Time-dependent reliability analysis of circular CFST stub columns under environmental corrosion

Concrete filled steel tubular (CFST) columns subjected to environmental attack can experience changes in resistance that are time-variant. In this study, the axial compressive strength loss in circle CFST stub columns due to corrosion of the outer steel tube is investigated. The assessment of the time-dependent reliability analysis of circular CFST stub columns under environmental corrosion is presented. A probabilistic axial compression model for circular CFST stub columns is developed based on an analytic formula that considers corrosion-related and time-dependent factors. This study involves the formulation of a limit states function, the development of load models, the development of resistance models for corroded circular CFST columns, time-dependent reliability and resistance analysis for a hypothetical stub column. The results of this study can be applied to achieve a better prediction of the service life of deteriorating circular CFST columns and the development of optimal reliability-based maintenance strategies.