Linear control of prestressed concrete continuous girder bridge constructing by cast-in-place cantilever method based on forward-analysis method

Abstract

Based on forward-analysis method, the deformation of structure during each construction stage is calculated and accumulated for the request of linear control of long-span prestressed concrete continuous girder bridge constructing by cast-in-place cantilever method. Then the camber is determined considering some more factors, such as concrete shrinkage and creep, secondary permanent load, a half of static live load, etc. The points of linear control of long-span prestressed concrete continuous girder bridge are also summarized, which constructed by cast-in-place cantilever method. The line shape of whole structure was controlled well according to the result of elevation association survey before closure, the deviation is limited within the confine provided by code, which is important to the closure of bridge. This paper would provide reference value for linear control of the same type of bridges.