Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4976162 | Journal of the Franklin Institute | 2011 | 14 Pages |
Abstract
The analysis of circular concrete columns using unconfined concrete models is a well established practice. However, there is a necessity to develop realistic analysis and design tools that predict the extreme ultimate capacity of such columns since modern codes and standards like AASHTO LRFD are introducing extreme load events. The increase in strength and ductility due to full axial confinement is not applicable to pure bending and bending plus axial load simply because the area of effective confined concrete is reduced. The higher the eccentricity the smaller the compressed portion of the confined core. Accordingly, the ultimate confined strength is gradually reduced from the fully confined value fccâ² (at zero eccentricity) to the unconfined value fcâ² (at infinite eccentricity) as a function of eccentricity to diameter ratio. A numerical analysis algorithm is developed using the finite layer procedure and the secant stiffness approach within a framework of incremental-iterative moment of area computations. The resulting nonlinear section analysis requires radial loading in which the eccentricity is kept constant or the axial load is proportional to the applied moment. The results are compared with existing experimental data and the widely used Mander model to benchmark the present predictions.
Related Topics
Physical Sciences and Engineering
Computer Science
Signal Processing
Authors
Ahmed Abd El-Fattah, Hayder A. Rasheed, Asad Esmaeily,