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

Abstract

Abstract 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.