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

The trussed arch bridge is an arch bridge with the level trust truss bridge. Compared with other traditional truss bridge, it is light weight and cost less, as well as benefits, so it had developed rapidly in these years. However, the use of trussed arch bridge to promote the process discovered that the trussed arch bridge has been built at the foot lower boom with horizontal cracks and appeared rod tip chord nodes cracks ,Especially in the past 10 years , traffic volume and the proportion of large vehicles are arising, so it is the reason that truss vertical deformation of a large amount of contact and the beam horizontal, rod, plate vertical cracks appear, and even some bridges even had been demolished, Especially in recent years more and more trussed arch bridges bring to enter the ranks of dangerous bridges, majority of traffics have been controlled, which limited the development of local transport .majority of traffics have been controlled, which limited the development of local transport. Clearly, such a timely manner to the critically dangerous trussed arch bridge maintenance has been reinforcement of no delay now. However, the current traditional old bridge strengthening and maintenance methods of trussed arch bridge have played rather limited role in most cases. And research results in trussed 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 MIDAS/Civil7.0.0 analysis software, establishing plane finite element model of Niu bixi 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 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 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 arch bridge , this paper put forward energy-released method reinforcement ideas and plans that if we want to reinforce trussed 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 arch bridge.Then, through the analysis to trussed 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 Niu bixi 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 . At the same time in order to assess the reinforcing effect of the bridge, clear the actual carrying capacity of bridges to ensure the normal operation of a bridge safety, as the bridge of the operation and management to provide technical basis, the Highway Bureau of Guizhou Province commissioned Shanghai Tongji Construction engineering quality inspection stations and Guizhou highway road test Detect technology limited liability company carry out an assessment on the load-bearing capacity of the reinforced bridge. During the static load tests of the reinforced Niu bixi bridge, according with the requirements of efficiency in static load test and the main control section of the design of internal forces, it come to: the reinforced Niu bixi bridge in energy-released method is able to meet the road-â…¡class strength requirements, and security reserve are larger ; the main arch ring stiffness can meet the design requirements for reinforcement, the structure of the actual resistance is greater than the design requirements with the theoretical values; the control structure after unloading load relative residual strain and relative residual deflection are the requirements to meet the order. And it is proved once again that the consolidation that trussed arch bridge reinforced by energy-released method is feasible.