This paper investigates the mechanism of the corrosion pattern of wires on the prestressing forces of prestressed concrete (PC) strands. A rigid frame testing machine combined with an electrically accelerated corrosion device was used to test 16 steel strands. Specimens subjected to the tensile load of 50% of the tensile strength were divided into three groups according to the target corrosion level (mass loss). The rigid frame testing machine can remain the prestressing force, and the force and deformation were measured continuously during the corrosion test. The prestress was degraded in two stages; the beginning and development of the second stage being related to the maximum cross-sectional area loss and fracture type of the wires, respectively. The prestress loss of the strands was the result of the internal force balance after the deterioration of the tensile properties. It was found that the deterioration process of the ultimate tensile capacity related to the fracture type of the wire. The fracture type of PC strand was influenced by the shape and the distribution of the cross-sectional area loss of corroded wires.

本文研究了钢丝腐蚀模式对预应力混凝土（PC）钢绞线预应力的影响机制。采用刚性框架试验机结合电加速腐蚀装置对16根钢绞线进行了试验。根据目标腐蚀水平（质量损失）将承受拉伸强度 50% 拉伸载荷的样品分为三组。刚架试验机可保持预应力，在腐蚀试验过程中连续测量力和变形。预应力分两个阶段降解；第二阶段的开始和发展分别与导线的最大截面积损失和断裂类型有关。钢绞线的预应力损失是拉伸性能恶化后内力平衡的结果。研究发现，极限拉伸能力的劣化过程与钢丝的断裂类型有关。PC钢绞线的断裂类型受腐蚀钢丝的形状和截面积损失分布的影响。