Review of Study of Long-term Deflection for Long Span Prestressed Concrete Box-girder Bridge

Abstract

The long-term deflection of Long Span Prestressed Concrete Box-girder Bridge (LSPCBB) is getting more and more serious in terms of structure safety. And there are still many ambiguous reasons as to the cause of the deflection of LSPCBB. In respect of the causes of long-term deflection, domestic and aboard research literatures on the deflection problem of LSPCBB are reviewed and analyzed from the aspects of concrete creep and shrinkage, prestress effect, box-girder cracking, calculation and retrofit methods. Not only are the cause mechanism and research difficulties of the deflection explained, but also the suggestions about further research of long-term deflection control in design calculation, construction and retrofit technologies of LSPCCB are presented.