| Prestressed concrete continuous rigid frame bridge span bridges to meet the large force requirements, in addition to the main cross-beam at both ends of the range is no other than the joints, is conducive to smooth driving comfort, but also has good overall performance of the structure, seismic ability, carrying capacity strong, quick construction, easy maintenance and ease of cantilever construction and other structural characteristics, relatively fast in recent years has been the development of prestressed concrete bridge in the bridges constructed and those under construction (main span of 150～300m) occupy an increasingly large proportion.Prestressed concrete bridge in the present structure, the size of prestressing loss of shrinkage and creep of the accurate calculation of the continuous rigid frame bridge construction control long-term deflection and has a direct impact. This first step starting from the creep of concrete, creep through the mechanism, influencing factors, methods of calculation and analysis are expected to explain its prestressed concrete continuous rigid frame bridge deflection under the impact of long-term. The second step from the perspective of loss of prestress, and the model described by comparing the theoretical conclusions are drawn.Most of prestressed concrete rigid frame bridge with economical and rational Cantilever Construction Method. This construction method used, the bridge structure will bring more power and flexibility of complex changes in stress. In order to ensure the quality of bridge construction and bridge construction, safety and reduce the main beam possible future long-term deflection, bridge construction is essential links and measures. In the third step of the specific projects involved, Feng Yong-speed water channel bridge construction control elements, methods were introduced two years after the bridge and into a long-term Deflection data were analyzed. |
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