Analysis of Influencing Factors of Prestress Loss under Bridge Anchor

To study the influencing factors of prestress loss under bridge anchors, the factors of prestress loss under anchors were first analyzed from a theoretical perspective.And Then a 25 m small box girder commonly used in Guangdong Province was used for data validation.According to the results obtained from the data verification, the analysis was extended to the prestressed structural beams of different lengths and types. Finally, a general 30 m box girder from Guangdong Province is selected for modeling and analysis, and the results are compared with the data verification. According to the results of different analysis stages, the data verification of 25 m small box girder proved the accuracy of theoretical analysis, and obtained that the single biggest influence factor of prestressing loss was anchor deformation and clip retraction loss, accounting for 81.0%. After considering the largest single influence factor, it is found in the analysis of prestressed structural beams of different lengths and types that when the beam type is the same, the greater the span, the prestressed loss will be relatively reduced, and when the span is the same, the loss degree of the box girder is smaller than that of the T-beam structure. The subsequent modeling calculation and analysis verify the accuracy of the above data analysis results. The conclusions obtained from the calculation and analysis can provide some reference for the relevant design and construction.