Plastic behaviour of eccentricity loaded H-Profile columns

Abstract

Buckling behavior can be described as the abrupt bending of the structural elements under an axial stress load. As it's known, Columns are mostly slender structural elements that can fail due to instability when overloaded. Euler's formula is the failure of the column due to the compression caused by the stresses due to a lateral bending only. This assumption is valid for long columns only, the failures that occur in short and medium length columns result from a combination of direct compression and bending.

Columns under eccentricity compression mostly conduct an elastic buckling behavior, which is adopted in most international codes. Multiple studies have proved early that plastic reserve can be stimulated before buckling collapse occurs in the eccentricity compressed columns.

In the context of this study, the interaction equations of the columns in the case of eccentricity compression were adapted to produce charts that cover a wide range of work area for the relationship of capacity with the degree of eccentricity. The relationships of stability related to eccentricity  were concluded by linking the degree of eccentricity  with slenderness .

The proposed charts were tested on a column with a profile section H, it shows that there is a possibility to gain plastic behavior by knowing the points of intersection of the slenderness with the force interaction chart, and thus enable an ideal design for the column under eccentric pressure that motivate plastic behavior.

Stimulating plastic behavior in eccentric pressure column is a vital issue for structures, as it prevents sudden collapses and gives a good response during seismic loads.