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Finite element analysis of concrete-filled steel tube (CFST) columns with circular sections under eccentric load

机译：圆形截面钢管混凝土柱的有限元分析

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摘要

The casting of concrete in concrete-filled steel tube (CFST) can, via the confinement effect of the steel tube, significantly increase the ductility of the concrete and, in the case of high-strength concrete (HSC), alleviate the shortfall in ductility of the HSC. This kind of structure is gaining popularity but its behaviour is quite complicated. In an axially loaded circular CFST column, the confinement is uniform and equi-biaxial (isotropic within the cross-section). But, when the circular CFST column is under eccentric load, the confinement becomes non-uniform and anisotropic. Such complicated confinement effect is not easy to analyse and for such analysis, a rigorous finite element (FE) method is generally needed. In this paper, a new FE model considering the lateral strain-axial strain relation of the confined concrete covering the full range from the initial elastic stage to the inelastic stage is developed for the analysis of circular CFST columns under eccentric load. The FE model is used to analyse a total of 95 CFST specimens tested by other researchers and the numerical results are compared to the published test results for verification. (C) 2017 Elsevier Ltd. All rights reserved.
机译：通过钢管的约束作用，在钢管混凝土中浇铸混凝土可以显着提高混凝土的延展性，在高强度混凝土（HSC）的情况下，可以缓解延展性的不足HSC。这种结构越来越流行，但是其行为却相当复杂。在轴向加载的圆形CFST圆柱中，约束是均匀且等双轴的（在截面内各向同性）。但是，当圆形CFST柱承受偏心载荷时，约束变得不均匀且各向异性。这种复杂的限制效果不易分析，对于这种分析，通常需要严格的有限元（FE）方法。本文针对圆形CFST柱在偏心荷载作用下的分析，建立了一种新的有限元模型，其考虑了从初始弹性阶段到非弹性阶段整个过程的承压混凝土的横向应变-轴向应变关系。有限元模型用于分析其他研究人员测试的总共95个CFST标本，并将数值结果与已发布的测试结果进行比较以进行验证。 （C）2017 Elsevier Ltd.保留所有权利。

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