Test and Theoretical Investigations on Flexural Behavior of High‐Performance H‐Shaped Steel Beam with Local Corrosion in Pure Bending Zone

This article undertakes the tested and theoretical investigations on the flexural behaviors of high‐performance steel (HPS) beams subjected to local corrosion in pure bending zone. Four H‐type HPS beams are designed, then the flexural bearing capacity test is carried out. Mechanical behaviors, including load‐deflection response, strain development, and failure modes are investigated in detail. A simple theoretical model of flexural strength is proposed. The tested and theoretical results show that: with the increase of corrosion rate, the random distribution of the residual section of HPS beam tends to be stable, the corrosion position also plays an important role in the random distribution of the residual area. The corrosion position has a greater influence on the residual flexural strength of corroded HPS beam than the corrosion degree. The theoretical flexural strength model can slight accurately predict the flexural strength of corroded H‐type HPS beam, the error is less than 5%. The corrosion of compressive flange has the most serious effect on the flexural strength degradation of HPS beams, followed by the corrosion of tensile flange and web corrosion. The influence of corrosion in the web height direction on the flexural strength of corroded HPS beam is extremely limited.