Feasibility Study Of Prestressed Reinforcement Of Prestressed Concrete Truss Combination Arch Bridge

The bridge is Highway throat, reform and opening up, especially since the great development of national implementation of traffic and the western development policy, in particular the construction of the bridge span bridge construction has entered a golden era of rapid development, the land of China building a large number of novel structure, technical complexity, design and construction difficult, modern taste and high-tech long-span bridges. Among them, China’s first Truss Arch Bridge, the advantages of both arches and beams, spanning ability, reasonable force, light and beautiful, the provincial labor and materials, simple construction, is the most suitable for mountain reasonable one bridge.Faced with the need for modernization of the national economy, bridges and transportation fields are subject to challenge. Even the construction of the bridge’s not long, because of the design, construction and use of the existing problems, the original bridge defect exists, the role of long-term impact load, traffic volume and the apparent increase in vehicle load factors such as Truss Arch Bridge in Guizhou Province adopt more of a bridge, in Guizhou province’s economic development has made tremendous contributions, but in recent years there have been varying degrees of disease, and even endanger the normal use of the bridge, such as to put into use in recent years of Guizhou Renhuai Yanjin River Bridge, the bridge currently exists on the bottom chord, webs cracking, bridge vibration and abnormal phenomena. Thus, it is very important for Truss Arch Bridge Reinforcement research. Sponsored by the West Transportation Construction Technology Project:"Study for Damage causes and Strengthening method of the combined truss arch bridge "(No.2005318000017), a comprehensive theoretical research on the reinforcement in Prestressed Concrete Truss Arch Bridge is conducted, and the project application was constructed subsequently. The main research contents and results are as follows:1. Bridge reinforcement is generally through the reinforcement and structural components to improve the performance to restore or increase the carrying capacity of the bridge and crack resistance, in order to extend the useful life of the bridge structure to meet the requirements of modern transportation. Its reinforcement methods include increasing section reinforcement method, displacement method of concrete reinforcement, bonded steel reinforcement method, external prestressing reinforcement method, paste fiber composite reinforcement method and changing the structural system strengthening hair and so on. From reinforcement principle, scope, technical characteristics, material requirements and construction methods, these kinds of methods to analyze and evaluate bridge reinforcement.2. Due to the typical Truss Arch Bridges and different characteristics, mechanical characteristics are different, so the feasibility of its prestressed reinforcement will also not the same, the following will combine the various components of disease conditions, force structure characteristics and prestressed reinforcement characteristics of each of the major components, respectively prestressed reinforcement technology feasibility.3. On the road to the yellow of a Truss Arch relying on the structural analysis of prestressed reinforcement method of analytic geometry difficult to adopt a common simple method has broad applicability of computational methods and results of the analysis. Given that the existing Truss Arch Bridge in design methods, structural system, the specific structure with a high degree of similarity, so based on the analysis of specific examples of research results to other Truss Arch Bridge will also be of great significance.