ABSTRACT
To obtain the time-dependent regularity of shrinkage and creep in long-span prestressed concrete beam bridges accurately, enhance the prediction accuracy of long-term deformation and prestress losses, the longitudinal shortening of beam length of a prestressed concrete bridge with five-span continuous rigid frame-continuous beam structure is analyzed. The analysis adopts four general and two modified calculation models according to the theory of uniformity distribution on the cross-section of shrinkage and creep and the calculation method of increment superposition in stages. The calculation model that can reflect the long-term shrinkage and creep regularity of the structure is obtained through the comparison and analysis of calculated and measured data. The data is verified through the test of the longitudinal prestress losses caused by shrinkage and creep. The results show that the modified model B3 has high prediction accuracy, which can be used to analyze the shrinkage and creep effects in long-span prestressed concrete beam bridges.
