| Reactive powder concrete(RPC) is a kind of new building material with high strength, high performance and high durability. Combined with steel tube, the ultimate bearing capacity of reactive powder concrete is going to been enhanced. The brittleness is going to been overcomed on account of confinement effect provided by steel tube. The RPC-filled steel tube has a broad application prospect.Through a comprehensive analysis of all the previous research achievements of rpc-filled steel tube, a research on the ultimate bearing capacity of compressed RPC-filled steel tube column was carried out in this paper by using ABAQUS. The main contents are as follows:(1)The formula of ultimate bearing capacity for RPC-filled steel tube stub column under axial compression was derived based on the derivation method for the normal concrete-filled steel tube columns. Combined with the Euler equations, the formula of ultimate bearing capacity for long RPC-filled steel tube column was given based on material mechanics calculations on long column stability capacity. Mechanical performance of RPC-filled steel tube column under eccentric pressure was analyzed.(2)The models of RPC-filled steel tube stub column had been established, which were proved to be reasonable compared with the previous experimental results. The mechanical performance and ultimate bearing capacity of short columns under axial compression had been analyzed. It showed that the ultimate bearing capacity calculated with the formula fitted from the model agreed well with the existing experimental data.(3)The models of long RPC-filled steel tube column had been established, which were proved to be reasonable compared with the previous experimental results. The mechanical performance and ultimate bearing capacity of short columns under axial compression were analyzed. Impact of slenderness ratio on ultimate bearing capacity of long RPC-filled steel tube column had been analyzed, and the formula for calculating stability coenffient had been fitted with the calculating results.(4)Models of both short and long columns under eccentric pressure had been established based on the compression models. Full notes about mechanial performance, load-strain curve、moment-curvature curve were made according to the results. We analyzed the influence of eccentricity on ultimate bearing capacity for both short and long columns. The results showed that an increase of eccentricity in a certain range had little effect on the ultimate bearing capacity. The ultimate bearing capacity and ductile improved with the increase of confinement index(ζ).(5)Caculating results of this paper tallies well with the existing experiments, the given formula of the ultimate bearing capacity can agree well with the practice. In the future study, more experimental data and conclusions could make amendment mutually with this paper. |
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