Work

Axial stability of chloride-corroded CES slender columns: Experimental and numerical study

Year: 2025

Type: article

Abstract: This paper investigated chloride-corroded concrete-encased steel (CES) slender columns subjected to axial loading. Twelve specimens were tested to assess corrosion effects on failure characteristics and performance degradation. Findings indicated that chloride corrosion accelerates structural deterioration and alters failure modes, with concrete cover damage depending on NaCl concentration and exposure time. Higher slenderness ratios amplify the effects of corrosion on axial compressive performance. The deterioration of load-carrying capacity and initial stiffness of CES columns is primarily influenced by corrosion duration and current intensity, while the effect on axial deformation capacity is relatively limited. A calculation formula was developed to predict the axial load capacity of corroded CES slender columns, considering the section loss and confinement effects of corroded steels. Stability analysis of all test columns using Euler's formula showed the absence of instability failure under axial compression. However, with increasing slenderness ratio and corrosion degree, the critical value of stability bearing capacity was observed to gradually approach the measured axial load-carrying capacity. This indicated that the combined effects of these factors significantly exacerbated the risk of structural instability in CES members. A finite element simulation approach was introduced to model corroded CES slender columns and validated against test results. Extended parametric analysis demonstrated that once the slenderness ratio surpasses 62, the overall stiffness and stability of the CES columns significantly deteriorates. These findings inform the performance assessment and durable maintenance of CES structures after chloride corrosion.

Source: Case Studies in Construction Materials

DOI: 10.1016/j.cscm.2025.e04671

Authors: Yuhan Lin, Zhiquan Xing, Libo Chen, Xiaoyong Zhang, Shujie Jiang, Yu Chen

Institutions: Fuzhou University, Nanjing Forestry University

Language: English

Topic: Structural Load-Bearing Analysis

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,660

Funder: National Natural Science Foundation of China