  Modified NEXT-D casting bed, Tekna Corporation – Charleston, SC

2) Interior unit – modified NEXT-D beam

3) View of bridge looking south prior to closure pours and shear keys being filled with UHPC

4) Installation of UHPC in closure pours of modified NEXT-D beams

a) Side view

b) Looking south

5) Completed bridge