Abstract：Based on the analysis of corrosion influence factors of prestressed anchorage structure，the pH value，time，stress level and material are chosen to be the main factors that can affect the corrosion characteristic of prestressed anchorage structure. By adopting the designing method of orthogonal combination about aforementioned factors，the indoor accelerated corrosion tests of prestressed bars have been carried out. From the experiment，the regular appearance of prestressed anchorage structure subjected to corrosion medium is obtained；and the influence laws of various factors on the corrosion weight per unit length and the section loss rate of prestress bars are also analyzed. Conclusions can be drawn as follows：with the increase of pH value，the corrosion weight per unit length shows decline trend in the form of negative exponent；on the other hand，with the passage of time，the corrosion weight per unit length presents continuously increasing trend in the form of power function，but the increment of corrosion weight decreases gradually；and the stress level has no significant influence on corrosion weight per unit length of prestressed bar. The fitting formulae obtained from the indoor accelerated corrosion test can correctly reflect the relationship of corrosion weight per unit length and various factors；and also it lays the theoretical foundation for the lifetime prediction of prestressed anchorage structure in various projects.
