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采用ABAQUS软件,在合理选用材料本构模型的基础上,对18个偏压中长柱进行全过程分析,考察长细比、偏心率、钢材屈服强度等因素对构件极限承载力及荷载-跨中挠度曲线的影响。分析结果表明:构件荷载-跨中挠度曲线可分为弹性阶段、弹塑性阶段、下降段和平缓段4个阶段。长细比、偏心率和含钢率对构件力学性能影响较大,随着长细比和偏心率的增加,构件的极限承载力迅速下降;增加含钢率可以提高构件的极限承载力;增加混凝土强度可以提高构件的极限承载力,但延性有所降低;随着钢材屈服强度的提高,构件极限承载力提高,但荷载-跨中挠度曲线的弹性阶段几乎不变。
Using ABAQUS software, based on the rational selection of material constitutive model, the full-course analysis of 18 long columns with eccentric columns was carried out. The effects of slenderness ratio, eccentricity and yield strength of steel on the ultimate bearing capacity and load- Middle Deflection Curve. The analysis results show that the load-span mid-span deflection curves can be divided into four stages: elastic stage, elastoplastic stage, descending stage and smooth section. The slenderness ratio, eccentricity and steel content have a great influence on the mechanical properties of the component. The ultimate bearing capacity of the component decreases rapidly with the increase of the slenderness ratio and the eccentricity. The increase of the steel content can increase the ultimate bearing capacity of the component. The strength of concrete can improve the ultimate bearing capacity of the members, but the ductility decreases. With the increase of the yield strength of steel, the ultimate bearing capacity of the members increases, but the elastic stage of the load-span mid-deflection curve hardly changes.