Research On The Technology Of Trussed Combination Arch Bridge Strengthened By Cable-stayed Method

The trussed combination arch bridge is a arch bridge with a horizontal thrust and it first appeared in 1981,changyan bridge in Guizhou.Such bridges are a good combination of the arch brigde and truss bridege of advantage of their force, and it is a suitable bridge form of a wide range.But in the new century,as the rapid growth of the traffic volume,many problems about this kind of brideg have arisen in recent years.So it was very necessary and exigent to reinforce and repair these dying trussed combination arch bridge.First,based on the first design and construction drawing,using Dr.bridge to establish the mode of Fade bridge to simulate the construction process,and through static analysis under constant load,the live load and load combinations,the author reached the result that the main reasons why diseases.Second,through thinking of traditional trussed combination arch bridge reinforcement methods,the author proposed that reinforced truss bridge must change the structure of the bridge and carry out the system conversion.Learning from the design of cable-stayed arch,tension the cable on the basis of the original structure to form the combination of cable-arch structure with the original structure,so the old bridge is converted to cable-arch system,and the cable is to enhance the rigidity of the original bridge to achieve the purpose of improving the structural capacity.Finally, the author took Fade bridge's reinforcement for application examle, established the finite element model that reinforced by cables,and analyzed its static and dynamic performance.It could be reached that Fade bridge can meet the road-Ⅱstrength requirements after being reinforced,and it has greater safety reserves.Also, the vibration frequency bands reinforcement than before,the whole bridge has increased stiffness,reinforced significantly,improved dynamic performance.The results showed that:the active reinforcement method of cable-stayed is a simple,practical and safer design,and it has the definite theoretical significance and engineering practical value.