Based On Material Time-varying Characteristics Of Cantilever Bridge Control

Prestressed concrete continuous girder bridge has its unique advantages in various t y p e s o f b r i d g e s t r u c t u r e. Wi t h r a p i d d e v e l o p me n t o f C h i n a ’s h i g h w a y traffic this year, it has been widely used and boost a new era, all the prestressed concrete continuous beam bridge emerge in endlessly. At present, the simply supported continuous, incremental launching method, cantilever pouring method and cantilever erection method are the main construction methods of prestressed concrete continuous beam bridge, one of the most extensive methods are cantilever pouring and cantilever erection. The cantilever construction method, in order to ensure that the structure of the bridge alignment and folding accuracy meet the requirements and bridge can meet the expected design elevation after operating for many years, it must carry on the cantilever construction monitoring, and the time variation characteristics of the material is the key to determine success or failure of the cantilever construction control, but the study found that the design of the software generally taken the time-varying characteristics into account are the current America specification(ACI) or the European standard(CEB-FIP), because China has no material specification, which makes China is lack of strong theoretical foundation on the cantilever construction monitoring.In view of this phenomenon, this paper analyzed and summarized the domestic and foreign development of prestressed concrete continuous beam bridge and the current construction control technology. Based on the Qinhe River Bridge, in the city of Jiaozuo in Henan province as engineering background, and do the research about the construction control of large span prestressed concrete continuous girder bridge. We studied by using the finite element software Midas/Civil, considered the time-varying characteristics of the material, and according to the characteristics of the construction control of prestressed concrete continuous beam bridge to calculate the model of bridge, carried on the simulation analysis of the whole construction process, combined with the practice of bridge monitoring and fi n a l l y e s t a b l i s h a m o n i t o r i n g s c h e m e o f Q i n h e B r i d g e. R e l y i n g o n t h e Qinhe Bridge(35+7*60+35) m continuous beam bridge, compare and analysis the theoretical and real values among the commonly used American specification, Euro code and considering the time-varying material code, confirm that based on t h e t i m e- v a r y i n g c h a r a c t e r i s t i c s c a n t i l e v e r b e a m b r i d g e c o n s t r u c t i o n monitoring proves to be good, and put forward the new method on the prestressed concrete continuous beam bridge construction monitoring, enrich the bridge construction monitoring technology in our country. The research work of the construction monitoring can be used as references to similar bridges in the future.