Estimation of the residual strength of a concrete plate with a surface crack healed by injection

The effect of injection strengthening on the residual strength of plates with surface semi-elliptical cracks is investigated. Approximation relationships are proposed for estimating the stress intensity factors at the points of their maximum value. Formulas are obtained for determining the limit load of a strengthened plate. Based on finite element method calculations using the Code Aster software, the accuracy and applicability limits of the obtained approximation formulas are found. The results show good agreement of the approximate analytical relationships with the data of numerical calculations.