| Load-induced stress triggers moisture migration within the micro-pores of concrete, further influencing its shrinkage capacity. However, during hydro-mechanical coupling analysis, the relationship is often consid-ered weakly coupled, leading most existing models to neglect the redistribution effect of pore water caused by stress; consequently, these models fail to capture the additional shrinkage deformation induced by loading. Therefore, this study establishes an enhanced coupled hydro-mechanical model for concrete based on pore water migration theory, incorporating porosity corrections to the moisture diffusion coefficient. The asso-ciated algorithm was implemented using the ANSYS secondary development platform, simulating pore water redistribution under external loads, and its accuracy and reliability were validated against classical experimental data. Results demonstrate that under an 18.2 MPa axial compressive load, the moisture redis-tribution effect is most pronounced at the concrete center, exhibiting a change amplitude of approximately 1.35%. Conversely, under a 3.2 MPa tensile load, the strongest redistribution effect occurs at the external drying boundary, with a change amplitude of about -1.98%, and the magnitude of this effect increases with applied load intensity. This research aids in revealing the coupling relationship between moisture fields and stress fields, further elucidates the mechanism linking load and shrinkage, and provides novel insights for accurately assessing the true stress state in concrete materials. |
