Corrosion Process and Bearing Capacity Evolution Characteristics of Welding Studs Under Real Corrosion Path

Abstract:

This paper presents the static property of steel plate composite beam welded connections after corrosion degradation caused by chloride salt exposure. The degradation test involves the use of six studs， and the results of the test are used to explore the effects of rust on connections’ mechanical properties. The chloride salt corrosion path of environment-concrete-stud head in a bridge deicing salt environment is simulated. After the test is completed， the three-dimensional scanning reconstruction of studs shows that the stud heads are the most severely corroded， while the corrosion on stud shafts is relatively mild. The finite element simulation based on the three-dimensional scanning reconstruction of studs and experimental results reveal that as the degree of stud rust increases along the environment-concrete-stud head corrosion path， the connection’s bearing capacity， ultimate slip， and overall stiffness gradually decrease. According to test results， a corrected formula for the shear bearing capacity of the connection and a corrected formula for the load-slip curve of the connection， considering the rust rates of stud heads and stud shafts， are derived. The formulas show that compared with stud heads， the rust on stud shafts is more likely to cause a reduction in the connection’s shear resistance.

Key words:studs;corrosion;push-out test;three-dimensional scanning reconstruction;load-slip curve