MECHANICAL BEHAVIOUR OF FRP-CONFINED CONCRETE COLUMNS UNDER AXIAL COMPRESSIVE LOAD

摘要

The strength, deformability and stability of concrete columns confined by carbon composite sheets is considered at axial compressive loading. The formulas for prediction of ultimate strength, ultimate strain, and the tangent modulus above the limit of nonlinearity are given. Confined reinforced concrete columns also are considered. The loss of stability of columns above the strength of plain concrete is analyzed and it is proved that FRP confinement is efficient only for columns having low or moderate slenderness (λ<40).