Research on the Deterioration of Shear Performance of Stud Connections Under Artificial Seawater Erosion

Abstract

This study investigates the impact of different erosion environments on the shear performance of stud connectors. A series of push-out tests were conducted to systematically analyze the degradation of shear performance in stud connectors of various diameters under the influence of artificial seawater immersion and wet-dry cycling erosion. By examining failure modes, load–displacement curves, ultimate shear capacity, and peak displacement, the trends and mechanisms of shear performance degradation due to artificial seawater erosion were revealed. The experimental results show that with prolonged erosion time, the failure mode of stud connectors transitions from shear failure to concrete crushing failure, accompanied by a significant reduction in shear capacity and peak displacement. Notably, after 56 days of immersion erosion, the shear capacity of the specimens decreased by 50–60%. Compared to immersion erosion, wet-dry cycling erosion had a more significant impact on the stud connectors, with the shear capacity of specimens under wet-dry cycling conditions being approximately 70% of that under immersion erosion. Moreover, the peak displacement of the specimens decreased significantly under wet-dry cycling erosion, indicating a greater degradation of plasticity and ductility of the bolt connections. Based on the experimental results, this study provides a quantitative assessment for evaluating stud performance degradation in structural engineering design.