This paper simulates the stress concentration caused by adjacent corrosion pits using experimental and numerical method. A detailed three-dimensional finite element solid model is established and validated by individual notched specimen. The shape factor and shape transformation factor are proposed to represent the relationship between the stress concentration factor induced by individual ellipse and triangular notch. A distance factor and an angle factor are integrated to represent the stress concentration factor resulted from adjacent notches. Quantitative expressions for stress concentration factors in multiple scenarios are obtained. The results show that the adjacent notches distributed along the longitudinal direction of rebar with a relative angle of 0° induced stress concentration factor is close to that the individual ellipse notch when the notch spacing exceeds a critical distance (6 mm), and using the latter scenario instead of the former scenario for simplified modelling process has an insignificant effect on stress concentration. For the adjacent notches distributed along the cross-section direction of rebar with a relative angle of 90°, the maximum stress is approximately 40% higher than that of an individual notch in the analyzed range of depth. Several suggestions are also provided based on the present study.

本文采用实验和数值方法模拟了相邻腐蚀坑引起的应力集中。建立了详细的三维有限元实体模型，并通过单个缺口试样进行了验证。提出了形状因数和形状变换因数，以表示单个椭圆引起的应力集中因数和三角形缺口之间的关系。距离因子和角度因子被积分以表示由相邻槽口产生的应力集中因子。获得了多种情况下应力集中因子的定量表达式。结果表明，当缺口间距超过临界距离（6 mm）时，沿钢筋纵向方向以0°诱导应力集中因子的相对角度分布的相邻缺口接近单个椭圆形缺口，并使用该缺口情景代替了简化建模过程的前一个情景，对应力集中的影响很小。对于沿钢筋横截面方向以90°相对角度分布的相邻槽口，在分析的深度范围内，最大应力比单个槽口的最大应力高约40％。根据本研究还提供了一些建议。使用后一种情况代替前一种情况进行简化的建模过程对应力集中的影响很小。对于沿钢筋横截面方向以90°相对角度分布的相邻槽口，在分析的深度范围内，最大应力比单个槽口的最大应力高40％。根据本研究还提供了一些建议。使用后一种情况代替前一种情况进行简化的建模过程对应力集中的影响很小。对于沿钢筋横截面方向以90°相对角度分布的相邻槽口，在分析的深度范围内，最大应力比单个槽口的最大应力高约40％。根据本研究还提供了一些建议。