碳纤维钢骨-钢管混凝土柱双向偏压有限元分析

Finite Element Analysis on CFRP Steel Reinforced Concrete Filled with Steel Tube Column under Bidirectional Eccentric Load

目的研究碳纤维钢骨—钢管混凝土柱在双向偏心荷载作用下的力学性能,为实体试验提供理论依据.方法利用有限元软件ABAQUS,通过选取单元类别、设定相互作用等一系列建模过程,建立了5种不同参数下的13个试件模型,通过软件分析得到双向偏心压弯试件的荷载-挠度曲线.结果随着偏心距的增加,试件的承载力与抗弯刚度均逐渐下降;随着碳纤维层数的增加,试件的承载力显著上升,但延性迅速下降;随着长细比的增加,试件的破坏形式由内部材料破坏逐渐变成整体失稳破坏,抗弯刚度与极限承载力均有所下降,但延性有所增加;随着缀板间距的减小,受约束混凝土的强度增大,试件的承载力也越高;随着加载角度的变化,试件的力学性能几乎保持不变.结论碳纤维钢骨-钢管混凝土柱在双向偏心荷载作用下具有良好的承载力与刚度,延性系数也符合抗震要求.

The purpose of this paper is to do research on mechanical behavior of CFRP steel reinforced concrete filled with steel tube column under bidirectional eccentric load,providing reference for the experiment.The finite element software ABAQUS is used to simulate thirteen different specimens by the procedures of selecting unit category,setting interaction and so on.We can get the load-deflection curves of specimens under bidirectional eccentric loads by the analysis of the software.According to the research of parameters in this paper,with the increasing of eccentricity,the bearing capacity and stiffness of the specimen decreases gradually.With the increasing of CFRP layers,the bearing capacity of the specimen rises significantly,but the ductility of specimen drops quickly.With the increasing of slenderness ratio,the failure mode of specimen changes from material damage form to overall instability damage form.At the same time,stiffness and the ultimate bearing capacity decreases slightly,but the ductility rises faintly.With the decreasing of the interval of batten plate,the strength of concrete increases,and the bearing capacity of the specimen becomes higher.When the load angle is changed,there is little effect on the mechanical behavior of the specimen.The bearing capacity and stiffness of the CFRP steel reinforced concrete filled with steel tube column is very well,and the ductility coefficient can comply with the seismic requirements.