Through the test of friction loss of pipe with 6 kinds of prestressed reinforcement for 32m simply supported box girder of Yanmiao bridge of Wuhan-Guangzhou passenger special line,the least square method was used for the analysis,and friction coefficient between prestressed steel rope and pipe wall and pipe deviation coefficient were obtained.

A study of the layout of pre-stressing tendon and the formula for calculating area used in checking local compression bearing capacity

Little has been presented about the existing small curvature radius U-shaped prestressed tendon,whose practical elongation value and theoretical stretching elongation deviate greatly from each other.