Abstract
In order to investigate the bearing capacity of H‐shaped honeycombed steel web composite columns with rectangular concrete‐filled steel tube flanges (STHCCs) subjected to eccentrical compression load, 33 full‐scale STHCCs were designed with the eccentricity(e), the slenderness ratio (λ), the cubic compressive strength of concrete(fcuk), the thickness of the steel tube flange (t1), the thickness of honeycombed steel web (t2), diameter‐depth ratio (d/hw), space‐depth (s/hw), and the yield strength of the steel tube (fy) as the main parameters. Considering the nonlinear constitutive model of concrete and simplified constitutive model of steel, the finite element (FE) model of STHCCs was established by ABAQUS software. By comparison with the existing test results, the rationality of the constitutive model of materials and FE modeling was verified. The numerical simulation of 33 full‐scale STHCCs was conducted, and the influence of different parameters on the ultimate eccentrical compression bearing capacity was discussed. The results show that the cross‐sectional stress distribution basically conforms to the plane‐section assumption. With the increase in e, λ, and d/hw, the ultimate eccentrical compression bearing capacity of the full‐scale STHCCs decreases, whereas it gradually increases with the increase in fcuk, t1, t2, s/hw, and fy. By introducing bias‐stress stability coefficient (φ), the calculation formula of full‐scale STHCCs under eccentrical compression is proposed by statistical regression, which can lay a foundation for the popularization and application of these types of composite columns in practical engineering.
Highlights
H-shaped honeycombed steel web composite columns with rectangular concrete-filled steel tube flanges (STHCCs) are types of novel composite members formed by connecting two concrete-filled rectangular steel tubular flanges with a honeycombed steel web. e core concrete can prevent and delay the local buckling of the steel tube and the instability failure of the specimens effectively, and on the other hand, the confinement of the steel tube makes the core concrete in a state of triaxial compression, which can effectively improve the capacity of resisting deformation and the compressive strength of the core concrete
Li et al [6] conducted eccentrical compression tests of L-shaped square concrete-filled steel tube (CFST) columns and established a finite element (FE) model to study the eccentrical compression behavior of this type column and proposed a bearing capacity analysis method of the rectangular concrete-filled stainless steel tubular (CFSST) columns based on the stress yield criterion at the edge of the section base
Twenty-one recycled self-compacting concrete-filled circular steel tubular (RSCFCST) columns were tested subjected to eccentric compression by Yu et al [10], and bearing capacity of these kinds of composite columns under eccentric compression was obtained systemically; an analytical model for predicting the effective stiffness of RSCFCST columns under eccentric compression was proposed based on the moment magnifier method
Summary
H-shaped honeycombed steel web composite columns with rectangular concrete-filled steel tube flanges (STHCCs) are types of novel composite members formed by connecting two concrete-filled rectangular steel tubular flanges with a honeycombed steel web. e core concrete can prevent and delay the local buckling of the steel tube and the instability failure of the specimens effectively, and on the other hand, the confinement of the steel tube makes the core concrete in a state of triaxial compression, which can effectively improve the capacity of resisting deformation and the compressive strength of the core concrete. Li et al [6] conducted eccentrical compression tests of L-shaped square CFST columns and established a finite element (FE) model to study the eccentrical compression behavior of this type column and proposed a bearing capacity analysis method of the rectangular concrete-filled stainless steel tubular (CFSST) columns based on the stress yield criterion at the edge of the section base. Rong et al [7] analyzed the eccentrical compression behavior of concretefilled square steel tube columns with I-shaped CFRP through experimental research and FE simulation, and derived the calculation formula of eccentrical compression bearing capacity of composite columns. Chen et al [9] studied the influence regularity of different parameters on eccentrical compression test of 18 concrete-filled square steel tube columns with spiral stirrups and derived the calculation formula of eccentrical compression bearing capacity of these types of columns. Based on the existing axial compression test and results of reduced-scale eccentrical compression behavior of STHCCs, the numerical simulation analysis of 33 full-scale STHCCs is further carried out by ABAQUS software. e influence of different parameters on the ultimate bearing capacity of these types of full-scale composite columns under eccentrical compression is discussed. e calculation formula of eccentrical compression bearing capacity of these types of columns can be obtained by statistical regression based on the simulation results, which can provide technical support for the subsequent research and application of these types of columns
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