NON-LINEAR SECTIONAL ANALYSIS OF CONCRETE ENCASED STEEL STUB COLUMN SUBJECTED TO AXIAL LOAD

Abstract

: This paper presents a numerical parametric study of Concrete Encased Steel Column (CESC) due to centrically and eccentrically axial load. To model the confining pressure of rebar and steel profile, modified Mander’s equations were used. The non-linear sectional analysis was performed using the fiber-based method. The CESC section was discretized using Netgen 2D meshing algorithm. The developed CESC model was validated using the available test results in the literature. After the model was validated, parametric studies were conducted to investigate the behaviors of CESC with different concrete compression strength, confinement bar diameter, and confining distance. The parametric studies found that the columns with higher concrete compression strength tend to have higher axial and flexural capacity but reduce the overall ductility. Increasing the confinement bar diameter slightly increases the axial and flexural capacity and ductility. On the other hand, utilizing tighter confinement space resulted in higher ductility but with insignificant increase in axial and flexural capacity.