Upgraded experimental database of uniformly FRP confined concrete columns for assessment of existing recommendations

Current studies concerning statistical elaboration and review of existing experimental results in databases, usually include only the characteristic maximum bearing stress and corresponding strain values as well as the failure values. In cases of uniform confinement failure values may be defined at 20% or 15% drop of maximum load or when the FRP jacket is fractured. Several recommendations include additional failure criteria related to lateral strain level or axial strain level in order to ensure the integrity of the columns or avoidance of shear failures among else. An experimental database based on the whole stress-strain response curves is presented, providing significant data necessary for the extensive assessment of the existing design models. The experimental database contains information on: a) the failure stress and strain values, b) on the stress and strain values at the level of 0.4% lateral strain as well as c) on the stress at the level of 1% axial strain. FRP confinement strength models recommended by existing guidelines are compared against experimental values.