MODELING OF ALKALI-SILICA CORROSION OF PRESTRESSED CONCRETE STRUCTURES

This paper proposes a method for assessing the strength characteristics of prestressed reinforced concrete structures. The structures were subject to degradation due to alkali-silica corrosion. The methodology is based on the principles of information modeling. This allows for the integration of degradation process data into a comprehensive digital model of the facility. The methodology is based on a macromodel. It establishes a direct correlation between the swelling processes of reactive coarse aggregate and the resulting stress-strain state of the structural system. The key tool of the model is the modification coefficients introduced for the strength characteristics and elastic modulus of concrete. These coefficients allow for anisotropic reduction of the material's mechanical properties depending on the magnitude of swelling deformations. In this case, the multidirectional nature of the damage is taken into account. This study assessed the correlation between the reduction in modification coefficient values and the nature of the external force applied. The external force applied was either long-term compression or tension. Based on the obtained dependencies, practical recommendations for structuring and parameterizing the information model were formulated. The recommendations are aimed at improving the adequacy of assessing the load-bearing capacity and durability of damaged structures.