This paper proposes an internal stress monitoring structure and stress distribution monitoring method for prestressed anchor cables, validated through experiments at three scales. Tensile breaking tests of a single monitoring structure confirmed its strength exceeds that of the steel strand, with consistent deformation up to the yield load, meeting basic requirements for axial force monitoring. Dual-structure repeated tensioning tests at various stress levels showed consistent deformation. After 10 cycles of 220 kN tensioning, pro-cessing stresses and residual strains were eliminated, enhancing accuracy. A linear calculation formula be-tween monitored strain and axial force is established using data from 40 post-elimination cycles. A 9-m graded tensioning test with 8 monitored structures under simulated conditions revealed gradual stabiliza-tion of prestress attenuation (≈6%) along the cable length as load increased. The monitoring structure ac-curately captured stable force measurements reflecting characteristic changes. These results validate the ra-tionality and feasibility of the proposed structure and method for practical applications.
LIN et al. (Thu,) studied this question.