Three-dimensional nonlinear creep and shrinkage effects of a long-span prestressed concrete box girder bridge

摘要

To analyze the impacts of creep and shrinkage effects on the behaviors of long-span prestressed concrete box girder bridges, a new nonlinear analysis model of creep and shrinkage effects that comprehensively considered three-dimensional (3D) characteristics and girder damage evolution was presented. A corresponding numerical analysis method was implemented into the ABAQUS user-supplied subroutine; this method was verified by comparing the analytical results to the classical experimental results. Finally, a continuous rigid frame bridge with a main span of 220m was taken as an engineering example, and the analysis results and in situ measured data of long-term deflection were compared. The results show that the 3D characteristic and the nonlinear property of creep have significant impacts on the prediction of long-term deflection.