Research on super-long prestressed concrete box girder crack control

At the setting of concrete molding process,it is easy to produce harmful cracks,material impact on the durability and reduce the structural reliability.To ensure the structural safety of long-term use,eliminate harmful to avoid the creation of cracks,the need for early concrete from the cracks under control.Yangtze River to Shanghai TRB project 70 meters of concrete box beam hardening process temperature and finite element stress analysis,combined with the monitoring data,Comparative analysis of the super-long concrete box girder condensation process of hardening the internal temperature and strain in the process.