Experimental investigation on the cyclic performance of corroded high-strength steel

Abstract

In this article, focused on the cyclic performance of corroded high-strength steel, experimental investigation was carried out. Accelerated corrosion tests were conducted with the method of the wet/dry corrosion cyclic tests to simulate the corrosion behaviour of structural steel in an industrial marine atmosphere, then variable strain amplitude cyclic tests were carried out on coupon specimens with a total of 4 corrosion degrees C0/1/2/3 obtained from the accelerated corrosion tests. The cyclic stress-strain curves, skeleton curves, and energy dissipation capacity for each corrosion degree were analyzed. The constitutive model of the corroded Q690D high-strength steel was established and validated with the finite element simulation. The results show that corrosion causes degradation of the specimen loading and unloading stiffness, and deteriorates the bearing capacity under cyclic loads and the energy dissipation capacity. The cyclic stress-strain curves of the simulated results agree well with those of the experimental results, indicating the validity of the established constitutive model of the corroded Q690D high-strength steel. The findings of this study can provide a reference for the cyclic behaviour of corroded high-strength steel and provide basic material data for conducting seismic performance analysis of high-strength steel structures after corrosion.