NUMERICAL INVESTIGATION ON COMPRESSIVE STRENGTH OF COLUMNS WITH ELLIPTIC HOLLOW CROSS-SECTION
Adel Abdullah Mohammed Musleh;
Abstract
Summary:
Compressive Strength of columns composed of elliptic hollow cross section, EHS, is not covered in current codes. The purpose of this research is to investigate numerically the effect of geometric and material properties of EHS on its compressive strength using the finite element method. A three dimensional finite element model was established using ANSYS software incorporating both material and geometric nonlinearities. The numerical model was verified by comparison to experimental and numerical research published in literature. The numerical model was used to conduct extensive parametric analysis to assess the effect of geometric and material properties on compressive strength and to explore the slenderness limit distinguishing elastic and inelastic buckling. Numerical results of more than three hundred models revealed that current design equations adopted by AISC-360-10 for circular hollow sections were not suitable to predict the compressive strength of EHS especially in the inelastic buckling range. A slenderness correction factor was established for non-slender EHS and a stress reduction factor was established for slender EHS based on numerical results. The application of the proposed slenderness correction factor and stress reduction factor in the AISC360-10 design formula provided compatible results with numerical results obtained herein for slender EHS. The proposed compressive strength formula was also validated by comparison to numerical results that were not included in parametric analysis.
Compressive Strength of columns composed of elliptic hollow cross section, EHS, is not covered in current codes. The purpose of this research is to investigate numerically the effect of geometric and material properties of EHS on its compressive strength using the finite element method. A three dimensional finite element model was established using ANSYS software incorporating both material and geometric nonlinearities. The numerical model was verified by comparison to experimental and numerical research published in literature. The numerical model was used to conduct extensive parametric analysis to assess the effect of geometric and material properties on compressive strength and to explore the slenderness limit distinguishing elastic and inelastic buckling. Numerical results of more than three hundred models revealed that current design equations adopted by AISC-360-10 for circular hollow sections were not suitable to predict the compressive strength of EHS especially in the inelastic buckling range. A slenderness correction factor was established for non-slender EHS and a stress reduction factor was established for slender EHS based on numerical results. The application of the proposed slenderness correction factor and stress reduction factor in the AISC360-10 design formula provided compatible results with numerical results obtained herein for slender EHS. The proposed compressive strength formula was also validated by comparison to numerical results that were not included in parametric analysis.
Other data
| Title | NUMERICAL INVESTIGATION ON COMPRESSIVE STRENGTH OF COLUMNS WITH ELLIPTIC HOLLOW CROSS-SECTION | Authors | Adel Abdullah Mohammed Musleh | Issue Date | 2018 |
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