United States Department of Transportation
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Kansas Department of Transportation column expert : ultimate shear capacity of circular columns using the simplified modified compression field theory.
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2015-09-01
[PDF-2.10 MB]
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Abstract:The importance of the analysis of circular columns to accurately predict their ultimate confined
capacity under shear-flexure-axial force interaction domain is recognized in light of the extreme load event
imposed by the current American Association of State Highway and Transportation Officials (AASHTO)
Load and Resistance Factor Design (LRFD) Bridge Construction Specifications (AASHTO, 2014). In this
study, various procedures for computing shear strength are reviewed. Then, the current procedure adopted by
AASHTO LRFD specifications, based on the Simplified Modified Compression Field Theory, is evaluated
for non-prestressed circular concrete bridge piers. This evaluation is benchmarked against experimental data
available in the literature, and against Response 2000 freeware program that depicts interaction diagrams
based on AASHTO (1999) LRFD requirements. Differences in results are discussed and future
improvements are proposed. A new approach is presented to improve the accuracy of AASHTO LRFD
calculations. The main parameters that control the cross section shear strength are discussed based on the
experimental results and comparisons.
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