Eccentrically loaded concrete encased steel composite columns

摘要: Abstract This paper presents a nonlinear 3-D finite element model for eccentrically loaded concrete encased steel composite columns. The columns were pin-ended subjected to an eccentric load acting along the major axis, with eccentricity varied from 0.125 0.375 of overall depth ( D ) column sections. accounted inelastic behaviour steel, concrete, longitudinal and transverse reinforcement bars as well effect confinement interface between section bars, also considered allowing bond be modelled different components retain its profile during deformation column. initial geometric imperfection was carefully incorporated in model. has been validated against existing test results. strengths normal high strength (30–110 MPa). yield stresses (275–690 MPa). Furthermore, variables that influence comprising eccentricities, dimensions, structural sizes, strengths, investigated parametric study. Generally, it is shown on owing increase stress significant small . On other hand, higher , due lower than 70 MPa. obtained analysis compared design calculated using Eurocode 4 EC4 accurately predicted columns, while overestimated moment.