Numerical simulation of concrete encased steel composite columns

摘要: Abstract This paper investigates the behaviour of pin-ended axially loaded concrete encased steel composite columns. A nonlinear 3-D finite element model was developed to analyse inelastic steel, concrete, longitudinal and transverse reinforcement bars as well effect confinement The interface between section bars, were also considered that allowed bond be modeled different components retain their profile during deformation column. Furthermore, initial overall (out-of-straightness) geometric imperfection carefully incorporated in model. has been validated against published experimental results. main objective study understand structural response modes failure columns assess column strengths current design codes. covered slender, non-slender, stub long varied from normal high strength (20–110 MPa). yield stresses (275–690 variables influence comprising slenderness ratios, stress investigated a parametric study. It is shown increase small on for having higher relative ratios due flexural buckling mode. obtained analysis compared with calculated using American Institute Steel Construction AISC Eurocode 4 Generally, it EC accurately predicted cylinder 30 MPa 275 460 MPa, which are limits code, otherwise, generally conservative. predictions quite conservative all