Abstract
This study aims to investigate the hysteretic behavior of H-shaped honeycombed steel web composite columns with rectangular concrete-filled steel tube flanges (STHCCs). Taking the shear span ratio (λs), axial compression ratio (n), steel ratio of section (α), aspect ratio of section (D/B), yield strength of steel tube (fyfk), and compressive strength of concrete (fck) as the main parameters, we designed 22 full-scale STHCCs. By comparing the load-displacement curves between test and simulation, the rationality of finite element modeling method was verified. The quasi-static analysis of 22 specimens was carried out, and the influence regularity of different variables on the hysteretic behavior, skeleton curves, ductility, energy dissipation, resistance degradation, and stiffness degradation of STHCCs was obtained. The results show that the hysteresis curves of all the specimens show full shuttle shape and strong energy dissipation capacity. λs, α, and fyfk have great influence on the bearing capacity of skeleton curves. With the increase of α and fyfk, the initial stiffness of the specimens gradually increases. The stiffness degradation rate of the specimens gradually slows down, and the energy dissipation coefficient gradually decreases by increasing λs, α, and fyfk, but energy dissipation capacity is still at a high level. The resistance degradation of specimens increases gradually by increasing λs, α, fyfk, and D/B. The ductility of specimens gradually increases by increasing n, α, and fck. The maximum bulging deformation and maximum stress of specimens appear at the column foot. The trilinear skeleton curve model and restoring force model of STHCCs are established by statistical regression.
Highlights
STHCCs, short for H-shaped honeycombed steel web composite columns with rectangular concrete-filled steel tube flanges, are a kind of novel composite members formed by connecting two concrete-filled rectangular steel tube flanges with a honeycombed steel web. e core concrete can effectively prevent and delay the local buckling of the steel tube and the instability failure of the specimens; the steel tube has certain restraint action on the concrete, which results in Advances in Civil Engineering the core concrete under a state of triaxial compression; and the compressive strength and the ability to resist deformation of the core concrete can be significantly improved.Since the twentieth century, a lot of research has been carried out regarding concrete-filled steel tube (CFST) columns and honeycombed columns at home and abroad
Sakino et al [1] designed and fabricated 114 short CFST columns with different parameters of the shape of the steel tube, the tensile strength of the steel tube, the diameterthickness ratio of the steel tube, and the strength of the concrete, and a formula for the ultimate axial bearing capacity was proposed. e mechanical behavior of concretefilled double-layer circular steel tube columns was studied by Essopjee and Dundu [2]. e tests of 32 specimens subjected to axial compression were conducted, and the bearing capacity formula of concrete-filled double-layer circular steel tube columns was proposed
Low cyclic loading tests on recycled CFST columns and ordinary CFST columns were carried out by Chen et al [9] and Tang et al [10]. e influence of axial compression ratio, steel tube strength, steel tube thickness, and other parameters on the seismic behavior of CFST columns was discussed, and a fitting formula for skeleton curve based on Boltzmann mathematical model was proposed. e seismic capacity of 16 ultralarge high strength concrete-filled circular steel tube (HCFTST) columns under cyclic loading was analyzed by Wang et al [11], and a strength model to predict the bending moment bearing capacity was proposed
Summary
STHCCs, short for H-shaped honeycombed steel web composite columns with rectangular concrete-filled steel tube flanges, are a kind of novel composite members formed by connecting two concrete-filled rectangular steel tube flanges with a honeycombed steel web. e core concrete can effectively prevent and delay the local buckling of the steel tube and the instability failure of the specimens; the steel tube has certain restraint action on the concrete, which results in Advances in Civil Engineering the core concrete under a state of triaxial compression; and the compressive strength and the ability to resist deformation of the core concrete can be significantly improved. E tests of 32 specimens subjected to axial compression were conducted, and the bearing capacity formula of concrete-filled double-layer circular steel tube columns was proposed. In order to investigate the axial compression behavior of short STHCCs with different parameters, an experimental study of 16 short STHCCs was designed and carried out by Ji et al [5], and the calculation formula of the axial bearing capacity for this type of short column was established. E influence of axial compression ratio, steel tube strength, steel tube thickness, and other parameters on the seismic behavior of CFST columns was discussed, and a fitting formula for skeleton curve based on Boltzmann mathematical model was proposed. Based on the research results of axial compression test of STHCCs, the quasi-static analysis of 22 STHCCs under low cyclic loading is further carried out by ABAQUS software. e influence of different parameters on the hysteretic behavior, skeleton curve, ductility, energy dissipation capacity, resistance attenuation, and stiffness degradation of STHCCs is investigated. e hysteretic behavior and failure form of STHCCs are obtained, and the restoring force model of such columns is established
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