Study On Reinforcement Method Of Reinforced Concrete Box Arch Bridge

The reinforced concrete box arch bridge is affected by the structure itself and the external environment.As the use time increases,the disease also increases.In order to avoid the waste caused by the demolition and reconstruction,it is necessary to accurately and effectively strengthen the bridge to improve the bearing capacity of the bridge.And durability,to eliminate the safety hazards of the bridge,to ensure the normal operation of the bridge,so the study of the reinforcement method of the bridge is of great significance.In this paper,taking the Fusong Changsha Bridge reinforcement project as an example,the bridge is visually inspected before reinforcement,and the disease status of the arch bridge is assessed.According to the assessment results of the bridge disease condition and the structural stress characteristics of the arch bridge,it is proposed to use the steel plate attached to the lower edge of the arch box to reinforce the second to fourth arch of the arch bridge,and the arched foot is strengthened by the enlarged section method.The straddle and the fifth span are reinforced by the reinforcement method of the enlarged section method.The finite element model of the Fusui Changsha Bridge is established by Midas/Civil finite element software for analysis.Finally,the reinforcement method is used according to the proposed reinforcement method and the inspection results show that:After the reinforcement is completed,the check coefficient(?)values of the fourth span and the fifth span are both less than 1 and the rsidual strain is less than 20%,which satisfies the bearing capacity requirement of the bridge;the vertical maximum amplitude of the bridge after reinforcement is within the specification limit,and the verification is verified.The effectiveness of the secondary reinforcement schemeThe research results of this paper provide some reference to the design of reinforced concrete box arch bridge reinforcement.