Study on the deterioration mechanism of shear properties of studs under chloride corrosion

To study the degradation law of shear performance of studs caused by chloride corrosion, this paper conducted experimental research on the shear performance of the push-out test specimens after soaking in chloride solutions of fresh water, one time seawater concentration, and five times seawater concentration for 28 days. Through analysis, the failure modes, load–displacement curves, ultimate bearing capacity and corresponding displacement of the specimens, the variation law of the failure modes of stud connectors under chloride-induced corrosion, the relationship curves between chloride concentration and the shear bearing capacity, and the influence law of chloride concentration on the shear performance of studs with different diameters were established. Test results indicate that the failure modes of the specimen include stud shear failure, stud yield failure, and concrete punching failure. The main failure mode of the specimen is stud shear failure/yield failure, and the concrete punching failure occurs on the larger size stud due to the corrosion of chloride solution, and the peak displacement of the specimen is reduced under this failure mode. Under the corrosion of chloride solution, the shear bearing capacity of studs decreases, and the decline range of bearing capacity increases with the increase of solution concentration.