Research On Prevention And Control Of Bump At Bridgehead And High-ductile Fiber-reinforced Concrete-based Continuous Durable Bridgehead Connection Mechanism

China is in the term of high-speed highway construction. Because of uneven settlement of the abutment back and other structures, the highway bridge junction damage occurs, resulting in the growing phenomenon of bridgehead bump. Bridgehead bump not only affects the access speed of the vehicle and traffic safety, but also vehicles the operating costs and road maintenance costs to some extent. At the same time, it reduces the service life of roads and bridges, the harm is very serious. Therefore, many scholars and experts have conducted the related investigations and propose a variety of technologies and measures to resolve bridgehead bump problems, and achieving some results. However, there are still many defects and shortcomings. For nearly a decade, a new type of concrete materials-Engineered Cementitious Composite (ECC), this new material has superior tensile, tensile strength and the outstanding durability and persistence. In view of this, the thesis discusses how to use high-ductile fiber-reinforced concrete to design Continuous seamless bridgehead connecting plate to meet the needs of various deformations.ECC material applied to the seamless bridgehead connecting plate, gives full play to the high ductility of ECC, reduces the cracks and deformations of bridge, improves the life of bridge, and be able to solve the bump prevention issues, and has a good economic and social benefits.This thesis is a brief analysis of the main technical problem of the traditional prevention bridgehead bump measures, mechanism of action and measures there are shortcomings and deficiencies; studying the mechanical properties, durability and sustainability of ECC materials; based on the analysis of the two parts, studying the structural design and calculation methods of ECC seamless bridgehead connecting plate, and proposing some comments and suggestions about the design of ECC material to solve bridgehead bump.The using of ECC seamless bridgehead connecting plates can effectively improve the continuity and smoothness of the bridge, reduce the bumps and let vehicles run more smoothly. At the same time, it can not only increase the life of bridges, but also improve the safety and service life of vehicles. Therefore, the application of ECC seamless bridgehead connecting plates to preventing bridgehead bump is necessary and helpful for facilitating resolving this problem.