| Reactive Power Concrete (RPC) is a kind of cement-based composite which has ultra-high strength and brittleness. Steel tube RPC is formed by putting RPC into steel tube, which can solve the practical engineering problem arose by the brittleness of RPC. This is the best method to utilize this cement-based composite material with ultra-high strength in engineering application. Papers about steel tube RPC were written by some scholar to this day, but there are few papers about the research of eccentrically loaded slender column of steel tube RPC. Researches and experiments of 24 specimens of eccentrically loaded slender column of steel tube RPC will be discussed in this paper. The numerical model of circular steel tube RPC is established with ABAQUS which is common analysis software of finite element method (FEM). Researches on mechanical properties and mechanism of eccentrically loaded slender column of steel tube RPC are investigated both in theory and experiment, the main achievements are summarized in detail as follows: 1,The data of lateral deflection,longitudinal strain,transverse strain,ultimate bearing capacity of 24 specimens of eccentrically loaded slender column of steel tube RPC in all level loads were tested, And characteristics of deformation and failure of the specimen in the course of loading are also particular noted. 2,Analyzing the mechanics behaviors of eccentrically loaded slender column of steel tube RPC which is influenced by hoop coefficient,slenderness ratio etc, we can draw the conclusion that they belong to inelasticity destabilization failure. The most prominence parameter is eccentricity ratio, and ultimate bearing capacity descends as eccentricity ratio and slenderness ratio increase. The influence of hoop coefficient to ultimate bearing capacity is un-conspicuous, but the after strength of the specimen will be increased as the hoop coefficient increases, and ductility of specimen will be improved. 3,After prescribe the standard column cell, the formula of ultimate bearing capacity,slenderness ratio and eccentricity ratio reduction factor of ultimate bearing capacity of eccentrically loaded slender column of steel tube RPC is established. The results of calculation and the data of experiment are in good agreement. The formula adopted by this paper can be applied in calculating ultimate bearing capacity of eccentrically loaded or axially compressed steel tube RPC column with different slender ratios and eccentricity ratio. 4,The numerical model of steel tube RPC is established in this paper. Full-processing analysis of RPC steel tube filled of axially compressed stub column,eccentrically loaded stub column,axially compressed slender column and eccentrically loaded slender column was obtained with ABAQUS. The results of FEM calculation are in good agreement with the data of experiments, and it fully indicates that the numerical model and theoretical calculating method adopted in this paper can apply to full-processing analysis of steel tube RPC. 5,Results of the FEM analysis indicate that the relationships of stress-strain of eccentrically loaded specimens are much more complex than those of axially compressed specimens. The plastic deformation mainly converges on the small range around the mid-span dangerous section. Lateral compression is feeble when specimen reaches its ultimate bearing capacity, then it will be increased as specimen enter the descending branch of load-deformation curve, and the lateral compression in tensile region is stronger than that in compressive region. It can be observed that the lateral compression in one forth span of the specimen occurs later than it generated in mid-span, and its value is also small. The core RPC under different compression has different stress-strain relationship.
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