| With the rapid development of China’s construction industry, the generation of waste concrete is increasingly dramatically. At the same time, concrete recycling has also become a major environmental problem to be solved. Recycled concrete can reduce the environmental pollution caused by waste concrete, and the exploitation of sand and gravel resources in order to protect the environment. However, the fact that the mechanical property and durability of recycled aggregate concrete are worse than natural aggregate concrete limits the use of recycled concrete.Recycled aggregate concrete filled steel tube structure (RCFS) is a combination of steel tube and recycled aggregate concrete. On the one hand, the core recycled concrete gets a improvement in strength and deformation capacity because of the confinement effect provided by steel tube, on the other hand, the steel tube becomes more stability because of the exist of core recycled concrete. The steel tube provides an isolated environment for the core recycled concrete to improve the durability of the concrete. RCFS make the best use of the advantages and bypass the disadvantages of the two kinds of materials.Based on the low cyclic loading experiment on a RCFS member and a common concrete-filled steel tube column(CCFS) member, this paper attempts to find the ductility and energy dissipation capacity of the members by analyzing the results, such as hysteretic curves, skeleton curves and stiffness degradation curves. Then we use the finite element software ABAQUS to analysis the two specimen, the results show that the skeleton curves of specimens and the stiffness degradation curves are basically consistent with the experiment results. In the end of this article, we analysis the influence caused by P-Δ second-order effect on the strength of the specimen and derive load-carrying capacity interaction equation. The theoretical calculation results verify each other in the range of error. |
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