Abstract
An experimental study on the steel tube confined reinforced concrete (STCRC) column with binding bars under axial compression is conducted. The bearing capacity and failure modes are obtained. It can be known that the axial deformation of concrete occurred under compression. The core concrete is wrapped and constrained by the steel tube wall, and the steel tube wall is constrained by binding bars locally, so the local buckling shape of the wall between the binding bars is like wave shape. The 3D finite element model is also developed to analyze the behavior of this type of column under axial compression. Good agreement is shown between the test and predicted results in terms of the load‐deformation curves and ultimate strength. The parametric studies indicate that the spacing of binding bars, diameter of longitudinal bars, concrete strength, thickness of the steel tube wall, and section dimension of the column generate different influence on the mechanical properties and bearing capacity. The diameter of longitudinal bars, concrete strength, and section dimension of the column have a great effect on the ultimate bearing capacity. The numerical results also show that the spacing of binding bars has little effect on the ultimate bearing capacity. The larger thickness of the steel tube wall leads to adverse effect on the specimen performance. Finally, the theoretical calculation is carried out, and the result is good.
Highlights
Due to the shortcomings of concrete-filled steel tubular (CFST) columns which have poor binding effect on core concrete leading to low bearing capacity and poor ductility, some improved methods on CFST columns have been investigated by scholars.Ge and Usami [1] reported the experimental results of square CFST columns with and without longitudinal stiffeners under concentric compressive load studied on the strength and deformation of specimens
Huang et al [2, 3] presented the axial load behavior of CFST columns of square section stiffened with steel reinforcing ties forming an octagonal shape; the construction is difficult, and the quality is not easy to guarantee for the columns
Ding et al [4, 5] discussed the mechanical performances of roundended CFST columns which may be used as bridge piers under axial loading by experimental study and finite element analysis. e influences of width-thickness ratio, concrete strength, steel yield strength, and wall thickness of the steel tube on the ultimate bearing capacity of the CFST columns were studied
Summary
Due to the shortcomings of concrete-filled steel tubular (CFST) columns which have poor binding effect on core concrete leading to low bearing capacity and poor ductility, some improved methods on CFST columns have been investigated by scholars. In order to further improve the confined effect of the steel tube on concrete, CFST with binding bars and steel tube confined reinforced concrete (STCRC) columns have been put forward by some scholars. Cai and He [7, 8] proposed a constitutive relationship for square CFST columns with binding bars, and a calculation of complete load-stress relationship curves was conducted for some certain experimental specimens using this constitutive relationship. Zhou et al [16, 17] investigated the mechanical performances of square STCRC short columns by test and reported the axial load behavior of circular section STCRC columns with different length-to-diameter ratios. The test study, the finite element analysis, and theoretical calculation on this kind of component are carried out under axial compression in order to provide the reference for the engineering design
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