Finite Element Analysis Of The Cross-Shaped Recycled Concrete-Filled Steel Tube Core Column Under Axial Compression And Seismic Behavior

The rapid development of the construction industry has made people put forward higher requirements for the practicality and comfort of the house.The appearance of reinforced concrete special-shaped columns not only solves the phenomenon of column protrusion in buildings,but also improves the effective utilization area of buildings.The special-shaped reinforced concrete core column is a product of combining the concrete-filled steel tubular column with the reinforced concrete special-shaped column.It not only combines the advantages of the above two columns,but also the protection of the external concrete to the steel pipe can delay the steel pipe.Aging,improve the carrying capacity of the structure.The development of the construction industry has also brought a large amount of construction waste to the city,concrete in construction waste can be recycled into concrete after processing and sorting.In this paper,the mechanical properties of the cross-shaped recycled concrete-filled steel tube core column(CRCC)are studied,which provides a new channel for the utilization of waste concrete and lays a foundation for the application of such components in practical engineering in the future.This paper mainly studies the following two aspects.(1)The mechanical properties of CRCC under axial load were studied by using the large-scale finite element analysis software ABAQUS.The factors affecting the mechanical properties of the simulated specimens were analyzed by changing the replacement ratio of concrete recycled coarse aggregate,the wall thickness of steel pipe and the strength grade of steel pipe and the intensity of influence.(2)The mechanical properties of the CRCC under low-cycle reciprocating load were simulated by ABAQUS software.The simulation results were used to analyze the effect of the recycled coarse aggregate replacement rate and the axial compression ratio on the seismic performance of the simulated specimen.According to the simulated stress cloud diagram and the extracted load-displacement curve and hysteresis curve,the failure mechanism and failure characteristics of the simulated specimen are described.Through the above research,the influence of various parameters on the axial pressure and seismic performance of the simulated specimens is analyzed,which provides a theoretical basis for the application of the shaped steel tubular recycled concrete core column in academic and engineering.