Research on the compressive bearing capacity of thin-walled square steel tube short columns reinforced with high ductility concrete
In response to the problem of low bearing capacity of thin-walled square steel tube short columns,a reinforcement method of wrapping high ductility concrete was proposed to improve the ultimate compressive bearing capacity and ductility of the components.A finite element model of thin-walled square steel tube short columns reinforced with high ductility concrete was established by using ABAQUS finite element software,material properties tests were conducted on existing materials,and the results were used to establish constitutive relationships in finite element analysis.Using epoxy resin as the binder,the effects of different width to thickness ratios(40,48,67)and different reinforcement thicknesses(4,8,12 mm)on the ultimate compressive bearing capacity and failure mode of thin-walled square steel tube short columns reinforced with high ductility concrete under static loading were considered.The finite element results indicate that the ultimate compressive bearing capacity of the components strengthened with high ductility concrete can be improved by about 30%-50%,and the reinforcement effect becomes more obvious with the increase of width to thickness ratio or reinforcement thickness.The theoretical formula for the bearing capacity of thin-walled square steel tube short columns reinforced with high ductility concrete has been derived,and the error between the theoretical formula and the finite element method can be controlled within 10%.
cold formed thin-walled steelhigh ductility concretebondingultimate compressive bearing capacitytheoretical formula
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