United States Department of Transportation
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Software for AASHTO LRFD combined shear and torsion computations using modified compression field theory and 3D truss analogy.
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2011-10-01
[PDF-3.21 MB]
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Edition:Final report; Jan. 2008-Sept. 2010.
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Abstract:The shear provisions of the AASHTO LRFD Bridge Design Specifications (2008), as well as the simplified
AASHTO procedure for prestressed and non-prestressed reinforced concrete members were investigated and compared
to their equivalent ACI 318-08 provisions. Response-2000 is an analytical tool developed for shear force-bending
moment interaction based on the Modified Compression Field Theory (MCFT). This tool was first validated against
the existing experimental data and then used to generate results for cases where no experimental data was available.
Several reinforced and prestressed concrete beams, either simply supported or continuous were examined to evaluate
the AASHTO and ACI shear design provisions for shear-critical beams.
In addition, the AASHTO LRFD provisions for combined shear and torsion were investigated and their accuracy
was validated against the available experimental data. These provisions were also compared to their equivalent ACI
code requirements. The latest design procedures in both codes can be extended to derive exact shear-torsion interaction
equations that can directly be compared to the experimental results by considering all φ factors as one. In this
comprehensive study, different over-reinforced, moderately-reinforced, and under-reinforced sections with highstrength
and normal-strength concrete for both solid and hollow sections were analyzed.
The main objectives of this study were to evaluate the shear and the shear-torsion procedures proposed by
AASHTO LRFD (2008) and ACI 318-08, validate the code procedures against the experimental results by mapping
the experimental limit points on the code-based exact ultimate interaction diagrams, and also develop a MathCAD
program as a design tool for sections subjected to shear or combined shear and torsion effects.
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