| Concrete-Filled FRP Tubes (CFFT) have many advantages, and it can meet the needs of modern engineering structures'development toward long-span, high rise, heavy load, high strength and light weight, as well as the need of bearing the mal-condition, in line with the industrial requirements of modern construction. Wide concern has been focused on since CFFT was initially recognized by the scholars at home and abroad, which has become one of the most popular item on new style composite structures. The results corresponding has been drawn a lot, however, studies on Reinforced Concrete-Filled FRP Tubes (RCFFT) have been very limited. Based on experimental and theoretical analysis, the mechanical behavior of the long Reinforced Concrete-Filled FRP Tubes columns under eccentric load are researched. The following work was completed:(1) Tests of RCFFT columns under axial load, as well as under eccentric load, are carried out to investigate the working feature and failure modes. The impact of GFRP tube confining on bearing capacity and ductility are researched.(2) The curves of ultimate bearing capacity,the deflection curves in ultimate load, the load-deflection curves and the stress-strain curves of the long RCFFT columns under eccentric load are studied. They are also used to analyze the impact of the factors such as concrete strength, ratio of length to diameter and eccentricity on mechanical behavior of the columns.(3)The assumptions such as the plane-section and the rod-axis'deflection curve is same as sinusoidal half-wave curve are verified to be feasible by the test results.(4) Stress-strain curves of concrete which is suitable for RCFFT columns under eccentric load and the numerical computational formula for calculating the bearing capacity of the RCCFT columns under eccentric load are proposed. The corresponding procedures are prepared and the calculated results can compare well with the experimental results.
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