Corner Effect Of FRP Confined Concrete Rectangular Columns Analysis & Experiment Research

Because of its configuration character and its unique excellent performance behaved in civil engineering, FRP is being widely applied in the reinforce field. The current research is focused on the FRP confined reinforced concrete columns. The models of FRP confined circular, square and rectangular sections based on stress, strain and other relative parameters are proposed recently, but these models still have some limitation and are hard to predict the reality accurately. Proposing a new formula of capacity, this thesis provides a more accurate model to emulate the effect of FRP confined circular, square and rectangular sections.The intensity model based on traditional triaxial testing results is adopted. Models of reduction coefficient considering the section shape are collected and concluded into three species, that is, corner radius model, effective confined area model, and equivalent confining stress model. According to the principal of equivalent confining stress, the idea of equivalent diameter is proposed for the first time.The strain distribution along the section and influence affected by corner radius are studied, using finite element analysis software to simulate circumstances under both axial compression and eccentrically load. The actual condition is investigated by simulating non-slip and unbonded conditions. The corner effect is researched from two parts (confining stress and equivalent diameter) which is the main parameter of confining stress, and then, propose suggest formula. Not only the affluence affected by corner radius is taken into account in this formula, but also the ratio of two side length in rectangular specimens.The axial compression and eccentrically loaded experiments of CFRP-confined rectangular columns with corners are taken in this paper. The strain distribution of experiment and the theoretic results are compared and analyzed. Lots of experiment figures are compared with suggestion formula, which comes to a conclusion that the formula suggested by this paper has an adequate precision for actual project.