United States Department of Transportation
i
Strength and stiffness of reinforced rectangular columns under biaxially eccentric thrust.
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1976-01-01
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Abstract:Compression tests on nine reinforced concrete rectangular columns subjected to
constant thrust and biaxially eccentric moments were conducted at the off-campus
research facility of The University of Texas, The Civil Engineering Structures
Laboratory at Balcones Research Center.
The complex nature of biaxially eccentric thrust and biaxially eccentric
deformation is discussed briefly. It is the purpose of thiS study to report the
results of tests performed on the 5 in. x 9 in. rectangular columns. Load measurements,
lateral displacements, and longitudinal deformations were monitored through
the middle 30 in. length of the 72 in. long specimens.
All columns were reinforced identically with a reinforcement ratio equal
to 0.011. The flexural strength of cross sections could be predicted adequately by
an elliptical function of ratios between biaxial moment components and uniaxial
moment capacities. The ACI recommendation that for skew bending, each component of
moment should be magnified according to the stiffness about each principal axis of
bending appeared to be a reliable technique only for thrust levels above 40 percent
of the short column strength.
This report is the first interim report on Project 3-5-73-7 (Federal No.
HPR-l(14ยป, ''Design Parameters for Columns in Bridge Bents.1t
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