Research On The Technology Of Trussed Combination Arch Bridge Strengthened By Energy-released Method

The trussed combination arch bridge originated by our country in the 1980's is such a new type. Compared with traditional truss bridge, it is 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 is 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 reinforcement of 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 is of great significance to study energy-released method reinforcement technology.First, based on the first design and construction drawing, using Dr. bridge plane finite element analysis software, establishing plane finite element model of Yuancun 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 are the type of the bridge system itself birth defects, excessive pursuit of technical indicators for the economy, these caused many cases of partial bridge collapse component strength can not meet the requirements of design, safety reserves low, structure durability poor.Second, through thinking of traditional trussed combination arch bridge reinforcement methods, and combining the reinforcement mechanics to arch bridges of "energy-released method" and the main diseases and deficiencies causes of trussed combination arch bridge , this paper put forward energy-released method reinforcement ideas and plans that if we want to reinforce trussed combination arch bridge effectively, we must start with the structure, change system conversion, and then make it return to traditional arch bridge. Also, this paper analyzed the feasibility of using energy-released method to reinforce trussed combination arch bridge.Then, through the analysis to trussed combination arch bridge reinforced computing model and calculation method of energy-released method, the author given the suitable reinforced model, method and principle, and its reinforcement technology ways and construction technology were analyzed.Lastly, the author took Yuancun bridge's reinforcement for application example, established reinforced plane and finite element model of energy-released method, and analyzed its static and dynamic performances for a practice example .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. And it is proved once again that the consolidation that trussed combination arch bridge reinforced by energy-released method is feasible.