| A lot of construction waste has been accumulated in the process of urbanization in China. The natural aggregate resources is also facing the problem of the shortage of itself. The recycling of waste concrete can solve these problems. However, the recycled aggregate concrete has the defects, which affects its application. Steel tube-reinforced recycled concrete composite column not only has the advantages of high bearing capacity, high stiffness, and good seismic performance, but also conducive to environmental protection. To study the mechanical properties of the steel tube-reinforced recycled concrete composite column,, the axis pressure experiment of the 22 steel tube-reinforced recycled concrete composite columns and another 5 specimens for comparison are designed in this paper. Test parameters are the recycled coarse aggregate replacement ratio, distance between stirrups, concrete strength, diameter and section of steel pipe, reinforcement ratio. The main conclusions are as follows:Firstly, distance between stirrups, concrete strength, diameter and section of steel pipe and reinforcement ratio are the main factors that influence the mechanical properties of the steel tube-reinforced recycled concrete composite column. The replacement rate is the secondary factor.Secondly, with the reasonable constitutive model of concrete, The calculated values of the complex stiffness are in good agreement with the experimental values.Finally, based on the previous theory of superposition, the concrete cover is considered, and the calculation formula of the axial load bearing capacity of the composite columns with double reduction factor is proposed. The calculated values of the axial compression bearing capacity are in good agreement with the experimental values. |
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