The Research And Practice Of The Influence Of Prestressed Concrete Creep On The Long Span Continuous Beam Construction

The concrete creep causes the redistribution of internal force in the beamconstruction; it has been the focused problem in the engineering for a long time. Theconcrete creep not only affects the deformation and internal force of construction, butalso the performance of the long-term usage of construction directly. In recent years,with the development of construction analysis and construction techniques, the newprestressed concrete construction of long span and indeterminate of higher degreeappears continuously. The higher request is put forward to the time effect analysis ofcomplicated bridge construction, but it is very difficult to carry out the detailed andvalid time effect analysis in practical engineering. On one hand there are a lot of factorsaffecting the concrete creep and there is a variety of complicated regulations; on theother hand there are the difference of construction methods of long span prestressedconcrete bridge and the limitation of practical conditions. This paper sets Jinbin Aerial Railway Engineering Project as an example and thethree-span prestressed concrete continuous box girder bridge is selected as theexperimental beam in the research. In it the influence of the concrete creep developingregulation and temperature effect on the performance of the beam is studied. So thevarious performance data of prestressed concrete beam can be completely controlled,Especially the creep camber can be controlled effectively to satisfy the request and toprovide the rational suggestion for the design and construction of all the bridges alongJinbin Aerial Railway.