A sub-region-based method for evaluating regularly and irregularly corroded steel tubes under axial compression

Abstract

Circular steel tubes (CSTs) are one of the most prominent types of members in spatial steel structures, which are commonly facing increasing durability problems. Although the effect of corrosion on the bearing capacity of CSTs has received increased attention by scholars, there is no sound solution regarding the quantitative evaluation of the bearing capacity of corroded CSTs, especially for those with irregular corrosion areas. This study proposes a solution for the evaluation of the bearing capacity of corroded CSTs. First, the accuracy of a finite element model is verified and a method for calculating the bearing capacity of CSTs with a regular corrosion zone is established. Subsequently, the effect of the relationship between the location of two corroded areas on the residual bearing capacity is investigated. Based on this, an evaluation method for irregularly corroded CSTs is proposed, where the impact is evaluated separately for the middle and edge zones of the tube. Finally, the specific process and essential parameters for the evaluation of the tube middle and edge zones are given, formulating a comprehensive method for evaluating the bearing capacity of corroded CSTs. The present research provides reference for the performance evaluation of steel tubes in spatial structures subjected to corrosion.