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.