| Taking the 16-22-span pre-stressed concrete continuous beam of Al main bridge of Gulou overpass in Hohhot as engineering background, aming at disease status for prestressed concrete continuous box girder bridges and combined with evaluation of bridge load test, this paper discusses the stress performance on the base of the current standard of bridge. Next, numerical simulating analysis for the damaged structures of prestressed concrete continuous bridge with prestressed CFRP plate is analysed. The superiority of effectiveness of prestressed CFRP-lamina was appraised in the cold region, and its optimization scheme is analyzed. The method and the approach about prestressed CFRP plate provide the technological basis for similar result diseases of bridge in this paper. Main content on the paper was summarized as follows:Firstly, based on the detailed survey of Gulou overpass, the existing research achievements, at home and abroad, on external prestressed CFRP-lamina are systematically analyzed.Secondly, combined the engineering design information of Gulou overpass, through calculation on old bridge with current bridge codes, some preinjury mechanical behavior about structural performances was obtained.Thirdly, owing to the bridge crack checking and concrete nondestructive testing, the main diseases of bridges are summarized, and the specific reasons of the bridge diseases are analyzed. Through assessment and analysis using finite element software Midas/FEA330 on field static load tests of bridges, evaluate mechanical behavior of Gulou overpass after strengthening damage main girder.Finally, force analysis considering damage effect of materials is studied for concrete structures. With practical construction examples, numerical simulating analysis for the prestressed concrete continuous bridge with prestressed CFRP plate is analysed. On the basis of grade B of loadings for the municipal bridge design, this paper explores the overload performance and put forward optimization analysis.
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