Abstract

Considering the influence of spatial variation of corrosion on cross-sectional areas and mechanical properties of stirrups,the probability distribution model for bearing capacity of corroded reinforced concrete columns subjected to chloride penetration under axial compression is studied in this paper.Introducing the probability distribution model of spatial heterogeneity factor for corroded reionforcement,the spatial distribution of corrosion of stirrup was quantified by discretizing the corroded column into several small elements along the axial direction.Using ABAQUS finite element analysis software,the bearing capacity of reinforced concrete columns with nonuniform corroded stirrups under axial compression was analyzed,and the probability distribution model was established.The calculation results showed that the bearing capacity of reinforced concrete columns with non-uniform corroded stirrups under axial compression could be fitted well by the Gumbel distribution,which was mainly dependent on the spatial variation degree of corrosion for stirrups,as shown in Figure 1.With the increases of corrosion degree,the location parameterμ was constant,while the scale parameter σ decreased significantly,as shown in Table 1.

Figure 1　Probability distribution of bearing capacity of corroded RC Columns under axial compression corresponding to different average corrosion loss ratio

Table 1　Values ofμandσcorresponding to different average corrosion loss ratio