In order to study the effect of linear changes of the long-span PC continuous rigid frame bridge under construction on the monitoring bridge alignment during the winter break ,with the help of finite element analysis software and the measured data of the linear change of the cantilever main beam , the constructing bridge was taken as the research object to set to stady and analyse the main influencing factors of the linear deformation of the bridge during the cantilever wintering and the effect on the the bridge alignment .When the latest construction section of the cantilevered beam is untensioned and retains the beam-end hanging basket to enter the cantilever wintering stage, The final analysis results show that the linear deformation of the main beam during the period of the winter break is as follows .When the length of cantilevered beam is less than 13L/32, the linear deformation of the cantilevered main beam during the winter break period has a little influence on bridge alignment; when the length of the cantilevered main beam exceeds 13L/32, the girder will gradually produce the downward deflection during the winter break . In order to avoid the continuous downward deflection of the main beam during the winter , the prestressed reinforcement of the latest construction section need to be tensioned to reduce the amount of deflection of the main beam during the winter break ; When the longest cantilevered beam enters the winter break period , the position of the hanging basket needs to be adjusted to adjust the linear deformation of the main beam during the winter break .

CICTP