Open AccessAnalysis of Linear Influence of Long-span PC Continuous Rigid Frame Bridge during The Winter Break
Author(s) -
Zhigang Li,
Yifang Song,
Yunpeng Zhao
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/446/5/052015
Subject(s) - cantilever , structural engineering , rigid frame , deflection (physics) , box girder , beam (structure) , beam bridge , girder , span (engineering) , finite element method , engineering , frame (networking) , physics , mechanical engineering , optics
In the construction of large-span PC continuous rigid frame bridges, linear changes occur during the winter. In order to study the influence of the girder linear change on the monitoring line shape of the bridge, the actual bridge under construction was selected as the research object. Based on the finite element analysis software combined with the measured deformation data of bridges, the main influencing factors of the main beam linear deformation during the winter break are analyzed. 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.