As part of a project at the University of Minnesota to investigate the application of high-strength concrete in prestressed
girders, four shear tests were performed on high-strength concrete prestressed girders.
Originally constructed in August 1993, the girders, Minnesota Department of Transportation (Mn/DOT) 45M sections
were 45 inches deep. Each girder utilized 46 0.6-inch diameter prestressing strands on 2-inch centers. The girders were
designed assuming a 28-day compressive strength of 10,500 psi. Later, a 4-foot-wide and 9-inch-thick composite
concrete deck was added to each girder using unshored construction techniques.
The shear test results were compared with predicted results from ACI 318-95 Simplified Method, ACI 318-95 Detailed
Method (AASHTO 1989), Modified ACI 318-95 Procedure, Modified Compression Field Theory (AASHTO LRFD
1994), Modified Truss Theory, Truss Theory, Horizontal Shear Design (AASHTO 1989), and Shear Friction
(AASHTO LRFD 1994). The calculated shear capacities were in all cases conservative compared to the actual shear
Cumming, David A.; French, Catherine E.; Shield, Carol K..
Shear Capacity of High-Strength Concrete Prestressed Girders.
Minnesota Department of Transportation.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.