Application Research Of Carbon Fiber Tendon Strengthening Method In The Reinforcement Of Masonry Arch Bridge

Masonry arch structure is widely used and built in our country, because ofmaterial savings, reasonable bearing structure, high space utilization and beautiful appearance, etc., and it plays a huge role for the protection and development of transport.With the rapid development of transport, traffic overloads increasingly demanding, led to the emergence of the disease of old masonry arch bridges, and increasing year by year, it affects the normal use of the bridge structures, and threaten the safety of the bridge, it also affects the development of transport in our country.In china, old dangerous masonryarch bridges are not only in a large number but also widely distributed. However, it will cost a lot to rebuild and the most difficult part is interrupt the traffic resulted from the difficult to build temporary road. Meanwhile, the selecting of building bridge are mostly rugged topography, and transportation functions, blocking does great harm to traffic communication. In inconvenient cases, applying technology to strengthen the carrying capacity of the bridge, promoting the capacity and extending its life, it could not only save money, but also have the potential risk disappeared, which is beneficial to the economic benefits.There are many methods commonly used to reinforce a masonry arch bridge, but most of them have some disadvantages, for example, the temperature shrinkage modulus of masonry materials and reinforcement materials(fiber cloth, steel plate) is very different, lead to the change of temperature shrinkage deformation out of sync, ithave an impact on the durability of the structure after reinforcement.To improve the bearing capacity of structure,themajority of current high-strength material in reinforcement methods is steel, but it is not only increase the weight, but also increased maintenance costs because of easy to rust corrosion, and in most cases it is still need to interrupt the traffic, so it's uneconomical and the social impact of large. Therefore, the development of a corrosion-resistant, high-strength, lightweight materials, and easy construction, economy, little impact on traffic reinforcement method is particularly important in the current.In recent years, in Europe, Japan and other developed countries, carbon fiber rods in the bridge reinforcement technology has been applied in-depth study by the relevant professionals, the American Society of Civil Engineers havedevelopedrelevant technical guidance, and provide technical guidance for the carbon fiber rods reinforced bridge technology.In this paper, based on the reinforcement of Puzigang Bridge by the method of carbon fiber tendon, for the technology deficiencies of our common masonry arch bridge reinforcement, refer to the research results of carbon fiber tendon strengthening method in the reinforcement of masonry arch bridge both here and abroad, based on the theoretical analysis of carbon fiber tendon strengthening method in the reinforcement of masonry arch bridge, analysis the structural stress characteristics of eccentric compression member, and calculating the stress situation of joint surface and the stress condition of bridge stage in consider ofthe feature of "secondaryload" of structure, find the calculation method of the bearing capacity of masonry arch after reinforcement, to calculate the composite structure stress by finite element method, and clarified the technical points of construction process, finally, evaluate the Puzigang bridge before and after reinforcement by based on rigidity characteristics and dynamic characteristics.