Review on Corrosion Mechanism and Mechanical Properties Degradation of Building Structural Steel

Abstract

Steel structure is favored by many designers because of its light weight, high strength, short construction period and good seismic performance, and is widely used in high-rise, super high-rise and long-span structures, but the shortcomings of steel structure corrosion are gradually highlighted. In the past 20 years, literature in relevant domestic and foreign journals, conference proceedings, and electronic databases were searched. The mechanical properties of corroded components were studied and summarized from the corrosion mechanism, corrosion influencing factors and rust pit morphology. It is found that the dangerous area of stress concentration of corroded steel is in the middle of the pit, and the maximum stress value is located at the lower edge of the pit mouth. The bearing capacity and ductility of the corroded steel structure are deteriorated, which seriously affects the structural safety under dynamic load. Due to the complexity of correlation analysis of atmospheric corrosion test of metal materials, it is still necessary to improve the corrosion data of existing steel grades and newly developed steel grades in natural environment. At present, there are few researches on corrosion of high strength steel, molded steel plate and prefabricated buildings. With the increasing application of high-strength steel, further research is needed to obtain the latest research results and apply them in practical engineering.