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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Shear-Flexure-Torsion Interaction Features of Reinforced Concrete Bridge Columns-An Experimental Study
Author(s): S.S. Prakash and A. Belarbi
Publication: Special Publication
Appears on pages(s): 427-454
Keywords: circular columns; combined loading; damage index; performance-based design; square columns; torsion.
Abstract:Reinforced concrete (RC) bridge columns are subjected to combined flexural, axial, shear, and torsional loading during earthquake excitations. This combination of loading can result in complex flexural and shear failure. The work presented herein included an experimental study conducted to understand the behavior of RC circular columns under combined loading. The main variables considered are the ratio of torsion to bending moment, and the level of detailing for high and moderate seismicity (low or high spiral reinforcement ratio). This paper presents the results of tests on eight reinforced concrete columns subjected to cyclic bending shear, cyclic pure torsion, and various levels of combined cyclic bending and torsional moments. It discusses the effects of combined loading on the hysteretic lateral load-deformation response, torsional moment-twist response, reinforcement strain variations, and plastic hinge characteristics. It also includes diagrams of interaction between bending and torsional moment. In addition, the results of this study highlight the significance of proper detailing of transverse reinforcement and its effect on torsional resistance under combined loading. Test results demonstrate
that combined loading decreases both flexural and torsional capacity. Further, they show a significant improvement in the performance of columns with an increase in the spiral reinforcement ratio.
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