The study on prestress loss of cable-pylon anchorage zone in cable-stayed bridge

The stress of cable-pylon anchorage zone in cable-stayed bridge exists and its distribution is very complex.By testing and analyzing the prestress loss which is produced in the course of anchoring due to the bars shrink,The deformation of the anchor agescable-pylon and the actual calculation formula are dedured.This paper supposes that the friction and anti-friction is equal,the second kind of prestress loss considering anti-friction effects is deduced when the bars shrink.Reasonable calculation formula are obtained.The calculation result is in good agreement with actual circumstances.In the meantime,on the basis of observing the experiment and analyzing the result of experiments,the influence of the material to the second kind of prestress loss σl2 is pointed out.