Study On Tied-Arch Bridge Of Strengthening Design And Construction Control

With the development of economy,the application of arc bridge is gradually increasin g.In the design of tied arch bridge early designers pay attention to its carrying capacity and ignore the problems that the boom resulted in an accident.So this article combining with practical engineering,make an in-depth study.In this paper,the basic technical route to be adopted is "engineering investigation and analysis-structure analysis before reinforcement-proposing reinforcement scheme-model structure analysis after reinforcement-expert proof-construction reinforcement control analysis".The reinforcement design of the through arch bridge is analyzed.The main research work and achievements are as follows:(1)The finite element analysis of the bridge is carried outThe model is used to analyze the relationship between the arch rib,boom and tie rod under dead load and live load.Force situation.The axial force and bending moment of the boom under dead load are all larger,while the live load of the boom,its value are obviously smaller,about 10% of the dead load.(2)The influence of the new boom on the mechanical properties of the bridge is analyzedThe axial force and bending moment of the original boom,arch rib and tie bar during the construction of the new boom are studied.The unloading of the original boom force under constant load is uniform.The axial force and moment variation of the arch rib The axial force of the arch ribs in the vicinity of the arch foot is larger than that of the bridge,and the value of the span change is small,which decreases progressively from the two sides to the crosswise direction,at the same time,the boom bending moment generated mutations in contact with the tie bar.(3)The reinforcement effect of the new boom is compared and analyzedThrough the use of fiber grating sensing test technology,the internal force of the original boom under the action of the new boom is tested.The results shows that the new boom can effectively improve the force of the original boom.