不均匀锈蚀钢筋截面分布特征与拉伸数值模拟OACSTPCD

To study the distribution of residual cross-sectional area of corroded steel bars and the effect of non-uniform corrosion on the mechanical properties of steel bars,the corroded steel bars are obtained by elec-tric accelerated corrosion test.The residual cross-sectional area data and 3D solid model of the corroded steel bars are obtained by 3D scanning,the residual cross-sectional area is analyzed statistically,and numerical sim-ulation is carried out base on 3D scanning model.The results show that the non-uniformity of residual cross-sectional area along the longitudinal direction increases significantly with the increase of corrosion degree.For steel bars with average cross-sectional corrosion rate＜20.00％,the normal distribution model can be used to fit the probability distribution of the residual cross-sectional area,and for steel bars with average cross-section-al corrosion rate＞20.00％,Weibull distribution model can be used to fit the probability distribution of the re-sidual cross-sectional area.Nominal yield strength,nominal ultimate strength and nominal ultimate strain of steel bars decrease with the increase of average cross-sectional corrosion rate.The stress concentration occurs at areas with severe rust damage,which leads to the degradation of mechanical properties of the corroded steel bars.