FRICTION TEST AND PARAMETER ANALYSIS OF PRESTRESSED CONCRETE CONTINUOUS BEAM BRIDGE

The prestressed ducts of concrete continuous girder bridges are usually three-dimensionally distributed and long in length. control prestress loss during construction is very important. In order to ensure the effect tensioning, test analysis friction parameters particularly Based on tension process a beam bridge, initial stress, loading time channel bridge tested by field tests. Combined with measured parameters, finite element software Midas / Civil used analyse influence mechanical properties bridge. results show that when steel bending angle not more than 40° length 70 m stretched, stress suggested be set as 20 % force 5 min. tunnel larger standard value, should adjusted formal construction；The deflection key section main increases increase roof decreases parameters. change deviation coefficient has greater impact coefficient.