Research On The Technology Of Strengthening Truss Combination Arch Bridge

The trussed combination arch bridge originated by our country in the 1980's is such a new type. Compared with other model bridge, it was simple and cost less, as well as benefits, so it had developed rapidly in the past 20 years. But many problems about this kind of bridge have arisen in recent years. For example, many cracks have been found at the intersections of the main trusses almost in all of these bridges, and some bridges even had been demolished, so it was necessary and exigent to investigate the damage reason of this kind of bridge. Especially in recent years more and more trussed combination arch bridges bring to enter the ranks of dangerous bridges, majority of traffics have been controlled, which limited the development of local transport. Clearly, such a timely manner to the critically dangerous trussed combination arch bridge maintenance has been reinforced and no delay now. However, the current traditional old bridge strengthening and maintenance methods of trussed combination arch bridge have played rather limited role in most cases. And research results in trussed combination arch bridge reinforcement are very few. With the in-depth study of energy-released method reinforcement technology and more successful bridge reinforcement uses, energy-released method reinforcement technology has been recognized by more and more people. So, it was of great significance to study energy-released method reinforcement technology.First, based on the first design and construction drawing,writer used finite element analysis software, establishing plane finite element model of Fade bridge in Guizhou province 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 and deficiencies appear in trussed combination arch bridge.And author proposed that reinforced truss bridge must change the structure of the bridge and carry out the system conversion in order to return to the traditional arch bridge.After that writer analyze the feasibility of the method and effectiveness.Second, through the test of reinforcement project Yuancun bridge,author comed to the feasibility of reinforcement scheme. It could be reached that Yuancun bridge can meet the Road -â… -strength requirements after been 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.Then, through the analysis to trussed combination arch bridge reinforced computing model and calculation method of energy-released method, the author comed to the conclusion that the overall effect of reinforcement was significant and it had slightly inadequate.On this basis and then on outher introduce Fade bridge's reinforced design and calculation methods. And writer introduced its main construction technology, and a summary and outlook.