Analysis on Eccentric Compressive Behavior of Circular Concrete-encased Concrete Filled Double Skin Steel Tube Long Columns
In order to study the eccentric compression behavior of circular concrete-encased concrete filled double skin steel tube long columns and propose the calculation methods of carrying capacity,the parameters such as the slenderness ratio,eccentricity ratio,concrete strength,longitudinal rebars ratio and diameter of outer steel tube will be considered in this paper,and the corresponding finite element models are established by ABAQUS.Then investigate the effects of different parameters on load-deflection curves and load-moment curves and analyze the working mechanism of typical model.Finally,the calculation methods of components under eccentric compression are given based on the superposition theory.The whole loading process of circular concrete-encased concrete filled double skin steel tube long columns under eccentric compression can be divided into three stages:elastic,elastoplastic and plastic.The slenderness ratio and eccentricity ratio are the main factors which influence the carrying capacity of components,when the slenderness ratio increases from 40 to 50 and 60,the carrying capacity decreases by 9.4％and 18.9％,respectively;when the eccentricity ratio increases from 0.2 to 0.4 and 0.6,the carrying capacity decreases by 31.0％and 50.3％,respectively.The results obtained from eccentric bearing capacity calculation methods are in good agreement with the finite element simulation results.The study indicates that circular concrete-encased concrete filled double skin steel tube long columns have certain carrying capacity and ductility under the condition of lightening its own weight,and the eccentric compression behavior is good.
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