Abstract. In the current research program the force transfer mechanisms are investigated in = 0,035/0,071/0,142 )
. The jacket's longitudinal bars are welded to the ones of the core using steel bars of either 8 or 10mm diameter. To test the strengthened columns a loading pattern is selected in order to simulate the real structures, even though the experimental set up includes only axial loads (moments and horizontal loads are not examined). The behavior of specimens is investigated through P-δ, σ-ε, energy absorbed diagrams and the levels of ductility achieved. The results indicate that the initial damages affect
The study describes the retrofit of repaired elements by reinforced concrete (RC) jacketing conducted to quantify the influence of initial construction deficiencies and of different type of anchors to the ability of the interface to transfer loads. Sixteen specimens (section scale 1:2) were designed with variables the initial deficiencies and the confinement ratio. The results indicate that: a) the maximum resistance load and dissipated energy of initially damaged specimens are decreased; b) surpassing a specific amount of damage, columns even suitably repaired present lower strain capacity, c) welded bars lead to buckling of longitudinal bars.
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