10A. DIMENSIONING PART 1/4

A A D 1.3.1.6 Corrosion It is now possible to calculate the influence of reinforcement corrosion on the mechanical characteristics of structural elements (see EPC Annex 7F) by entering the initial and measured diameter. The program automatically calculates the corrosion rate Xcor, the corresponding degradation factors rcor and all the corresponding degraded quantities (resistances and deformations) according to the type of analysis. An important modification introduced by the 3rd revision of CEE is the reduction factors for the mechanical characteristics of structural elements with corroded reinforcement rcor In , Annex 7F proposes indicative values of the softening factor in relation to the corrosion rate Xcor, calculated from the following relationship ΔA A − A D 2 − D 2 X = s = s s , cor s = s , cor cor 2 s s s Where Ds : initial, nominal diameter of the reinforcement Ds,cor : measured diameter of corroded reinforcement The deterioration factors shall be calculated as follows: CAMPSY • The reduction factor, r cor , Fy , of the resistance moment F y , cor , of the structural element where corroded reinforcement occurs relative to the resistance moment of the element without corroded reinforcement, F y , is defined as: rcor , Fy = Fy , cor F y = 1, 00 − 1, 30 X cor (F.2) • The reduction factor, r cor , θ y , of the yielding strain, θ y , cor , of of a structural element where corroded reinforcement occurs with respect to the deflection at yield of the element without reinforcement corrosion, θ y , is defined as: rcor , θ y = θy , cor θ = 1, 00 y (F.3) In practice, it is assumed that the deformation in the leakage remains constant regardless of the degree of corrosion.