Application And Research On Reinforcement Technology Of Rigid Frame Arch Bridge

Along with the rapid development of economy,the road traffic volume and vehicle load increasing,a large number of existing bridges have been damaged in different degrees,which has become a potential risk for the development of transportation.With its beautiful appearance,cost and the maintenance cost low,rigid frame arch bridge is widely used.However,due to the long construction time and its poor stability,potential bearing limitations,large amount of disease of rigid frame arch bridge appear in the use phase.How to transform and reinforce the rigid frame arch bridge with safety hidden danger has been imminent.The main work and research contents in this paper are as follows:(1)In this thesis,analyzing the structural composition and mechanical characteristics of rigid frame arch bridge,the characteristics of typical diseases are analyzed and summarized,and the causes of the disease of rigid frame arch bridge are analyzed and studied deeply.(2)It introduced some common methods of reinforcement of old bridge.and compared and analyzed the bridge structure reinforcement methods to clarify the advantages and disadvantages of each method and its application range.Focus on the strengthening of the comprehensive method,achieve a better strengthening effect.The feasibility of strengthening the application of each reinforcement method in rigid frame arch bridge is discussed in this paper.(3)In this paper,combining with the same span,the upper structure and the independent force system of a three rigid frame arch bridge reinforcement engineering examples,according to its own structure of the rigid frame arch bridge stress characteristics,disease detection analysis and evaluation results,in view of the problem of large number of cracks and poor integrity of the bridge in the middle of the real abdominal section during operation,puting forward strengthening the bearing capacity and adding transverse beam connections to the bottom of the solid abdominal section to enhance the bearing capacity and to add the transverse beam connecting as a whole.(4)Using structural finite element analysis software,calculate the reinforcement of structure before and after the key section resistance and stress,through comparative analysis of the applicability and to determine the reasonable reinforcement scheme to provide a guarantee,provides reference for the other same type bridges reinforcement.