Research On Long-term Deflection Of The Long-span Continuous Rigid Frame Bridge Due To The Unbalanced Moment

In recent years, long-span continuous rigid frame bridge in China’s development is veryrapid. However, the prevalence of long-term domestic and foreign Such bridges downdeflection is too large this problem, the study large span prestressed concrete continuous rigidframe bridge deflection under long-term impact of factors and control measures has veryimportant significance. This paper analyzes the impact of prestressed concrete continuousrigid frame bridge under long-term deflection of several factors, comparative analysis of twoexamples of bridge engineering internal unbalanced moment the impact on the deflection,and the instances in which a project related to the use of load balancing method control ofdeflection theory.1.Describes the theoretical concepts related to load balancing, introduced zero momentmethod based on load distribution beams prestressed calculation method, and deduced thestructure of the cross-sectional unbalanced moment caused by long-term deflection formula.2.Using the finite element method to analyze the girder stiffness, annual average relativehumidity, beam segment initial loading age, overweight and prestressed bridge size andother factors on large-span continuous rigid frame bridge span deflection under the effect ofcausing structural internal unbalanced moment the main reason;3.Comparative Analysis study A and B due to the different examples longitudinalprestressing steel cantilever beam configuration caused the largest state of unbalancedmoment situation, side span and mid-span bridge in the adult, and10years after the changeof the displacement effects of different degree of unbalanced moment on the impact oflong-term deflection;4.In accordance with the basic idea of load balancing method, based on the maximumprestressing cantilever bending moment and weight roughly equal principles for thecontinuous rigid frame bridge B, optimize the allocation of the roof beams, the optimizedconfiguration tendons, maximum cantilever bridge and into a state of total moments as wellas bridges and10years after displacement compared with the original design, and research across the floor under torsion beam on the long-term effects, validated method for loaddeflection control zero moment superiority.