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Evaluation of Performance of A709 Grade QST 65 Steel

Project Details
STATUS

In-Progress

PROJECT NUMBER

19-717, TR-779

START DATE

07/15/19

END DATE

03/31/22

FOCUS AREAS

Infrastructure

RESEARCH CENTERS InTrans, BEC
SPONSORS

Iowa Department of Transportation
Iowa Highway Research Board

Researchers
Principal Investigator
Justin Dahlberg

Research Engineer, BEC

Co-Principal Investigator
Brent Phares

Bridge Research Engineer, BEC

About the research

A709 Grade QST 65 Steel has been recently introduced to the Standard Specification for Structural Steel for Bridges. Its strength characteristics and ductility meet or exceed those of more conventionally used steels (30% higher strength) for bridges leading to potential cost savings (3% higher cost). Testing of the material to assess the ability to meet the design provisions set forth by the American Association of State Highway and Transportation Officials is needed to further the case for regular adoption into bridge construction projects. Laboratory testing of this steel in composite action with a concrete deck and fatigue testing will be performed as part of this project. Additionally, live load testing of a newly constructed bridge in Buchanan County, Iowa, using this steel will be completed.

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