Research Of The Influence Of Large-span Continuous Concrete Bridge Creep On Setting Camber

Creep is the inherent nature of concrete,creep of prestressed concrete structures, especially large-span prestressed structure of coagulation on the bridge has a significant performance impact.Creep of concrete in design and construction of a large-span prestressed concrete bridge is a very difficult problem and can not be evaded.In particular,the deflection of bridge resulting from creep of concrete impact directly on bridge security and the use of performance,then the request must be able to accurately grasp the concrete creep on the pre-set the effects of camber.First of all,the mechanism of concrete creep and the external and internal factors of concrete creep are summarized;and then,a comparative analysis of several forecasting models commonly used at home and abroad for creep mechanism are taken into account,including the scope and the advantages and disadvantages for the actual structure.It laid the foundation for study of concrete creep.Then the effects of concrete creep are studied with the finite element method in this paper.The finite element method and the steps for creep effect of the large-span concrete girder bridge constructed with the cantilever construction method are introduced;For the use of finite element analysis software MIDAS creep effect of concrete of large-span continuous concrete girder bridge impact of camber settings provides a theoretical basis.In this paper,the North Han River NO.1 Bridge as for example,it described the use of cantilever construction of large-span prestressed concrete continuous girder bridge of the camber settings methods,which includes the construction of camber settings and pre-bridge camber settings,as well as camber settings of the various factors;Finally,finite element analysis software MIDAS,to the North Han River NO.1 Bridge as engineering background,focus on an analysis of creep effects on the bridge pre-set the effects of camber.From the construction of creep on the construction camber settings and impact of finished bridge camber settings,this paper Analyzed,particularly for pre-camber,the difference of the finite element analysis results with the traditional methodology of finished bridge camber curves.Found that the traditional method had larger the difference between the actual results of the analysis.Finite element method analysis of the finished bridge camber is more in line with the actual.