Research on Elastic Modulus Conversion of Corroded Cables Considering Stress Concentration

The cable elastic modulus conversion method is a technique that incorporates cable corrosion effects into the analysis of the overall cable-stayed bridge structure by converting the cable elastic modulus. However， its applicability in cases with complex corrosion pits on the cable wire surface is questionable， and scenarios involving significant stress concentration near the pits are not considered. In this paper， through the finite element simulation of corrosion pits on the surface of a cable wire， the relationship between the major-to-minor axis length ratio， depth， number， and spacing of the pits and the stress intensity factor of the wire was fitted binarily with consideration of the coupling effects between each pair of parameters. The applicability of the cable elastic modulus conversion method under various combinations of these parameters was then verified. Furthermore， the basic applicable conditions of the conversion method were defined by comparing cable stresses in the completed state of a specific cable-stayed bridge. The results showed that the stress concentration factors increased with the major-to-minor axis length ratio， pit depth， and pit number， and decreased with pit spacing. The elastic modulus conversion method is well applicable to combined scenarios of various corrosion pit parameters and meets the accuracy requirements of engineering calculations. However， it cannot be directly used when the local cable stress surpasses the ultimate strength of the steel wires.