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Computers and Concrete
  Volume 10, Number 4, October 2012, pages 331-347

Software for adaptable eccentric analysis of confined concrete circular columns
Hayder A. Rasheed, Ahmed M. Abd El-Fattah, Asad Esmaeily, John P. Jones and Kenneth F. Hurst

    This paper describes the varying material model, the analysis method and the software development for reinforced concrete circular columns confined by spiral or hoop transverse steel reinforcement and subjected to eccentric loading. The widely used Mander model of concentric loading is adapted here to eccentric loading by developing an auto-adjustable stress-strain curve based on the eccentricity of the axial load or the size of the compression zone to generate more accurate interaction diagrams. The prediction of the ultimate unconfined capacity is straight forward. On the other hand, the prediction of the actual ultimate capacity of confined concrete columns requires specialized nonlinear analysis. This nonlinear procedure is programmed using C-Sharp to build efficient software that can be used for design, analysis, extreme event evaluation and forensic engineering. The software is equipped with an elegant graphics interface that assimilates input data, detail drawings, capacity diagrams and demand point mapping in a single sheet. Options for preliminary design, section and reinforcement selection are seamlessly integrated as well. Improvements to KDOT Bridge Design Manual using this software with reference to AASHTO LRFD are made.
Key Words
    confined analysis; circular columns; eccentric loading; adjustable constitutive model; extreme events.
Hayder A. Rasheed and Asad Esmaeily: Structural Engineering, Analysis and Mechanics Lab., Kansas State University, USA; Ahmed M. Abd El-Fattah: Dept. of Architecture, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia; John P. Jones and Kenneth F. Hurst: Bridge Design Office, Bureau of Design, Kansas Department of Transportation, USA

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