Research Of The Prestressed Concrete Bridge

Due to the impact of structural weight, vehicle load, impact load, fatigue, temperature and the environmental effects of concrete carbonization, chloride ion penetration as well as the material damage of concrete cracking and so on, it is difficult for the prestressed concrete bridge to avoid the emergence of many durability problems, which not only affect the normal use of the bridge structure, but also bring a series of security risks.Based on the research status at home and abroad, combined with the service environmental features about prestressed concrete bridge on the Henan area, the main durability diseases and its influence factors can be analyzed, and the applied calculation methods of structural resistance deterioration performance are derived from the probability theory, the electrochemical theory as well as the time-variant-reliability theory comprehensively, meanwhile, the bearing capacity evaluation system of prestressed concrete bridge will be established eventually. The main contents in this paper are as follows:(1) The research status at home and abroad is elaborated systematically, and the problems existing in the current study are showed.(2) According to the usage of the bridges on the Henan area, the durability diseases are classified, the main factors can be confirmed and analyzed, which provide a basis for inferring the material degradation and deformation mechanism model next chapters.(3) Combined with the detection result in Henan, the laws of concrete carbonization, steel bar corrosion and chloride diffusion which are suitable for this service environment are studied by introducing time parameter on the basis of existing degradation rule research of reinforced concrete material.(4) On the basis of existing evolution rule of bearing capacity, considering the stochastic nature of the load effect and structural resistance, the time-varying regularity of the bridge structure resistance will be analyzed combined with the specification for inspection and evaluation of load-bearing capacity of highway bridges; typical time-varying system reliability evaluation model of the prestressed concrete bridge is established and used to a project.