Construction Deformation Study Of Long-span Curve Rigid Frame Bridge With High Piers

With the rapid development of High-grade highway in mountainous areas and elevated road in cities, the large-span prestressed concrete curved rigid-frame bridge has been widely applied in recent years on account of unique advantages, such as, well adaptation to its terrain, lessening the length of road expanding, and more and more smooth road. However, curved continuous rigid-frame bridge combines the forcing bearing characteristics between curved girder bridge and rigid-frame bridge, which makes the structure analysis complicated.In this paper, a large amount of document about curved girder bridge at home and aboard has been consulted. Meanwhile, the paper is summarized the design and construction method, elaborated the current research situation and development, analyzed its forcing bearing characteristics and main factors affected that, and inducted analysis theory of curved girder bridges.From construction deformation, taking Shima River Bridge as the background, MIDAS software is used to establish a calculation model of construction control of curved continuous rigid-frame bridge, in order to study the deformation in the case of bridge subjected to self-weight, shrinkage and creep of concrete, prestress, cradle load, concrete wet weight, temperature load and secondary permanent load in construction phase. It focuses on detailed research of the linear control. What is more, the detailed analysis is from three aspects, respectively, the vertical pre-camber, reversing pre-camber, and pier verticality. The transverse deformation value between different pier height and curvature in maximum cartilever state is caculated. When the pier height is invariant, found straight and bending calulation dividing point. Besides, it simulates the relation curve between pier height and central angle and puts forward the straight and bending dividing empirical formula from construction deformation.Combined the research between curvature and pier height, this paper has realistic significance. Further more, through analysis, curved continuous rigid-frame bridge provides good engineer practical significance for the development of Western areas .